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Data set errata

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Errata and known issues

While every effort is made to make GEBCO's gridded products as error free as possible, some artifacts created during the gridding process may still occur. A list of reported bugs and known issues is included on this page.

If you find any bugs in the data set that are not reported here then please contact the Seabed 2030 Global Data Center.

Latest GEBCO grid

The GEBCO_2021 Grid is GEBCO's latest bathymetric grid. It was published in July 2021 and is a global terrain model at 15 arc-second intervals. Reported bugs and known issues in the grid are listed below.

North Atlantic Ocean
Specific area Problem(s) reported Comments
Mediterranean Sea region
Specific area Problem(s) reported Comment
North Pacific Ocean
Specific area Problem(s) reported Comment
South China and Eastern Archipelagic Seas
Specific area Problem(s) reported Comment
Malacca Strait (98° 22'E, 8° 6'N) Anomalous areas of 'land' - i.e. positive elevation values reported between the island of Phuket and mainland Thailand.

 

South Pacific Ocean
Specific area Problem(s) reported Comment
Torres Strait (142°'E, 9°S) - Southwest Pacific Ocean Anomalous 'trench feature' reported in shallower water region.

View imagery to illustrate this artifact Adobe PDF document containing imagery to illustrate the anomalous trench feature in the Torres Strait region (400 KB)

 

Indian Ocean
Specific area Problem(s) reported Comment

GEBCO's historical gridded bathymetric data sets

GEBCO has made available a number of gridded bathymetric data sets since the publication of the GEBCO One Minute Grid in 2003. Access errata information for these data sets.

GEBCO_2020

The GEBCO_2020 Grid was published in April 2020 and is a global terrain model at 15 arc-second intervals.

North Atlantic Ocean
Specific area Problem(s) reported Comments
Off the Cape Verde Islands in the North Atlantic Ocean (24° 30'W, 16° 30'N) Two areas of anomalously shallow depth values have been reported in the area off the Cape Islands.

View imagery to illustrate this artifact Adobe PDF document containing imagery to illustrate the anomalous areas of shallow data off Cape Verde Islands (130 KB)

Corrected in the GEBCO_2021 Grid

Off the coast of Massachusetts/Rhode Island, USA in the North Atlantic Ocean (71° 30'W, 41° 30'N) In the coastal region off Massachusetts, USA, the GEBCO grid shows erroneous areas of bathymetry data that should be represented as land. Adobe PDF document detailing errata information for the GEBCO_2020 Grid off the coast of Massachusetts, USA (141 KB)

Corrected in the GEBCO_2021 Grid

La Guajira region, Colombia, Caribbean Sea (72°W, 12° 30'N) An area of land is erroneously coded as bathymetric depths. Adobe PDF document detailing errata information for the GEBCO_2020 Grid in La Guajira region, Colombia, Caribbean Sea (279 KB)

Corrected in the GEBCO_2021 Grid

North American Great Lakes region (82°'W, 43°N) Anomalously deep bathymetric values have been reported in the GEBCO_2020 Grid in some parts of Lake Huron, Lake Erie and Lake Ontario. Adobe PDF document detailing errata information for the GEBCO_2020 Grid in the North American Great Lakes region (138 KB)

Corrected in the GEBCO_2021 Grid

Rocket Seamount (36° 9'W 15° 50') The feature erroneously appears above sea level.

Corrected in the GEBCO_2021 Grid

Northern Europe (6.5°E, 50.6°N) Erroneous 'depth' values in land areas. Adobe PDF document detailing errata information for the GEBCO_2020 Grid in the region of North Europe (119 KB)

Corrected in the GEBCO_2021 Grid

Mediterranean Sea region
Specific area Problem(s) reported Comment
In the Gulf of Gabès region, Mediterranean Sea (11°E, 34° 20'N) An area of anomalously deep bathymetric values have been reported in the GEBCO_2020 Grid in this region. Adobe PDF document detailing errata information for the GEBCO_2020 Grid in the Gulf of Gabes region, Mediterranean Sea (395 KB)

 

Adriatic Sea (16° 20'E, 43° 30'N) An area of anomalously deep bathymetric values have been reported in the GEBCO_2020 Grid in this region. Adobe PDF document detailing errata information for the GEBCO_2020 Grid in the Adriatic Sea (390 KB)

Improved in the GEBCO_2021 Grid

North Pacific Ocean
Specific area Problem(s) reported Comment
East China Sea region (124°E; 30°N) Lines of discontinuity reported in the GEBCO_2020 Grid.

