Altitude of the light: in range: [] degrees Azimuth of the light: in range: [] degrees. Collectively these comprise a rectangular tiling of files that cover the area computed. The file names do not matter, but if you must know, the prefix refers to the TauDEM product being produced and the numbers following p, r, c refer to the processor, row and column in the file tiling produced.
This tauDEM is an advanced processing service. It is available for registered users, who understand these resource intensive algorithms and its products. In order to access or enable this service, please log in or request an account.
Job Description. These options allow users to describe and keep track of their jobs. Information entered below is recorded along with other job parameters in your personal lidar job archive accessed via myOpenTopo available only to registered OpenTopography users.
Job title up to characters. Job description up to characters. Enter your e-mail address for notification upon completion of processing. It is important to note that the vertical accuracy actually varies significantly across the U. What is a digital elevation model DEM? DEMs are created from a variety of sources. Those are being systematically replaced with DEMs derived from Filter Total Items: 5. View Citation.
Gesch, D. Remote Sens. Spatial Inf. Danielson, Jeffrey J. Carabajal, C. Filter Total Items: 2. Multimedia Gallery. Park Passes. Technical Announcements. Employees in the News. Emergency Management. Survey Manual. Shuttle Radar Topography Mission data were used to generate digital elevation data with a resolution of 1 arc-second for the United States and 3 arc-seconds for global coverage.
Back to Products Overview. 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.
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