File dted download

About Us. Survey Manual. Key Officials. Careers and Employees. Doing Business. Emergency Management. What is a digital elevation model DEM? Where can I get global land cover data? What types of elevation datasets are available, what formats do they come in, and where can I download them?

The absolute vertical accuracy of GDEM v3 was calculated by comparison with more than 23, independent reference geodetic ground control points from the U. Because no single source of topographic information covered the entire land surface, GTOPO30 was derived from eight raster and vector sources that included a substantial amount of U. Defense Mapping Agency data. The qua. July 31, Earth Explorer The U.

Digital cartographic data from digital elevation models, digital l. The radars used during the SRTM mission were actually developed and flown on two Endeavour missions in The technology was modified for the SRTM mission to collect interferometric radar, which compared two radar images or signals taken at slightly different angles.

This mission used single-pass interferometry, which acquired two signals at the same time by using two different radar antennas. An antenna located on board the space shuttle collected one data set and the other data set was collected by an antenna located at the end of a meter mast that extended from the shuttle.

Differences between the two signals allowed for the calculation of surface elevation. Endeavour orbited Earth 16 times each day during the day mission, completing orbits. This version was then edited or finished by the NGA to delineate and flatten water bodies, better define coastlines, remove spikes and wells, and fill small voids.

Data for regions outside the United States were sampled at 3 arc-seconds approximately 90 meters using a cubic convolution resampling technique for open distribution. The voids occur in areas where the initial processing did not meet quality specifications.

Since SRTM data are one of the most widely used elevation data sources, the NGA filled the voids using interpolation algorithms in conjunction with other sources of elevation data. Some tiles may still contain voids. Users should check the coverage map in EarthExplorer to verify if their area of interest is available. EarthExplorer offers SRTM data with a regularly spaced grid of elevation points in three file formats:. These data were sampled at 3 arc-seconds using a nearest neighbor resampling technique for global coverage.

The German and Italian space agencies operated the X-band hardware and processed the data independently into a separate elevation data set. EE supports the searching of satellite, aircraft, and other remote sensing inventories through interactive and textual-based query capabilities. Science Explorer. Mission Areas. Unified Interior Regions. Science Centers. You may also be interested in QGIS tutorial. Now you can easily analyze the surface by seeing the contour map.

Hope this tutorials helped you. If you want to share some suggestion or want to ask some question do comment below. IMG file, newer version that is georeferenced and the older. I would like to overlay in GE, Can you help? Interesting read and very helpful.

The only issue i had was i cant get the psuedocolour range to work as the map disappears after changing the style and so cant create the contour map. These also is no option to create an contouring so maybe have a newer version of the software.

Also the possibility of the metadata not being in the files i downloaded from that link heights were there and nothing else.