View imagery to illustrate this issue Adobe PDF document containing imagery to illustrate lines of discontinuity in the GEBCO_2020 Grid in part of the East China Sea region (319 KB)

Corrected in the GEBCO_2021 Grid

South Pacific Ocean
Specific area Problem(s) reported Comment
Southwest Pacific Ocean (140°E-180°E; 0°S-20°S) Trackline coverage missing from the GEBCO_2020 Type Identifier Grid

Grid cells that are constrained by data within the area 140°E-180°E; 0°S-20°S have been erroneously obmitted from the data set.

Fixed, July 2020

Southeast Pacific Ocean (70°W; 22°S) Anomalous deep areas identified near to the coast - due to sparse coverage of sounding point data in shallower water areas to help constrain the base grid during the gridding process.

Improved in the GEBCO_2021 Grid

Indian Ocean
Specific area Problem(s) reported Comment
Southern Indian Ocean (99°E; 55°S) Line of erroneous 'elevation' values

View imagery to illustrate this artifact Adobe PDF document containing imagery to illustrate an anomalous line of elevation values in the GEBCO_2020 Grid around 99E, 55S (471 KB)
Improved in the GEBCO_2021 Grid
Southern Ocean
Specific area Problem(s) reported Comment
Southern Ocean off Antarctica (135°W-120°W; 75°S-69°S) In the region of the Getz Ice Shelf there is an anomalous trough-like feature shown in the GEBCO_2020 Grid. This issue appears to be caused by a navigation distortion in part of a cruise trackline.

View imagery to illustrate this artifact Adobe PDF document containing imagery to illustrate an anomalous trough-like feature shown in the GEBCO_2020 Grid in the Getz Ice Shelf region (1.7 MB)
Improved in the GEBCO_2021 Grid

GEBCO_2019

The GEBCO_2019 Grid was published in April 2019 and is a global terrain model at 15 arc-second intervals.

Indian Ocean
Specific area Problem(s) reported Comment

Off Aldabra Island in the Outer Islands of the Seychelles island group (46° 30'E, 9° 20'S)

An anomalous ridge, with an elevation of up to 200m above sea-level encircling the atoll, has been reported.

View imagery to illustrate this artifact Adobe PDF document containing imagery to illustrate the anomalous ridge feature encircling Aldabra Island (488 KB)

Fixed in the GEBCO_2020 Grid

Coastal waters off Sri Lanka (82°E, 7°N)

It has been reported that there are a number of erroneous 'islands' in the GEBCO_2019 Grid in the coastal area off Sri Lanka which may be the result of the gridding process.

View imagery to illustrate this artifact Adobe PDF document containing imagery to illustrate the location of erroneous 'islands' in the GEBCO_2019 Grid in the coastal area off Sri Lanka (485 KB)

Fixed in the GEBCO_2020 Grid

North Atlantic Ocean
Specific area Problem(s) reported Comment

Northwest Atlantic Ocean (45°W, 52°N)

An anomalous 'trench-like' feature has been reported in the GEBCO_2019 Grid. This appears to relate to the inclusion of source trackline data into the GEBCO_2019 Grid in this region.

View imagery to illustrate this artifact Adobe PDF document containing imagery to illustrate an anomalous trench-like feature in the GEBCO_2019 Grid (571 KB)

 

Errata information for GEBCO's grids prior to GEBCO_2019

North Atlantic
Specific area Problem(s) reported Comment

North Sea

Reported in version 20090202 (GEBCO_08) — A 'grid pattern' is visible in the gridded data set in the southern part of the North Sea. This is an artifact created during the gridding process.

