GMRT Synthesis: News

This page provides news announcements and data updates related to the Global Multi-Resolution Topography (GMRT) Synthesis.


May 2024

GMRT version 4.2.1 was released with data from 34 additional surveys conducted in the Atlantic Ocean (14 cruises), Pacific Ocean (14 cruises), Southern Ocean (3 cruises), and Indian Ocean (4 cruises). New data were acquired with research vessels Atlantis ( AT37-07, AT39-01, AT50-09A, and AT50-09BC), Falkor (FK210726_EM302 and FK210726_EM710), Falkor (too) ( FKt230812_EM124 and FKt230812_EM712), Fugro Discovery (FD170001 and FD201016), Fugro Gauss (FGS20220923), Gaia Blu (Jamme_Gaia22, Jamme_Gaia22_EM2040, and Jamme_Gaia22_EM712), Marcus G. Langseth (MGL2304), Maria S. Merian (MSM114-2), Meteor (M29-1 and M33L1), Nathaniel B. Palmer (NBP1706), Neil Armstrong (AR1-03_EM122, AR1-03_EM710, AR47, and AR64-02), Pressure Drop (PD19ST04), Roger Revelle (RR1202, RR1309, RR1412, and RR1709), Ronald H. Brown (RB-19-07, RB-20-01_Leg_1, and RB-20-02), and Thomas G. Thompson (TN319, TN354, and TN373).


November 2023

GMRT version 4.2 was released with an updated basemap and is now using the GEBCO 2023 bathymetry grid. Processed data from 30 additional multibeam surveys conducted in the Atlantic Ocean (11 cruises), Pacific Ocean (15 cruises), Southern Ocean (2 cruises), and Indian Ocean (6 cruises) were added to this release. New data were acquired with vessels Akademik Nikolaj Strakhov (STRAK-18), Atlantis (AT37-05, AT40-02, and AT40-03), James Cook (JC133), Knorr (KN158-04), Marcus G. Langseth (MGL1602), Melville (MV1304), OceanXplorer (OXR20220802, OXR20220802_EM712, OXR20220912, and OXR20220912_EM712), Okeanos Explorer (EX2000 and EX2103), Pelagia (64PE395), Pressure Drop (PD19DZ01, PD19DZ02, and PD19TT01), Roger Revelle (RR1319, RR1511, and RR1515), Ronald H. Brown (RB1704), Saildrone Surveyor (SD1200-0012-13), Sally Ride (SR1906 and SR1908), Sikuliaq (SKQ201402S, SKQ201714T, SKQ201822S, and SKQ201920S), and Thomas G. Thompson (TN377). These data bring the total area mapped at roughly 100m resolution within the multibeam component of GMRT to 10.98%. Additional gridded data products that provide detailed ocean bathymetry in GMRT v4.2 include: Ohana_Laske - a compilation of data from the Pacific Ocean (Blackman and Laske), Satellite Derived Bathymetry from the Bahamas (TCARTA), a compilation of data from the Southwest Indian Ridge (Hosford Scheirer), and the Portuguese Seamap 2030 multi-resolution compilation from the Atlantic Ocean.

March 2023

GMRT version 4.1.1 was released with data from 39 additional surveys conducted in the Atlantic Ocean (14 surveys), Pacific Ocean (21 surveys), Southern Ocean (1 survey), and Indian Ocean (5 surveys). New data were acquired with research vessels Falkor ( FK141109, FK170825, FK190315, FK190612, FK190612_EM710, FK200110, FK200110_EM710, FK200930, FK201228, FK210409, FK210409_EM710, FK210922, and FK210922_EM710), Hesperides (HE102_EM1002), James Cook (JC102, JC109, JC132, and JC169), Knorr (KN147-02, KN151-02, and KN221-02), Marcus G. Langseth (MGL1306), Nautilus (NA136, NA138, NA139, NA140, and NA143), Neil Armstrong (AR30-01), Okeanos Explorer (EX1905L1), Pourquoi Pas? (PP0722T), Roger Revelle (KNOX20RR, RR1317, and RR1807), Ronald H. Brown (RB1701 and RB-19-02), Sally Ride (SR1916), Sikuliaq (SKQ201919S), Sonne (SO293), and Thomas G. Thompson (TN323).


October 2022

GMRT version 4.1 was released with an updated basemap and is now using the GEBCO 2022 grid. This release includes the integration of several additional contributed bathymetry grids, including the Marmara Sea, the Southwest Indian Ocean Bathymetric Compilation (swIOBC).

Curated multibeam data from 61 additional cruises was also integrated, bringing the area mapped in the curated multibeam component of GMRT to 10.54% of the ocean. This includes data from cruises conducted in the Atlantic Ocean (12 cruises), Pacific Ocean (32 cruises), Arctic Ocean (1 cruise), and Indian Ocean (16 cruises). New data were acquired with research vessels Atlantis (AT39-06), Falkor (FK171005 and FK200802), Fugro Brasilis (FB210202 and KR-OER-19-01), Fugro Equator (EQT201114), Fugro Gauss (FG210025, FG210026, FG210027, FG210028, FG210029, and FG210030), Fugro Searcher (FS201119), Fugro Supporter (FSPR210028, FSPR210029, and FSPR210030), Knorr (KN199-02), Marcus G. Langseth (MGL2202), Melville (MV1306), NOAA Ship Ronald Brown (RB-18-04), Pressure Drop (PD18PR02, PD18PR03, PD18PR04, PD19BT01, PD19BT02, PD19JT02, PD19JT03, PD19MT02, PD19MT03, PD19PT01, PD19PT02, PD19SL01, PD19SL02, PD19T101, PD19T201, PD19T501, PD19TT02, PD19TT03, PD19YT01, PD19YT02, PD20AL01, PD20AL03, PD20BH01, PD20IB02, PD20IB03, PD20JT01, PD20KK01, PD20MT01, PD20MT03, PD20MT05, PD20MT06, PD20PA01, PD20PA02, PD20PT01, and PD20YT01), Roger Revelle (RR1315 and RR1405), Sally Ride (SR1913 and SR1914), and Thomas G. Thompson (TN320 and TN362).

Three presentations featuring GMRT were presented at the 2022 Map the Gaps GEBCO Bathymetry Symposium. This included an oral presentation about the GMRT-AusSeabed collaboration, and two posters that highlighted efforts to engage divers early-career students and researchers in ocean mapping:

July 2022

A presentation about GMRT (Ferrini et al, 2022) was made at the Seabed 2030 Regional Community Meeting for the South and West Pacific Oceans.

March 2022

A wiki page was established to provide tools and information for using the GMRT-Tiler code to grid, review and assess multibeam data. This code can be used in conjunction with MBSystem and GeoMapApp to tile and review gridded raster data generated from any MB-System compliant swath file (including GSF files generated with software such as Qimera or Caris. This tool is currently in use aboard the E/V Nautilus as part of their at-sea data processing standard operating procedures and accelerates the ingestion of new data into GMRT.

February 2022

A presentation (Drennon et al., 2022) utilizing the GMRT-Tiler approach to review and correct sound speed artifacts in processed multibeam data was presented at the Ocean Sciences Meeting. A video of this presentation can be viewed here.

January 2022

GMRT version 4.0 was released with a major update to the low resolution ocean basemap. GMRT now uses the GEBCO 2021 as its ocean basemap which increases the resolution of the basemap from 30 arcseconds (~1km, GEBCO 2014) to 15 arcseconds (~400m).

