If you are looking for free dem, use the srtm dted1see cgiar or on earthexplorer. It is suggested you download the files to a folder called \elevation data\dted located. Dted level 2 corresponds to medium to large scale hardcopy products, and has a post. Macdem is an application to view and edit digital elevation model dem files. Dted is a standard of digital datasets which consists of a matrix of terrain elevation values, i. Some code to load and process digital terrain elevation data dted files. Dted products are produced at three levels of resolution described below. It provides basic quantitative data for all military systems that require terrain elevation, slope and gross surface roughness information.
Level 2 dted files have a minimum resolution of 1 arcsecond near the equator. Level 1 has a post spacing of approximately 90 meters. Wgs 84 is the horizontal datum and mean sea level is the vertical datum jeddah 1969. Nga will acquire new level 2 data as a result of the shuttle radar topography mission srtm. Srtm dted level 2 1 arc second data for the united states and territotial slands is. For information on locating map data for download over the internet, see the. Dted data is available at three different resolutions, which are referred to as level 0, level 1 and level 2. The dma later changed its name to national imagery and mapping agency nima but is now called the national geospatial intelligence agency nga. The dted format for level 0, 1 and 2 is described in u. Dted level 2 corresponds to medium to large scale hardcopy products, and has a post spacing of one arcsecond, or 30 meter nominal resolution.
Shuttle radar topography mission dted level 1 3arc second data dted1. Digital terrain elevation data dted map and data library. Digital terrain elevation data dted dted is a uniform matrix of terrain elevation values. Dted level 2 elevation values are spaced one arc second apart. Dted level 1 corresponds to medium scale hardcopy products, and has a post spacing of three arcseconds, or 100 meter nominal resolution. Free download but login required the gtopo30, srtm and srtm void filled. Digital terrain elevation data national geospatial. Each dted file contains elevation data for a 1 degree latitude by 1 degree longitude cell. Usgs eros archive digital elevation shuttle radar topography. Dted level 2 30m will be available thru the 2000 sts99 shuttle ifsar mission in 2001. Dted level 2 is a uniform gridded matrix of terrain elevation values with post spacing of one arc second approximately 30 meters. Click the eye icon next to the desired product to begin the download.
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