Tools and Data

Tool 1


GeoMapApp is a global topography and bathymetry database that is integrated with an application to explore the data. The visualization tool was developed as part of the Marine Geoscience Data Management System. It is a Java™ application that will run on any computer platform with a Java Runtime Environment.

The program supports zooming in and out on maps, scrolling, the ability to "focus" an image for the current view, and to highlight areas of high resolution data on maps. It also supports generation of profiles and contour maps, the ability to customize maps with an interactive palette tool, generate 3D perspective images, select gravity and geoid grids, and save maps and grids.

Tool Builder
Lamont-Doherty Earth Observatory, Columbia University, New York.

Tool Cost


Tool Help

Online help is available through the GeoMapApp Help Pages.

Tool 2

Microsoft Excel

Microsoft Excel or similar spreadsheet program, such as Open Office. This chapter was written using Microsoft Excel 2008.

Tool Builder

Microsoft Corporation
Home Page for Excel

Tool Cost

Microsoft Excel is available as a free trial:

Open Office can be downloaded for free from:

Tool Help

Excel help is available online Excel Help Page

Data Source

Global Digital Elevation Model (DEM)

The Global Multi-Resolution Topography (GMRT) Synthesis is maintained as a multi-resolution gridded global Digital Elevation Model (DEM) that includes cleaned processed ship-based multibeam sonar data at their full spatial resolution (~100m in the deep sea). GMRT is the default basemap for GeoMapApp .

Data Provider

Ryan, W.B.F., S.M. Carbotte, J.O. Coplan, S. O'Hara, A. Melkonian, R. Arko, R.A. Weissel, V. Ferrini, A. Goodwillie, F. Nitsche, J. Bonczkowski, and R. Zemsky (2009), Global Multi-Resolution Topography synthesis, Geochem. Geophys. Geosyst., 10, Q03014, doi: 10.1029/2008GC002332