Curated multibeam data from 87 additional cruises was also added to the GMRT 4.0 release, bringing the area mapped in the multibeam component of GMRT to 10.3% of the ocean. These data were processed by the GMRT team and by other members of the global mapping community, and full attribution of their efforts is provided in the GMRT metadata. These data are global in extent and were conducted in the Atlantic Ocean (25 cruises), Pacific Ocean (37 cruises), Southern Ocean (3 cruises), and Indian Ocean (19 cruises). New data were acquired with research vessels Atlantis (AT37-01), Falkor (FK180722 , FK181005 , FK190529 , FK190831 , FK191120 , FK191229 , and FK200126), Fugro Brasilis (FB191023 , FB201027 , and FB210126), Fugro Equator (EQT190009 and EQT190014), Fugro Gauss (FG190001 , FG200010 , FG200325 , and FG200327), Fugro Searcher (FS180003 and FS200206), Fugro Supporter (FSP200208 , FSP200314 , FSP200507 , FSP200523 , FSP200605 , FSP200608 , FSP200716 , FSP201204 , and FSP201219), James Cook (JC066 and JC215), Kilo Moana (KM1021 , KM1128 , KM1312 , KM1517 , and KM1922), Marcus G. Langseth (MGL2104), Meteor (M32-1 , M32-5 , M32-6 , and M33-2), Nathaniel B. Palmer (NBP1707 , NBP1801 , NBP1802 , and NBP1902), Nautilus (NA072 , NA073 , NA074 , NA075 , NA076 , NA077 , NA078 , NA126 , NA127 , NA128 , NA130 , NA132 , NA133 , NA134 , and NA135), Okeanos Explorer (EX1805 , EX1806 , and EX1902), Pressure Drop (PD19PR01 , PD19T401 , PD20AL02 , PD20AT01 , PD20AT02 , PD20CD02 , PD20CR01 , PD20CR02 , PD20RS01 , PD20RS02 , PD20RS03 , PD20RS05 , PD20RS06 , PD20T101 , PD20T201 , and PD20T401), Roger Revelle (RR1201), Ronald H. Brown (RB-18-03), Sally Ride (SR1806 , SR1910 , and SR1912), Sikuliaq (SKQ201922T), and Thomas G. Thompson (TN358 , TN359 , and TN365).


March 2021

GMRT version 3.9 was released with data from 47 additional cruises conducted in the Atlantic Ocean (29 cruises), Pacific Ocean (16 cruises), Southern Ocean (2 cruises) and Indian Ocean (3 cruises). New data were acquired with research vessels Atlantis ( AT39-05, AT39-03, AT39-02A) Celtic Explorer ( CE16007, CE15, CE16014) Falkor (FK200308, FK181031, FK141215, FK200429) Fugro Brasilis (FB190002) Fugro Discovery (FD180004, FD180001) Fugro Equator (EQT190008) Fugro Gauss (FG190004, FG190005, FG190008, FG190006, FG190002, FG190009, FG190007, FG190003) Fugro Searcher (FS190005, FS190004) Fugro Supporter (FSP200007, FSP190006, FSPT180001, FSP190005) Kilo Moana (KM1921, KM1923) Knorr (KN195-09) Marcus G. Langseth (MGL1302, MGL1707) Melville (MV1218, MV1204) Nathaniel B. Palmer ( NBP1808) Nautilus ( NA125, NA124, NA122, NA121, NA119) Neil Armstrong (AR1-05, AR12, AR9-03, AR7-01) Roger Revelle (RR1510), and Sonne (SO259-2). The 2020 EMODnet Bathymetry DTM was included in GMRT v3.9.

February 2021

GMRT and Nippon Foundation - GEBCO Seabed 2030 Project entered into an agreement formalizing their relationship. GMRT has been contributed to the GEBCO grid since 2015 and is committed to working with international partners to complete a global ocean map.


December 2020

A presentation was made at Fall AGU about results from initial testing of the distributable GMRT Gridding/Tiling Code: "Initial Efforts Toward Coordinated Community Data Processing to Accelerate the Growth of Publicly Available Bathymetric Data Products" (Ferrini et al., 2020)

September 2020

GMRT version 3.8 was released with data from 84 additional cruises conducted in the Southern Ocean, Atlantic Ocean, Indian Ocean, and Pacific Ocean. New data were acquired with research vessels Falkor (FK161010, FK160320, FK190211, FK190106, FK190726, FK181210) Fugro Americas (FA170009, FA150002, FA160006, FA160004, FA170008, FA150001, FA160005) Fugro Brasilis (FB180001) Fugro Discovery (FD190006) James Cook (JC149) Kilo Moana (KM1807, KM1908) Knorr (KN162-12, KN197-10, KN210-01, KN197-08, KN195-08, KN197-05, KN210-03, KN192-04, KN192-03, KN194-02, KN195-11, KN196-03) Marcus G. Langseth (MGL1108, MGL1109) Maria S. Merian (MSM82-2, MSM79-2) Maurice Ewing (EW9205) Melville (MV1313, MGLN27MV, MGLN32MV, TUIM08MV) Nathaniel B. Palmer (NBP1704, NBP1603, NBP1403, NBP1602, NBP1608) Nautilus (NA102, NA104, NA093, NA097, NA079, NA080, NA082, NA100, NA099, NA101, NA083, NA089, NA090, NA088, NA105, NA106, NA108, NA109, NA110, NA114, NA115, NA116, NA117, NA087, NA092, NA103, NA107, NA112) Okeanos Explorer (EX1810) Roger Revelle (RR1610, ZHNG04RR, ZHNG09RR, RR1407, ZHNG07RR, RR1316, RR1117) Sonne (SO267-2, SO259-3, SO268-3), and Thomas G. Thompson (TN214).

GMRT tools for QA/QC of multibeam data were successfully deployed on the Ocean Exploration Trust's E/V Nautilus. This was a proof of concept deployment and has the goal of distributing the QA/QC work in order to accelerate the pace of integrating data into GMRT. The tools are now integrated as part of the onboard standard operating procedures and will expedite data integration while ensuring an extra level of QA/QC before the data are contributed to the NOAA NCEI archive. Efforts are ongoing to fully document these tools to make them easily distributable to anyone in the community.

August 2020

The Amazon Web Services deployment of GMRT was redesigned and launched to improve performance of GMRT services.

July 2020

GMRT was highlighted in a Story Map put together at Lamont-Doherty Earth Observatory as part of the celebration of Marie Tharp's 100th Birthday.

January 2020

GMRT contributed the curated multibeam data component of the synthesis version 3.7 for inclusion in the GEBCO 2020 grid in support of The Nippon Foundation - GEBCO Seabed 2030 Project.