View imagery to illustrate this artifact Adobe PDF document containing imagery to illustrate the 'grid pattern' artifact in the GEBCO_08 in the southern North Sea (246 KB)

This bug has been fixed in version 20141103 of the grid (GEBCO_2014), released in December 2014.

North Sea

Reported in version 20091120 (GEBCO_08) — A line of discontinuity is visible in the grid along 0°E in parts of the North Sea. This is the result of a mis-match at this boundary between input data sets used to generate the GEBCO_08 Grid.

View imagery to illustrate this artifact Adobe PDF version of a document showing a line of discontinuity at 0 degrees East in the GEBCO_08 Grid in the North Sea region (212 KB)

This bug has been fixed in version 20141103 of the grid (GEBCO_2014), released in December 2014.

Irish Sea

Reported in version 20091120 (GEBCO_08) — Anomalous deeps have been reported in the grid for some coastal regions in the Irish Sea area, i.e. the Solway Firth, Morecambe Bay, Dee Estuary, the Mersey Estuary and the approaches to Anglesey.

View imagery to illustrate this artifact Adobe PDF document which illustrates the anomolous deep water areas shown in the GEBCO_08 Grid for some coastal regions in the Irish Sea (176 KB)

The area of the reported bug has been improved in version 20141103 of the grid (GEBCO_2014), released in December 2014.

Region off Dakar

Reported in version 20091120 (GEBCO_08) — Anomalous deep regions (between 150m and 200m) have been reported in the shallower water areas off Dakar (14° 42'N, 17° 24'W). These artifacts have been created during the gridding process due to a lack of source sounding data in shallower water regions.

View imagery to illustrate this artifact Adobe PDF document which illustrates the anomolous deep water areas shown in the GEBCO_08 Grid for some coastal regions off Dakar (227 KB)

This bug has been fixed in version 20141103 of the grid (GEBCO_2014), released in December 2014.

Continental shelf north of the Bay of Biscay

Reported in version 20091120 (GEBCO_08) — There are anomalous peaks and troughs shown in the GEBCO_08 Grid in the shallower water areas of the continental shelf north of the Bay of Biscay. These artifacts have been created during the gridding process due to a lack of source sounding data in shallower water regions.

View imagery to illustrate this artifact Adobe PDF document which illustrates the anomolous peaks and troughs shown in the GEBCO_08 Grid for the continental shelf off the Bay of Biscay (350 KB)

The area of the reported bug has been improved in version 20141103 of the grid (GEBCO_2014), released in December 2014.
Region off Vigo

Present in version 20100927 (GEBCO_08) and earlier versions — Anomalous ‘trench-like’ feature shown in the GEBCO_08 Grid in the region off the coast of Vigo, Spain (42°N, 9° 30’W). This is an artifact created during the generation of the grid, caused by anomalous soundings along a ship track.

View imagery to illustrate this artifact Adobe PDF which illustrates the anomolous 'trench-like' feature shown in the GEBCO_08 grid in the region off Vigo (279 KB)

This bug has been fixed in version 20141103 of the grid (GEBCO_2014), released in December 2014.
Waters around the Bahamas

Present in version 20100927 (GEBCO_08) and earlier versions — Anomalous deeps have been reported in the shallow water regions off the Bahamas (25°N, 76°W). These artifacts have been created during the gridding process due to a lack of source sounding data in shallower water regions.

View imagery to illustrate this artifact Adobe PDF document showing the artifacts in the GEBCO_08 Grid in shallow water regions off the Bahamas (229 KB)

North Atlantic Ocean near the Faroe Islands

Present in version 20100927 (GEBCO_08) and earlier versions — Anomalous shallow water areas have been reported near Faroe Bank (60° 49'N, 9° 21'W). These artifacts have been created during the gridding process.

