Marine Geoscience Data System

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New! May 6, 2014:  GeoMapApp User Forum created

We are pleased to announce that an on-line, moderated GeoMapApp User Forum has been created. We hope that the forum will serve as a vibrant hub for the exchange of knowledge and ideas. Users are invited to post their GeoMapApp questions and comments on the forum, as well as use their experience to answer questions from others.

Current GeoMapApp version is 3.4.1 (Released October 06, 2014)

GeoMapApp is an earth science exploration and visualization application that is continually being expanded as part of the Marine Geoscience Data System (MGDS) at the Lamont-Doherty Earth Observatory of Columbia University. The application provides direct access to the Global Multi-Resolution Topography (GMRT) compilation that hosts high resolution (~100 m node spacing) bathymetry from multibeam data for ocean areas and ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) and NED (National Elevation Dataset) topography datasets for the global land masses.


The application runs in the Windows XP, Windows Vista, Windows 7, Windows 8, Mac OS X (10.4, 10.5, 10.6, 10.7, 10.8, 10.9), Linux and Solaris operating systems using the Java Runtime Environment (requires version 1.6.0 or more recent).

Use the Download Links on the left to install the application.

Alternatively, if you are unable to install the application but have a Java-enabled browser, click here to launch GeoMapApp using Java WebStart (?).

Important News
If you're running GeoMapApp with Debian GNU/Linux 5.0 OS please view an important update here. (02.20.2010)

Learn More About GeoMapApp

To learn more about GeoMapApp take a look at our Multimedia Tutorials view our GeoMapApp Announcements or our Development History pages which are located on the left menu tabs.

Click Here for more information on how to cite GeoMapApp.

Join our Mailing List

If you've become a regular GeoMapApp user please subscribe to the announce-list, a moderated forum where the GeoMapApp developers will post release information and critical updates.
View our archive on past GeoMapApp announcements.

On December 5, 2014, we welcomed our 995th subscriber!


GeoMapApp relies on the internet to access a rich content of information for physical oceanography, paleoclimates, geochemistry, geology, seabed sediment and rock compositions, ocean crust age, spreading rates, bathymetry, and sediment thickness. One can select and view seismic reflection, gravity, magnetic and topographic profiles from tens of millions of kilometers of ocean surveys dating back to the 1960s. There are dedicated interfaces to explore the results of 40 years of ocean floor drilling, earthquake locations, magnitudes and epicenter depths, and seabed photographs from submersibles, remotely operated vehicles and towed camera sleds. The image in the map window can be saved or sent directly to a printer. Tabular datasets are selectable with lasso tools and can be manipulated in interactive graphs. Gridded datasets can be sun-shaded from selected directions and illumination angles then contoured. Users may import grids and tables from their own file system as well as from Web Mapping and Web Feature Services and take advantage all of the visualization capability of the application.

Below is a brief summary of our latest developments. To learn more view our Development History section.

  • Version 3.3

    1. The PetDB portal now includes recent data samples through March 2012. The controls for data selection within the portal have been simplified and certain non-relevant categories were removed.
    2. The Focal Mechanism Solutions portal activated once again. The plotted Centroid Moment Tensors (beachballs) have been improved but the portal is still under construction.
    3. Under the Save Map as Grid menu selection we have added an option to save the grid with a higher resolution.
    4. We've addressed several bugs reported by the GeoMapApp community, please check our development history page for more details.
  • Version 3.2

    1. We've optimized the startup time with a menu caching feature and included a small amount of tiles bundled with the application. This will significantly speed up the loading and viewing of the application.
    2. A new portal, Search Expedition Data, provides a searchable map-based cruise track interface. A range of search parameters allows the user to filter the cruise tracks on display.
    3. Significant new Antarctic additions include enhancements to the Digital Seismic Reflection Profiles portal, which now offers a connection to several surveys from the SCAR Seismic Data Library System (SDLS) and a separate portal for Radar Profiles of Antarctic Ice Thickness that provides images and access to airborne radar data from the Antarctica's Gamburtsev Province Project (AGAP) and Lake Vostok.
    4. We've enhanced several portals and addressed several bugs reported by the GeoMapApp community.
  • Version 3.1