October 2019

GMRT version 3.7 was released with data from 62 additional cruises conducted in the Southern Ocean (10 cruises), Atlantic Ocean (25 cruises), Indian Ocean (7 cruises), Arctic Ocean (4 cruises),and Pacific Ocean (17 cruises). These cruises included several community study areas: MAR (4 cruises), Lau (1 cruise), Gulf of California (2 cruises), New Zealand (3 cruises), Eastern North American Margin (8 cruises), Alaska:Aleutians (2 cruises), Cascadia (2 cruises). New data were acquired with research vessels: Atlantis (AT15-54, AT30-03) Charles Darwin (CD87) Falkor (FK180528, FK180119, FK180731, FK170124) Healy (HLY-05-Te, HLY-05-01, HLY-05-02, HLY-04-Tg, HLY-00-01) Kilo Moana (KM0412) Knorr (KN197-06, KN192-02, KN145-12, KN223, KN210-04, KN166-11, KN162-19, KN145-04, KN196-02, KN213-03, KN191, KN213-02, KN210-02, KN203-04, KN221-03) Marcus G. Langseth (MGL1907, MGL1903) Maurice Ewing (EW9106, EW9308, EW0113) Melville (MV1101, MV1112) Nathaniel B. Palmer (NBP1408, NBP1610, NBP1502, NBP1508, NBP1310, NBP1511, NBP1609, NBP0304A, NBP1501, NBP1701) Neil Armstrong (AR7-02, AR23-01, AR23-02) Okeanos Explorer (EX1502L3, EX1804, EX1803, EX1812, EX1807, EX1811, EX1711, EX1802, EX1710) Roger Revelle (RR1508, RR1513, AMAT01RR, AMAT02RR), and Sikuliaq (SKQ201617S).

A GMRT Webinar was held to describe the architecture and how the data synthesis is curated. A recording of it is available on YouTube.


December 2018

GMRT version 3.6 was released with data from 38 additional cruises conducted in the Southern Ocean (6 cruises), Atlantic Ocean (17 cruises), Indian Ocean (7 cruises), Pacific Ocean (15 cruises), MAR (2 cruises), Lau (2 cruises), IBM (1 cruise), Eastern North American Margin (7 cruises), Alaska:Aleutians (4 cruises). New data were acquired with research vessels Atlantis (AT26-30, AT07-15, AT26-29, AT21-05) Falkor (FK171110, FK150410, FK171224) Healy (HLY-03-Tc) Kilo Moana (KM0506, KM1811) Knorr (KN221-04, KN182-02, KN201, KN187-02) Marcus G. Langseth (MGL1305, MGL0903, MGL1110) Maurice Ewing (EW9401, EW9607) Melville (MV1111, MV1109) Nathaniel B. Palmer (NBP1406, NBP1503) Neil Armstrong (AR16) Roger Revelle (KNOX21RR, KNOX18RR, KNOX09RR, RR1413, KNOX15RR, GENE03RR, RR1009, RR1116, RR1404, RR1403, RR1105, RR1115), and Sikuliaq (SKQ201811S, SKQ201816S).

New gridded data in this release include the new 2018 EMODnet Bathymetry compilation, the new US Law of the Sea grids on the Atlantic Margin, and a gridded compilation from Alaska acquried with German research vessel Sonne and contributed by US investigators working in the region.

February 2018

GMRT version 3.5 was released with curated multibeam data from 33 additional cruises covering a total area of over 1 million square kilometers, and bringing the total number of cruises in GMRT to 1007. Data in this release are from the Southern Ocean (2 cruises), Atlantic Ocean (7 cruises), Indian Ocean (5 cruises), and Pacific Ocean (22 cruises) and add coverage to several community research focus sites including the Mid-Atlantic Ridge (1 cruise), Lau Back-arc Basin (1 cruise), Red Sea (1 cruise), Izu Bonin-Mariana arc (2 cruises), New Zealand (3 cruises), Eastern North American Margin (2 cruises), and Alaska:Aleutians (7 cruises), Cascadia (2 cruises), New data were acquired with research vessels Atlantis (AT30-01) Falkor (FK161229, FK160407, FK150728, FK151005) Healy (HLY17TA) Knorr (KN199-04, KN189-03) Marcus G. Langseth (MGL1601) Maurice Ewing (EW9202, EW9602) Melville (MV1309) Meteor (M116-1) Nathaniel B. Palmer (NBP1303) Robert D. Conrad (RC2704, RC2507, RC2705) Roger Revelle (KNOX07RR, RR1110, KNOX03RR) Ronald H. Brown (steppingstones2005), and Sonne (SO98-1, SO98-3, SO249-1, SO97-2, SO249-2, SO201-2, SO98-4, SO201-1b, SO97-1, SO96-2, SO96-1, SO98-2).

New gridded content in this release contributed by Australian colleagues includes high resolution data from the Great Barrier Reef, the Kerguelan Plateau, and coastal grids from New South Wales.

With this release, we have moved GMRT content to the Amazon cloud and anticipate improved performance for users. All GMRT services are now secure (https) making them more easily integrated into a variety of web applications.


October 2017

A new version of GMRT MapTool was released providing the ability to export grids from the GMRT South Polar and North Polar compilations. Users can now explore the the Polar versions of GMRT in a web browser, select an area of interest, and generate a GeoTIFF formatted grid file which can be imported into a variety of software platforms for additional analysis. The web services that drive these new components were also developed and published, and the code for the GMRT MapTool User Interface is now publicly available through GitHub.

July 2017

GMRT version 3.4 was released and includes new data from the Indian Ocean from the search for Malaysia Airlines flight MH370 (712,705 km2) as well as a new dataset from the Gulf of Mexico assembled from 3D seismic data by the US Bureau of Ocean Energy Management (207,622 km2). This release also includes data from 43 additional cruises, curated by the GMRT Team, covering 651,178 km2 of seafloor. These new data are from the Southern Ocean (1 cruise), Atlantic Ocean (10 cruises), Indian Ocean (1 cruise), and Pacific Ocean (36 cruises) and add new bathymetry data to several research focus sites: Juan de Fuca (1 cruise), Mid-Atlantic Ridge (2 cruises), Red Sea (1 cruise), Gulf of California (1 cruise), IBM (4 cruises), Eastern North American Margin (3 cruises), Alaska:Aleutians (22 cruises), Cascadia (3 cruises), East African Rift System (1 cruise), and Antarctica (1 cruise). New data were acquired with research vessels Atlantis (AT26-19) Davidson (B00153, B00142, B00149, B00141) Falkor (FK141015, FK151121, FK009B, FK161129, FK150117, FK160719, FK160115) Knorr (KN162-20) Marcus G. Langseth (MGL1309, MGL1512) Maurice Ewing (EW0106, EW9303) Melville (REM-02MV, MGLN38MV) Nathaniel B. Palmer (NBP1001, NBP1405) Robert D. Conrad (RC3001, RC2508) Roger Revelle (RR1111) Surveyor (B00108, B00156, B00155, B00154, B00152, B00151, B00150, B00148, B00147, B00146, B00145, B00144, B00143, B00140, B00113, B00111, B00110, B00106), and Thomas G. Thompson (TN278).

June 2017

In recognition of World Oceans Day, released an interactive Story Map about the GMRT Synthesis.

February 2017

GMRT version 3.3 was released on February 1 with data from 26 additional cruises conducted in the Southern Ocean (5 cruises), Atlantic Ocean (3 cruises), Indian Ocean (2 cruises), and Pacific Ocean (21 cruises) including 2 cruises from the Cascadia region. New data were acquired with research vessels: Atlantis (AT03-31, AT26-20, AT11-03) Falkor (FK150523); Kilo Moana (KM1520); Knorr (KN197-04); Melville (MV1010, MV1202, RSCN01MV); Nathaniel B. Palmer (NBP0607A, NBP1310B); Okeanos Explorer (EX1604, EX1605L2, EX1606); Robert D. Conrad (RC2509) Roger Revelle (ZHNG03RR, RR1310, DRFT08RR, RR1016, RR1109, RR1107, KNOX02RR, KIWI06RR) Sikuliaq (SKQ201401S), and Thomas G. Thompson (TN311, TN275).