View imagery to illustrate this artifact Adobe PDF document illustrating a bug in the GEBCO_08 Grid off Faroe Bank (348 KB)

This bug has been fixed in version 20141103 of the grid (GEBCO_2014), released in December 2014.
North Atlantic Ocean In version 20150318 (GEBCO_2014) and present in earlier versions an anomalously shallow feature has been reported in the region 4° 35' 49''W; 0° 34' 51''N.  
South Atlantic
Specific area Problem(s) reported Comment
Southeast Atlantic Ocean In version 20150318 (GEBCO_2014) and present in earlier versions an anomalously shallow feature has been reported in the region 3° 10' 48''E; 5° 44' 19''S. In this area the grid is based on interpolation.  
North Pacific
Specific area Problem(s) reported Comment
No problems reported
South Pacific
Specific area Problem(s) reported Comment
Coral Sea

Reported in version 20100927 (GEBCO_08) — Anomalous deep regions reported in the Moreton Bay area off Brisbane, Australia ( 27.14°S, 153.3°E). These are artifacts created during the generation of the grid, caused by anomalous soundings in a source survey data set.

View imagery to illustrate this artifact Adobe PDF which illustrates the anomolous deep features shown in the GEBCO_08 Grid in the Moreton Bay region off Brisbane, Australia (263 KB)

This bug has been fixed in version 20141103 of the grid (GEBCO_2014), released in December 2014.
Coral Sea

Reported in version 20100927 (GEBCO_08) and present in earlier versions — A scientific research cruise between Australia and New Caledonia has reported that Sandy Island (19° 14'S, 159° 57'E) does not exist. This feature has been included in GEBCO's grid via coastline and topography data sets.

Find out more about this feature's inclusion in the GEBCO_08 Grid Adobe PDF of a document about the inclusion of "Sandy island" in the GEBCO_08 Grid (104 KB)

This bug has been fixed in version 20141103 of the grid (GEBCO_2014), released in December 2014.
Southwest Pacific Ocean

Reported in version 20100927 (GEBCO_08) and present in earlier versions — north of the island of New Guinea (1° 59’S, 141° 30’E) there is a line of cells in the GEBCO_08 grid erroneously labelled as land data (between and 141° 59’ 31’’E, 141° 0’ 25’E ).

View imagery to illustrate this artifact.  Adobe PDF which illustrates the erroneous line of grid cells labelled as land in the GEBCO_08 Grid off the island of New Guinea (357 KB)

This bug has been fixed in version 20141103 of the grid (GEBCO_2014), released in December 2014.
Southwest Pacific Ocean Reported in version 20100927 (GEBCO_08) and present in earlier versions — east of Norfolk Island (29° 2'S, 167° 56'E) an extra area of land is present in the GEBCO_08 Grid. This bug has been fixed in version 20141103 of the grid (GEBCO_2014), released in December 2014.
Indian Ocean
Specific area Problem(s) reported Comment
Persian Gulf - Gulf of Bahrain

Reported in version 20150318 (GEBCO_2014) and present in earlier versions — there are anomalous deep regions near to the coast at 25°N, 50.694°E. These artifacts have been created during the gridding process due to a lack of source sounding data in shallower water regions. Therefore the grid cells in this area have interpolated depth values.

View imagery to illustrate this artifact. Adobe pdf document illustrating an artifact in the GEBCO grid in the Persian Gulf region (271 KB)

 
Southern Ocean
Specific area Problem(s) reported Comment
Southern Ocean

Reported in version 20141103 (GEBCO_2014). In the region south of 60°S the GEBCO_2014 Grid is based on v1 of the International Bathymetric Chart of the Southern Ocean (IBCSO).

There is a 500m (approximate) shift in latitude northwards of the data in the GEBCO_2014 Grid compared to the source IBCSO grid in the region south of 60°S. This error appears to have occurred during the process to include the IBCSO grid into GEBCO.

This bug has been fixed in version 20150318 of the grid (GEBCO_2014), released in March 2015.
Mediterranean Sea
Specific area Problem(s) reported Comment
No problems reported
Other areas
Specific area Problem(s) reported Comment

Mekong Delta region of Vietnam

There are cell values in the GEBCO_2014 Grid on land that have been labelled with a value of '-1'.

View imagery to illustrate this artifact. Adobe PDF document showing the error in the GEBCO_2014 Grid in the Mekong Delta region. (210 KB)

This bug has been reported in version 20150318 of the grid (GEBCO_2014).