    1. The 'Multi-Channel Seismic Reflection Profiles' Portal has been renamed to 'Digital Seismic Reflection Profiles' and the 'Single-Channel Seismic Reflection Profiles' Portal to 'Analog Seismic Reflection Profiles'.
    2. Updated the'Locations and Timing of Seafloor Earthquakes and Volcanic Eruptions' portal to reflect the most current seismicity catalogs provided by the PMEL hydroacoustic database. We've also included a new menu option to view local seismicity episodes as provided by the PMEL database.
    3. Updated the 'Multi-Channel Seismic Reflection Profiles' portal to include new options to access seismic data (both multi channel and single channel) from the USGS. The portal has also been updated with the most recently released stacked and migrated profiles within the holdings of the UTIG and LDEO Academic Seismic Portal.
    4. Improved loading of the global GMRT grid at resolutions higher than the global view.
  • Version 3.0

    1. This release represents a major upgrade to the base topography dataset accessible through GeoMapApp to include the GMRT 2.0, 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 of GeoMapApp. For North America, the even higher resolution NED dataset (USGS) is now used, providing topography of the continental U.S. to 10 m resolution.
    2. For the oceans, the GMRT v2.0 synthesis includes bathymetric coverage to 100 m resolution from multi-beam bathymetry mapping expeditions and regional gridded compilations from a number of areas and international sources. New data coverage within GMRT v2.0 is focused in the Atlantic and central Pacific with over 100 expeditions added since the prior release, GMRT v1.0. 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.
  • Version 2.8

    1. A dynamic Windows menu located on the main map window beside the Help menu manages all currently opened child windows by displaying a dynamic list. By selecting the item it will help bring the hidden window to front. This includes those which are minimized and docked.
    2. Import, export, and delete a custom color palette. From the grid dialog box users can find the Palette menu which include options to delete a custom color palette from GMA, export a .lut file to their desktop or file directory of choice and import a .lut file into GMA.
    3. Added a Lock icon which controls keeping a color palette with range values in place. When a palette is imported it will automatically default to lock for the user. Zooming or panning will keep the same color palette with specified ranges locked in the map view. Click on the icon for locking or unlocking.
  • Version 2.6

    1. Improved ease of use with the new zoom and pan features. Zoom by the mouse scroll wheel and pan by right clicking your mouse and dragging. You can also pan the map by pressing down on the spacebar and moving your mouse. For Mac users who have a track pad enable the two finger scroll options. You can then zoom in and out with a up and down motion.
    2. Import and save in Microsoft Excel 2007 and 2010 Spreadsheets format .xlsx by going to the 'Import Table or Spreadsheet' section under the File menu. Once a data table is loaded in GMA we can save the selection or the entire data table in .xlsx format.
    3. Before importing a grid into GMA you can now edit the min and max on .grd and .G98 formatted grids. This can be done by going to the 'Import a 2-D Grid File' section under the File menu.
    4. Users must agree the displayed maps, images, and data tables are not to be used for navigation purposes before using GMA.
    5. Multi-Channel Reflection Profiles Portal featuring a sample of data from USGS.
    6. A handy tooltip now displays the opacity values on the layer manager.
  • Version 2.4

    1. Added NASA Worldwind DEM grid which is a merged DEM of the SRTM, ASTER, and the NED. The new NASA icon is located on the main toolbar in GeoMapApp.
    2. Imported tables may now contain a column labeled polyline, which consists of a sequence of comma separated longitudes and latitudes that define a line (i.e., ship tracks or seismic profiles). A polyline will now show on a map window. Selecting the line will bring you to the row in the table.
    3. The Grid dialog now shows the area of the viewports (ocean, land, and both), the mean elevation of the viewports (ocean, land, and both) and the mean slope of the viewports ocean, land, and both
    4. The Global Grids and Contributed Grids dialog boxes now include an Elevation and Slope (E/S) toggle button to show the distribution of the slope of the viewports (ocean, land, or both).
    5. New warning icon in the Layer Manager for those layers with a warning message.
  • Upon startup, there are choices of Mercator, North polar or South polar projections for the map window. Our Virtual Ocean application offers additional visualization on the surface of a rotating 3-D virtual globe with tilting to enhance the vertical exaggeration.