This release also includes a rebuild of the North Polar basemap including the latest International Bathymetric Chart of the Arctic Ocean (IBCAO v 3.0) and a release of a new North Polar [WGS 84 / Arctic Polar Stereographic (EPSG:3995)] Web Map Service (WMS) [learn more].


June 2016

GMRT version 3.2 was released with data from 28 additional cruises conducted in the Southern Ocean (6 cruises), Atlantic Ocean (14 cruises), Indian Ocean (1 cruise), and Pacific Ocean (12 cruises). New data were acquired with research vessels Falkor (FK140625) Kilo Moana (KM0419) Knorr (KN195-05, KN161-07) Melville (MV1203, MV1102) Nathaniel B. Palmer (NBP1203, NBP1305, NBP1310A, NBP1304, NBP1302) Okeanos Explorer (EX1504L2, EX1504L1, EX1201, EX1402L3, EX1402L2, EX1504L4, EX1206, EX1502L2) Robert D. Conrad (RC3003, RC2907, RC2905, RC2710) Roger Revelle (AMAT03RR, RR1509), and Ronald H. Brown (RB0305, RB0303, RB0604).

This release also includes an update of the South Polar Basemap to use the International Bathymetric Chart of the Southern Ocean (IBCSO) 500 m resolution compilation.

January 2016

New Point and Profile Services that can be used to extract elevation values from GMRT are now available. These new services are integrated in the GMRT MapTool and are also available as web services.

GMRT Multibeam Data Reports, accessible through the contributors page, now include area mapped per cruise.

An article about GMRT was posted on the Columbia University Earth Institute's State of the Planet Blog.


December 2015

A new release of Google's Ocean Basemap includes updated content from GMRT. With this release, ~ 8% of the ocean is mapped at ~100m resolution in the GMRT synthesis.

November 2015

GMRT was added to as a basemap layer option in the NOAA NCEI Bathymetric Data Viewer.

GMRT version 3.1 was released with data from 31 additional cruises conducted in the Southern Ocean (2 cruises), Atlantic Ocean (5 cruises), Indian Ocean (2 cruises), and Pacific Ocean (20 cruises). This release includes new data in several community focus sites including: EPR:9N (1 cruise), Lau Basin (3 cruises) Central America (2 cruises), IBM (2 cruises), Alaska:Aleutians (1 cruise), and Cascadia (5 cruises). New data were acquired with 9 research vessels: Atlantis (AT26-18, AT26-23) Falkor (FK004E, FK006A, FK008, FK009A, FK010, FK150301, FK150324, FK006B, FK006C) Kilo Moana (KM0314, KM0405) Knorr (KN189-02) Melville (MGLN04MV, MGLN08MV, MGLN31MV) Nathaniel B. Palmer (NBP1202, NBP1201) Okeanos Explorer (EX1004, EX1404L1, EX1404L2, EX1404L3, EX1006, EX1106, EX1204) Roger Revelle (RR1313, ZHNG08RR, RR1005), and Thomas G. Thompson (TN313, TN177).

June 2015

GMRT version 3.0 was released and now include the GEBCO_2014 grid as its basemap which replaces the Smith and Sandwell compilation that was used in previous versions. The GEBCO_2014 basemap includes processed data from the GMRT Synthesis through version 2.5. This release also includes processed swath data from 38 additional cruises from 11 research vessels: Healy ( HLY-03-02, HLY-04-03) Kilo Moana ( KM0201, KM0310, KM0914, KM1130) Knorr ( KN188-01, KN188-02, KN203-02) Marcus G. Langseth ( MGL1113, MGL1206, MGL1216) Maurice Ewing ( EW9209, EW9504) Melville ( TUIM06MV, MGLN07MV, MGLN30MV, MV0911, MV1015) Oden ( OSO0910) Okeanos Explorer ( EX0904, EX0902, EX0903, EX0905, EX0907, EX0908, EX1005, EX1104, EX1203, EX1302, EX1303, EX1401, EX1402L1) Roger Revelle ( RR1006, RR1012) Thomas G. Thompson ( TN252, TN303), and Thomas Washington ( RNDB06WT). Additional data in this release include the Law of the Sea Mendocino Fracture Zone Compilation from UNH, a 50m resolution grid from the Sumatra acquired by the British Royal Navy, and high-resolution grids from the Indus Canyon and Indus Shelf.

May 2015

New GMRT Data Processing Report pages were launched and are accessible for each cruise through the GMRT Contributors page. These data processing report pages provide access to details about processing steps taken, links to Multibeam Quality Assessment Reports conducted on raw multibeam data by the R2R Program, and links to resources made available through the Multibeam Advisory Committee.


December 2014

Multibeam data cleaned and QC'd by the GMRT Team has been integrated into the newly released GEBCO_2014 30 arc-second bathymetric grid! The General Bathymetric Chart of the Oceans (GEBCO) is developed with contributions from an international community of experts who work to bring together worldwide bathymetric data to generate integrated products.

November 2014

GMRT version 2.7 was released with data from 29 additional cruises, adding more than 100,000 ship-track miles of data from throughout the global oceans. Multibeam data included in this release are from research cruises conducted in the Arctic Ocean (2 cruises), Southern Ocean (4 cruises), Atlantic Ocean (5 cruises), Indian Ocean (3 cruises), Pacific Ocean (22 cruises, including 8 in the Cascadia Focus area). New data were acquired with research vessels Atlantis (AT26-02, AT15-61) , Discoverer (DI-91-01, DI-92-02, DI-93-02, DI-87-02) , Falkor (FK140307, FK140502, FK007) , Healy (HLY-03-03, HLY-04-04) , Knorr (KN197-03) , Marcus G. Langseth (MGL1205, MGL1004) , Melville (MV1207) , Nathaniel B. Palmer (NBP1103, NBP1107), Okeanos Explorer (EX1403) , Roger Revelle (KNOX14RR, RR1004, RR1001, RR1013, KNOX04RR, RR1212, RR1008, RR1114, RR1002), and Thomas G. Thompson (TN312, TN283). This release also provides improved precision and resolution of gridded data sets contributed to the synthesis.

A new GMRT ImageServer was launched providing access to images from the GMRT Synthesis. Requested images may be up to 8000 pixels in either dimension and are returned as jpegs. More information about the service is available from the GMRT ImageServer documentation page.

October 2014

A new REST-like service for direct access to gridded data from the GMRT Synthesis was released enabling data requests of 2GB, or approximately 20 by 20 degrees at 100 meters per node (maximum available resolution). A variety of new output formats are supported including GeoTIFF. More information about the service is available from the GMRT GridServer documentation page.

May 2014

GMRT version 2.6 was released with data from 48 additional cruises conducted in the Arctic Ocean (1 cruise), Southern Ocean (3 cruises), Atlantic Ocean (5 cruises), Indian Ocean (3 cruises), Pacific Ocean (32 cruises). This release includes 7 new cruises in the Cascadia GeoPRISMS Focus Site, 2 within the Alaska:Aleutians Focus Site, and 4 within the Eastern North American Margin Focus Site. New data were acquired with research vessels Atlantis (AT18-03, AT22, AT15-42, AT15-31, AT15-26, AT15-36, AT15-51, AT15-44, AT15-39) Healy (HLY-02-02) James Clark Ross (JR141) Kilo Moana (KM1106, KM1121, KM1102, KM1006, KM1129, KM1115, KM1004) Knorr (KN209-01, KN207-02, KN210-05, KN204-02, KN207-01) Marcus G. Langseth (MGL0902, MGL1208, MGL0814, MGL1212, MGL0907, MGL0908, MGL0910) Melville (TUIM01MV, MV1001, MV1208, MGLN13MV, TUIM03MV, MGLN03MV) Nathaniel B. Palmer (NBP1210, NBP1101, NBP1005) Roger Revelle (KNOX13RR, KNOX10RR, KNOX12RR, RR1213, RR1007), and Thomas G. Thompson (TN271, TN254, TN282, TN274).

