Development of elevation derivatives for Central America and the Caribbean

Development of elevation derivatives for Central America and the Caribbean using the Shuttle Radar Topography Mission (SRTM) level-2 dataset (30 meter resolution, limited distribution).

The elevation derivatives include datasets such as basins, streamlines, hill shade, slope, aspect, water flow, and water accumulation.  The derivatives were produced by the U.S. Geological Survey (USGS) Center for Earth Resources Observation and Science (EROS), and the final products were provided to selected national agencies in each country, which will be responsible for completing some of the products (i.e., streamlines), labeling them, and developing metadata.

Development of digital elevation maps

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Prior to the project the Central America and Caribbean region lacked integrated digital elevation data at high resolutions.  The best regional dataset available was a 1Km. resolution DEM developed by the USGS (GTOPO30).

As part of the project EROS developed elevation derivatives for all the Central American and Caribbean countries (except Cuba and Trinidad and Tobago).  The data was derived from the Shuttle Radar Topography Mission (SRTM) Level-2 dataset (30-meter resolution) and offers better resolution, quality and geographic scope than any dataset previously available.

The SRTM is a joint initiative of the U.S. National Geospatial-Intelligence Agency (NGA) and NASA to develop topographic data for 80% of the earth’s land mass at resolutions approaching 30 meters (http://www2.jpl.nasa.gov/srtm/).

 EROS was authorized to process the 30-m data for Central America and the Caribbean under an agreement with the National Geospatial-Intelligence Agency (NGA).  Derived products were developed for the following countries: Panama, Costa Rica, Nicaragua, El Salvador, Honduras, Guatemala, Belize, Dominican Republic, Haiti, Jamaica, and Southern Yucatan.

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Dominican Republic SRTM Hill Shade draped over a land use/cover

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Guatemala Hill Shade

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Guatemala Slope

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Guatemala Aspect

The following datasets are available for each country:

  • Hill Shade
  • Slope
  • Aspect
  • Basins
  • Streamlines
  • Flow accumulation
  • Flow direction

Integrated regional datasets for Central America were also developed for some of the topics above.

All data products were provided to the ministries of environment and geographic institutes of participating countries. The public can also access and download them from http://geospatial.iabin.net/SRTM-Derivatives/DEM-Derived-Maps.html. Specialists from all the countries mentioned above received training on the development of these datasets during a workshop that took place in March 2006 in Panama.

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