GMRT version 2.6 also includes significantly more gridded data sets contributed by international colleagues including the EMODnet bathymetric compilation, the Baltic Sea compilation, and several grids from the Pacific Islands Benthinc Habitat Mapping Center. Learn more...


October 2013

A new page describing addition details about the GMRT Synthesis and how data are prepared for inclusion was launched. The data contributors page was also revised with enhanced metadata and provenance information.

GMRT version 2.5 was released with data from 42 additional cruises contributing new data to the Southern Ocean (4 cruises), Atlantic Ocean (17 cruises), Indian Ocean (4 cruises), and Pacific Ocean (23 cruises). This release also includes data from 6 cruises in the GeoPRISMS Cascadia Focus Site. Data added in this release were acquired with research vessels Atlantis (AT15-24, AT21-04, AT26-04, AT15-21, AT21-03, AT20, AT21-02) Kilo Moana (KM1002, KM1005, KM1009, KM1007) Knorr (KN189-04, KN200-06, KN200-02, KN162-11, KN162-15, KN205, KN209-02) Marcus G. Langseth (MGL1212, MGL1115) Maurice Ewing (EW9008) Melville (MV1105, VANC07MV, MGLN44MV, MV1008, TUIM07MV, MV1110, MV1011, MV1103, MV1206, MV1014, MV1106, MV1104) Meteor (M31L3) Nathaniel B. Palmer (NBP1003, NBP1105, NBP1004) Okeanos Explorer (EX1103, EX1101) Robert D. Conrad (RC2806) Ronald H. Brown (RB0904), and Thomas G. Thompson (TN269).

April 2013

GMRT version 2.4 was released with data from 40 additional cruises conducted in the Atlantic Ocean (11 cruises), Indian Ocean (1 cruise), and Pacific Ocean (30 cruises), and including data from 11 cruises conducted in the GeoPRISMS Cascadia Focus Site. New data were acquired with research vessels Atlantis (AT18-15, AT18-09, AT18-16, AT18-12, AT18-13, AT21-01) Hesperides (HE102) Kilo Moana (KM0503, KM1008) Knorr (KN189-01, KN195-03, KN192-07, KN193-06, KN192-05) Marcus G. Langseth (MGL1211) Maurice Ewing (EW0410, EW9408) Melville (MV0906, MV1003, MV1016, MV0907, MV0905, MV1007) Roger Revelle (RR0915, RR1301, RR0912, RR0913, RR0907, RR0914, RR0917, RR0903, RR0916, RR0902, KIWI07RR), and Thomas G. Thompson (TN266, TN261, TN263, TN264, TN265, TN268).

February 2013

A new page listing known issues (e.g. bad depth values) in the GMRT compilation was launched. We are working toward addressing these issues in future releases of the compilation. Please contact us if you know of other issues.


October 2012

GMRT 2.3 released with data from 37 new cruises, bringing the total number of cruises in the compilation to 647. This release expands the 100-m resolution coverage primarily in the Pacific Ocean, with a focus on the GeoPRISMS Cascadia Focus Site. New data included are from research vessels Atlantis (AT18-08, AT03-23, AT03-38, AT11-07, AT15-41, AT15-45, AT18-07), Healy (HLY-07-Td, HLY-08-01, HLY-07-Th, HLY-07-Tc, HLY-07-01, HLY-06-Ti, HLY-06-Th, HLY-05-Tc, HLY-04-Tb), Kilo Moana (KM0514, KM0625), Marcus G. Langseth (MGL1214), Maurice Ewing (EW0002, EW9703, EW9304, EW0301, EW0112), Melville (MGLN46MV), Nathaniel B. Palmer (NBP0803, NBP0804), Ocean Alert (Tran2new), Robert D. Conrad (RC2607), Roger Revelle (HNRO07RR, KIWI10RR, KNOX05RR), Ronald H. Brown RB0002), Sonne (SO108), Thomas G. Thompson (TN267, TN253, TN279).

April 2012

GMRT 2.2 released with data from 41 new cruises, bringing the total number of cruises in the compilation to 610. This release focuses on expanding 100-m resolution coverage primarily in the Southern and Pacific Oceans. New data included are from the research vessels Atlantis (AT07-14), Kilo Moana (KM0612, KM0615, KM0620, KM0629, KM0631, KM0632, KM0703, KM0704, KM0710, KM0713, KM0718, KM0817, KM0908), Knorr (KN176-01, KN182-03, KN182-07), Melville (SOJN04MV,VANC06MV, VANC08MV), Roger Revelle (KNOX06RR), Marcus G. Langseth (MGL0808), Thomas G. Thompson (TN199), the Ice Breaker Nathaniel B. Palmer (NBP0501, NBP0506, NBP0507, NBP0607C, NBP0701, NBP0802, NBP0805, NBP0901, NBP0905A), and the USCGC Healy ( HLY-01-03, HLY-03-01, HLY-03-Td, HLY-04-01, HLY-04-Ta, HLY-04-Td, HLY-06-Td, HLY-06-Te, HLY-06-Tg).



September 2011

GMRT 2.1 released with data from 77 new cruises expanding 100-m resolution coverage in the oceans. This release focuses on regions of the Pacific, South Atlantic, and Southern Ocean. Several cruises were added in the GeoPRISMS Cascadia Focus Site to facilitate community efforts in that region. New data are included from the research vessels Atlantis (AT03-36, AT03-37, AT03-53, AT03-56, AT07-12, AT07-13, AT07-16, AT07-17, AT07-19, AT07-20, AT11-14, AT11-23, AT11-24, AT11-27, AT11-30, AT11-31, AT11-32), Robert Conrad (RC2501, RC2514, RC2610, RC2804), Discoverer (TOGA92T), Maurice Ewing (EW0008, EW0111, EW0305, EW0406, EW9004, EW9104, EW9302, EW9402, EW9709, EW9802, EW9803, EW9805, EW9806, EW9807, EW9808, EW9902), Healy (HLY-04-Tc, HLY-07-Ta), Kilo Moana (KM0202, KM0204, KM0409, KM0413, KM0415, KM0416, KM0624, KM0626, KM0630, KM0701, KM0706, KM0720, KM0819, KM0824, KM0911, KM0913), Knorr (KN182-05, KN182-08, KN182-09, KN182-10, KN182-11, KN182-12, KN182-13), Marcus G. Langseth (MGL0804, MGL0807), Melville (MGLN02MV, MGLN06MV), Nathaniel B. Palmer (NBP0101, NBP0407, NBP0908), Roger Revelle (LPRS02RR, SEAW03RR), Ronald H. Brown (RB9702-3) and Thomas G. Thompson (TN153, TN173, TN175, TN232).


June 2011

In recognition of World Oceans Day on June 8, the Global Multi-Resolution Topography Synthesis was published in Google Earth. Along with this publication, two Google Tours were released highlighting Seafloor Features and Ridge 2000 Science. The GMRT Synthesis would not be possible without the contributions of hundreds of scientists whose data has been made publicly available. The full GMRT attribution layer which provides links to source data can also be downloaded as a kmz file from the Google Earth Gallery.

January 2011

GMRT 2.0 released with greatly expanded coverage in the oceans, and the ASTER and NED topography datasets for the global land masses. The ASTER GDEM topography dataset (Japan METI/NASA), provides 30 m resolution for the continents from 83°S to 83°N and replaces the SRTM dataset used in earlier versions the GMRT. For North America, the even higher resolution NED dataset (USGS) is now used, providing topography of the continental U.S. to 10 m resolution.

For the oceans, the GMRT v2.0 synthesis includes bathymetric coverage to 100 m resolution from 492 multibeam bathymetry mapping expeditions and regional gridded compilations from a number of areas and international sources. New data coverage over GMRT 1.0 is focused in the Atlantic and central Pacific with over 100 expeditions added since the prior release. In addition, GMRT v2.0 includes a new 50 m grid resolution layer for the continental shelves and other ocean areas where native resolution of the available sonar data is sufficient. The high resolution bathymetry are merged with the Smith and Sandwell v12.1 global topography compilation, the IBCAO v2.23 for the Arctic, and the BedMap Subglacial Topographic Model of the Antarctic.



Stay tuned for GMRT version 2.0 to be released this fall! The new compilation includes several improvements including a revised tiling scheme enabling higher resolution ocean coverage where supported by the source data, improved quality, improved land resolution, extended swath coverage.



September/October 2009

Ingestion of Scripps multibeam data continued with several Pacific Ocean cruises added to the GMRT tileset.

  • CRGN04WT (Lonsdale, Hilo to Honolulu, marine geophysical work on the submerged section of Kilauea Volcano.)
  • DRFT09RR (Terrill, Lyttelton NZ to American Samoa, flow field around surface ships and their wakes)
  • DRFT16RR (Lonsdale, Honolulu to San Diego, transit and multibeam collection)
  • KRUS05RR (Baggeroer, Honolulu to Honolulu, low frequency acoustic propagation across margins and over seamounts)
  • KRUS06RR (Lonsdale, Honolulu to San Diego, multibeam collection)
  • LPRS04RR (Miller, Newport to Honolulu, transit)

June 2009

Multibeam data from these Southern Ocean cruises were added to the South Polar tileset.

  • NBP0304D (Cande, Wade and Stock, southwest Pacific reconstructions),
  • NBP0709 (Ackley, Punta Arenas, Chile - Palmer Station)
  • NBP0812 (Chereskin, Drake Passage current dynamics)

April 2009

Expanded download access through GeoMapApp to multibeam ping files at cruise data repositories.

March 2009

A paper describing the tiling method and procedures used for creating and serving the GMRT (Ryan et al., 2009) was published in Geochemistry, Geophysics, Geosystems.

January/February 2009

Our emphasis on ingesting Scripps data continued with 29 new cruises added to the GMRT tileset.

In the greater Pacific Ocean:
  • AVON10MV (Worcester, Eureka - San Francisco, array recovery)
  • COOK19MV (Coale, Lyttelton - Lyttelton, Southern Ocean Iron Enrichment)
  • CRGN01WT (Winterer, San Diego - Papeete, relation of SEASAT to basement topography)
  • CRGN02WT (Natland, Papeete - Papeete, study of the sea floor near the Marquesas)
  • CRGN05WT (Hussong, Honolulu - Honolulu, Physical Oceanography)
  • DRFT11RR (Miller, American Samoa - Hawaii, transit)
  • MRTN01WT (Smith, San Diego - Honolulu, organic carbon studies and seabeam surveys)
  • MRTN03WT (Ladd, Kodiak - Kodiak, geological structures of the inner slope of the Aleutian Trench)
  • MRTN04WT (Menard, Kodiak - Honolulu, geophysical survey)
  • MRTN15WT (Orcutt, Panama - San Diego, 2-ship crustal structure of the East Pacific Rise)
  • OXMZ01MV (VanGeen, San Diego - San Diego, Coring the Oxygen Minimum Zone off Baja)
  • PLUM02WT (Christie, Galapagos - Galapagos, Evolution of the Galapagos Hotspot)
  • PLUM03WT (Miller, Galapagos - Recife, transit)
  • RNDB01WT (Hildebrand, San Diego - Honolulu, Seabeam survey)
  • RNDB02WT (Detrick, Honolulu - Honolulu, Seismic profiling/SeaBeam in area 35N,133W)
  • RNDB03WT (Miller, Honolulu - Honolulu, transit)
  • RNDB05WT (Miller, Newport, Oregon - Dutch Harbor, transit)
  • RNDB12WT (Shipley, Majuro - Majuro, Marshall Islands, Seismic reflection and Sea Beam)
  • RNDB18WT (Lonsdale, San Diego - San Diego, Fieberling Guyot and multibeam survey)
  • SEAB0BWT (Mammerickx, San Diego - San Diego, multibeam seamount surveys)
In the South Atlantic Ocean:
  • MRTN07WT (Gordon, Mar Del Plata - Montevideo, Brazil and Falkland currents)
  • MRTN08WT (Roden, Montevideo - Montevideo, western boundary currents of the South Atlantic)
  • MRTN09WT (McCartney, Montevideo - Rio de Janeiro, Brazil and western boundary current)
  • PLUM07WT (Overpeck, Venezuela - Venezuela, sediments of the Cariaco Basin)
  • VANC04MV (Forsyth, Arica, Chile - Valparaiso, Volcanic Ridges and Cross-grain Gravity Lineations)
In the Indian Ocean and north of Australia:
  • VANC10MV (Blackman, Cape Town - Port Hedland, nuclear test monitoring research)
  • VANC11MV (Brink, Port Hedland - Darwin, CTD/Rosette work)
  • VANC16MV (Nittrouer, Papua New Guinea - Cairns, Biogeochemical cycling, instrument recoveries)
  • VANC30MV (Nittrouer, Papua New Guinea - Cairns, Fly River/Gulf of Papua Shelf)



December 2008

Multibeam data from the Southern Ocean cruises were added to the South Polar tileset.

  • NBP0401(Wilson, structure of Terror Rift, Western Ross Sea),
  • NBP0505 (Anderson, glacial sedimentation)
  • NBP0602 (Stock, McMurdo - Punta Arenas, Chile)
The tile updates in the Pacific Ocean continued with 27 new Scripps cruises added.
In the area of coastal California, and eastern Pacific:
  • 981107RR (Checkley, test/class cruise)
  • AVON11MV(Mercer, Pioneer seamount)
  • AVON12MV (Kastner, Gas Hydrates in the Eel River)
  • BONZ02WT (Lonsdale, seamounts)
  • CALF01RR (Hayward, fisheries ecology)
  • CALF03RR (Baldwin, California Current Investigations)
  • CNTL01RR (Miller, marine geophysics)
  • CORE01MV (Fryer, Geological Oceanography, Marine Geophysics)
  • GLOR00MV (DeMoustier, sea trials)
  • INSV01WT (transit, Instrumentation trials)
  • JNUS01WT (Spiess, Seafloor topography)
  • NALU01RR (Becker, Borehole Instrument testing)
  • NECR01RR (Spiess, Juan De Fuca Ridge geodesy)
  • PHNX04MV (DeMoustier, Equipment test)
  • REM-01MV (Spiess, Juan De Fuca Ridge geodesy)
  • REVT01RR (Sutherland, Instrumentation test)
  • VANC01MV (Klein, study of the Incipient Rift at 2.66N)
  • WEST00MV (Althouse, Equipment test)
  • WEST15MV (Cande, North Pacific Coast - Deep Tow and Seabeam)
In the central and western Pacific Ocean:
  • CNXO01WT (Serge, Papeete harbor survey)
  • CNTL09RR (Terrill, San Diego - Honolulu)
  • CNTL12RR (Porter, Physical and Geological Oceanography)
  • CNTL14RR (Miller, transit, Honolulu - Newport, Oregon)
  • KIWI14RR (DeMoustier, Honolulu - Honolulu)
  • TUNE04WT (Constable, Honolulu - Honolulu)
  • VANC29MV (Nittrouer, Fly River/Gulf of Papua Shelf)
  • WEST13MV (Coale, Papeete, Tahiti - Acapulco, Mexico)

November 2008

Multibeam data in several areas of the Pacific Ocean has been added to the tiles.

Data from Scripps in the vicinity of Hawaii:
  • DRFT12RR (Sutherland, Multibeam and gravity survey)
  • KIWI04RR (Lukas, Biological oceanography)
  • NECR04RR (Gregg, Physical oceanography)

Data from Scripps in the general region of Australia:
  • SOJN07MV (Exon, Hobart - Melbourne, Multibeam mapping)
  • VANC19MV (Ogston, Fly River/Gulf of Papua Shelf )
  • VANC20MV (Nittrouer, Fly River/Gulf of Papua Shelf)
  • VANC21MV (Nittrouer, Fly River/Gulf of Papua Shelf)
  • VANC22MV (Driscoll, clinoform formation, Gulf of Papua)
  • VANC23MV (Driscoll, clinoform formation, Gulf of Papua)
  • VANC27MV(Ogston, Fly River/Gulf of Papua Shelf)
  • VANC28MV (Nittrouer, Fly River/Gulf of Papua Shelf)
  • WEST11MV (Luther, Hobart - Hobart, to 54.5 S)
Trans-Pacific cruises from Scripps:
  • AVON07MV (Shipley, Tahiti - San Diego)
  • COOK21MV (Larson, W. Samoa - Marshall Is.)
  • COOK25MV (Villareal, Honolulu - San Diego)
  • TUNE09WT (Lonsdale, Marshall Islands - San Diego)
  • VANC33MV (Swift, Hawaii to San Diego, Physical oceanography)
Eastern Pacific Ocean cruises from Scripps:
  • ARIA01WT (Shipley, San Diego - Panama, drilling site surveys)
  • NEMO02MV (Fornari, Manzanillo - Manzanillo, EPR crest eruptions)
  • PACS03MV (Anderson, S., Pan-American Climate Physical oceanography)
  • REVT03RR (deMoustier, San Diego - San Diego)
  • TO9001WT (Brink, California mooring recovery)
  • TO9002WT (Eriksen, California mooring recovery)
  • WSFL01WT (Lonsdale, Westfall Seamount and Guadalupe Fracture Zone Survey)

October 2008

Tiles, predominately in the Pacific Ocean, were updated with Scripps multibeam data from the following cruises:

  • AVON06MV (Josep, Honolulu - Honolulu)
  • BMRG04MV (transit, New Zealand - Tasmania)
  • COOK03MV (Eakins, Chile - Tahiti, Bauer Scarp area survey)
  • COOK04MV (Larson, Tahiti - Samoa, Tongareva triple junction)
  • COOK09MV (Watts, R., Sea of Japan)
  • COOK12MV (Silver, Papua New Guinea - Papua New Guinea)
  • COOK14MV (Yayanos, Fiji - Samoa, Horizon Deep, Kermadec and Tonga Trenches)
  • COOK15MV (no PI, Samoa -Tahiti, Tongareva triple junction study)
  • COOK18MV (transit, Tahiti - New Zealand)
  • DANA03RR (Weller, Ecuador - Chile, mooring servicing)
  • DRFT02RR (Kennan, San Diego - Costa Rica, studies of the North Equatorial Counter Current)
  • GENE01RR (engineering test transit, San Diego - Peru)
  • GLOR06MV (Naar, Easter Island - Valparaiso, Easter Microplate and seamounts)
  • HNRO17RR (transit, Taiwan - Honolulu)
  • KIWI02RR (Stephen, San Francisco - Honolulu, bathymetry, reflection profiling and dredging)
  • NECR02RR (Gee, Astoria, Oregon - Honolulu, equipment testing)
  • NECR05RR (Hildebrand, Honolulu - Hilo, Hawaii, geodesic monitoring of Kilauea volcano)
  • PANR08MV (transit, Honolulu - San Diego)
  • REVT02RR (Rudnick, San Diego - San Diego, brief test trip)
  • TUIM02MV (transit, Honolulu - Tahiti)
  • TUNE01WT (Tsuchiya, San Diego - Tahiti, WOCE hydrographic program)
  • TUNE03WT (Talley, Tahiti - Honolulu, circulation of the Pacific Ocean)
  • VANC03MV (Weller, Costa Rica - Chile, service moorings)
  • VANC05MV (transit, Valparaiso - Cape Town, South Africa)

September 2008

Tiles in the Pacific region were updated with Scripps multibeam data from AVON03MV (Chief Scientists Hart and Staudigel, Samoa area), CNTL10RR (Luther, Hawaii vicinity), COOK17MV (Easter Island - Papeete, transit), COOK22MV (Rainville, Marshall Islands - Japan), COOK24MV (Repeta, Hawaii vicinity), LFEX01MV (Mercer, San Diego - Honolulu), KRUS01RR (Worcester, San Diego - Honolulu), and VANC02MV (Fisher, survey offshore Costa Rica).

July 2008

Tiles in the north polar region were updated with data from Charles Darwin CD87 (Chief Scientist Roger Searle), including a survey of Gakkel Ridge, and USCGC Healy HLY-03-02 (Chief Scientist Larry Mayer, Barrow - Barrow).

June 2008

GMRT bathymetry tiles were updated with swath data from NBP0702 (Chief Scientist S.Jacobs, Amundsen Continental Shelf and the Antarctic Ice Sheet, McMurdo - Chile), NBP0403 (Cande, Lyttelton, N.Z.-Punta Arenas, Chile), and NBP0301B (Walker Smith, McMurdo-McMurdo).

May 2008

Multibeam data from NBP0304 (Chief Scientist Cande, NZ-Dutch Harbor, Alaska), NBP0408 (Chief Scientist S. Jacobs, ANSLOPE Leg_III), NBP0602 (J.Stock, McMurdo - Punta Arenas, Chile), NBP0301B (Walker Smith, McMurdo-McMurdo), NBP0403 (Cande, Lyttelton, NZ - Punta Arenas, Chile) and NBP9504 (seabeam test, off New Zealand) were recently added to the Global Multi-Resolution Topography compilation.

April 2008

Multibeam bathymetry data from NBP0304C now added to the Global Multi-Resolution Topography compilation and accessible through GeoMapApp.

March 2008

Multibeam data from the following cruises added to the Global Multi-Resolution Topography compilation and accessible through GeoMapApp: NBP9601, NBP0207, NBP0209, NBP0405.

February 2008

NBP0305A multibeam data (Chief Scientist Walker Smith, New Zealand - McMurdo) was added to the Global Multi-Resolution Topography compilation and accessible through GeoMapApp.



December 2007

The multibeam data from Antarctic cruises NBP0506, contributed by Miles McPhee, which included data in the vicinity of the Maud Rise, and data from NBP0402 (Visbeck, McMurdo - New Zealand) has been added to the Global Multi-Resolutional Topography compilation.

November 2007

Global Multi-Resolution Topography compilation updated by the addition of multibeam data from cruise A112-24 (Hey, Puntarena - Acapulco).

August 2007

Basic cruise information for KN189-04 (Hey) to the Reykjanes Ridge now available.

July 2007

Bathymetric grids of the Hawaiian region from cruise TN151 (Garcia/ Duennebier) now available.

Multibeam swath data files for cruises EW0108 in the Gulf of Corinth, Greece (Taylor/Goodliffe/Him/Sachpazi) and AVON01MV (Lonsdale), along with a bathymetric grid grom IFREMER for the Mediterranean Sea have been added to the Global Multi-Resolution Topography (GMRT) tiles.



March 2006

New search capability now available in Data Link. In addition to the ability to search by geographic area, ISS, investigator and cruise ID, you can now search by the full list of data types or device types cataloged in the database. Use these search options to find out where the selected data type has been collected and to download any data files available in the database.

Many new data sets now available for exploring through the Databases menu in GeoMapApp. Select Import Data -> Load -> File -> Browse DataBases -> Global.

February 2006

Many new Help pages added to GeoMapApp.

January 2006

GeoMapApp v1.3.0 released with automatic focus as well as new features in the Import Data option on the Databases menu. Caution: after you load a grid in GeoMapApp the automatic focus will also automatically load a new grid each time you zoom and pan. Dispose of grid before zooming for best performance.



December 2005

Booth in Exhibition Hall at Fall AGU meeting features MGDS.

November 2005

Updated metadata forms package (version 3.5) is now available incorporating latest upgrades.

October 2005

New option in GeoMapApp to save images as “.kmz” files for viewing in GoogleEarth. With this option,  use GeoMapApp to dynamically generate a map of area of interest, save image as a Google Earth *.kmz file to your desktop and then open with GoogleEarth.

Web Map Service (WMS) beta service now deployed to serve our global bathymetry. WMS is a standard for web-services, proposed by the Open Geospatial Consortium (OGC). Web Map Service enables web-based creation of maps from raster and vector datasets. The generated maps can be visualized by common web-browsers and/or OGC-enabled client applications.

New options are now available within Data Link's Map View display;

  1. Beta version of new option in Map View to view global bathymetry (Global DEM option). Users can zoom in to display higher resolution bathymetry. Beta version has problem with map display at +/-180°longitude which affects maps for Lau Basin region. 
  2. Query function (under “Mode” button) now available within Map View links to further information on cruise/dive survey tracks or station information.

September 2005

An ISO 19115-compliant profile for cruise metadata has been developed for use as a REST-based web service.

June 2005

Multibeam Bathymetry grids from the Galapagos Spreading Center (GSC), contributed by Pablo Canales, have been added to GeoMapApp global grids and are now available (GSC_Canales).

Data were collected during cruise HE034 of the BIO Hesperides (Spain).

SeaMARCII bathymetry from the Ecuador Rift (GSC) is also now in GeoMapApp, giving nearly complete coverage of the Galapagos Spreading Center from 98°-83°W.

April 2005

High resolution grids for Papua New Guinea have been added to GeoMapApp DEM and are also available through MGDS (PNG_Naar).  Grids were contributed by David Naar and derived from EM-300 swath data from cruises VANC27MV, VANC28MV, and VANC30MV.

Gridded data from the Tonga trench collected on BMRG08MV (Bloomer and Wright) now available through Data Link.

New forms for reporting cruise information are now available for downloading. These forms are designed to capture who, what, when, where for a cruise as well as inventories of all data collected, line logs, deployed instrument information, station and sample logs.

March 2005

Bathymetry data from several cruises in the Southern Ocean now incorporated into the GeoMapApp Mercator projection bathymetry grids: NBP9806A (transit), NBP0101 (Amy Leventer), and NBP0202 (Robert Beardsley).

Added bathymetry data to GeoMapApp from several historical cruises with crossings in the Gulf of California region (AT03-46, MOCE05MV, PHNX03MV). Also added bathymetry data for region from EW0210 contributed by Dan Lizarralde.

Bathymetry for the Costa Rica margin from EW0005 (from Kirk McIntosh) now incorporated into GeoMapApp.

Data from the Southwest Indian Ridge collected on KN162-09, KN162-07 now added to GeoMapApp.

Data from the Hudson Canyon collected on AT01-03 added to GeoMapApp.

February 2005

Edited bathymetry for the Izu-Bonin-Mariana site (EW0202 and EW0203) received from Andrew Goodliffe and incorporated into GeoMapApp.

Bathymetry data for the Galapagos Spreading Center from EW0004 (Sinton and Detrick) now added to GeoMapApp.

Bathymetry data from the Galapagos Islands (DRFT04MV) contributed by Dan Fornari now added to GeoMapApp.



December 2004

New web site launched providing simplified access to all projects and tools of MGDS. Booth for data management system within Exhibition Hall at Fall AGU. Article on the DMS published in December 21 issue of EOS.

September 2004

Release of GeoMapApp 1.2 with several new features. Data sources for topography data in map view now dynamically displayed including acknowledgement of nation of origin. New "Import Data" option available. Option permits users to import their own ASCII data tables and display on bathymetry data, including color coding and symbol scaling based on data values.

August 2004

Bathymetry grid for Woodlark Basin assembled by Goodliffe and colleagues obtained from NGDC and now in GeoMapApp.

July 2004

Bathymetry data from cruise EW9903 from Cocos Plate now available. Bathymetry grid of Bouvet triple junction obtained from Marco Ligi, BologneLinks to PetDB now established for common cruises.

Reorganization of the web pages for the Ridge2000 and Margins Data Portals, the Ridge Multibeam Bathymetry Synthesis, Antarctic Multibeam Bathymetry Synthesis, and Seismic Field Data Center into a central site for all projects of the MarineGeoDMS (

Data Management System Oversight Committee Meeting July 19-20.

June 2004

Bathymetry for the Chile Rise (PANR04MV) and Barbados (EW0308) now incorporated into global grids.Bathymetry from cruise EW9101 to Antarctic Penninsula now available.

May-June 2004

New bathymetry from the South East Indian Ridge (EW0114) now available.

April 2004

Ultra-high resolution ABE bathymetry data from the EPR 9N ISS contributed by D. Fornari and colleagues and now available. Bathymetry can be accessed through GeoMapApp by selecting High_Res_Grids under the Places menu.

March 2004

Bathymetry from cruise EW9908 to the Nankai Trough now available.

New options for custom coloring topography data added in GeoMapApp. Options also available for creating a three-dimensional perspective view of topography.

February 2004

New data from the southern ocean - AAD region (BMRG06MV) added.

January 2004

All bathymetry data from original Ridge Multibeam Bathymetry Synthesis site now fully integrated with MarineGeoDMS and web pages moved to Bathymetry from MBARI (EUREKA, CENCAL, HAWAII, SANTA BARBARA) now incorporated into global grids and available through GeoMapApp.



December 2003

Coastal relief data for the continental US from NGDC now incorporated into GeoMapApp. Beta web site for the Ridge2000 Data Portal now online (

October 2003

Multibeam and geophysical data is now accessible and available for viewing and downloading using keyword searches through Data Link.

Summer 2003

Multibeam and Geophysical data from Nathaniel B. Palmer from 1992 to current acquired for database through the Antarctic Multibeam Bathymetry Synthesis (AMBS).

Begin migrating RMBS into new relational database designed to serve broad suite of marine geophysical data (MarineGeoDMS). Visit old RMBS site to view earlier history of database.