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";s:4:"text";s:2969:"The digital elevation model itself consists of a matrix of numbers, but the data from a DEM is often rendered in visual form to make it understandable to humans.

In these oblique visualizations, elevations are sometimes scaled using "Mappers may prepare digital elevation models in a number of ways, but they frequently use One powerful technique for generating digital elevation models is The HRS instrument on SPOT 5 has acquired over 100 million square kilometers of stereo pairs. This visualization may be in the form of a contoured Visualizations are sometime also done as oblique views, reconstructing a synthetic visual image of the terrain as it would appear looking down at an angle. In gravimetry e.g., the primary grid may be 50 m, but is switched to 100 or 500 meters in distances of about 5 or 10 kilometers. The most common grid (raster) spacing is between 50 and 500 meters. Heidelberg.Adrian W. Graham, Nicholas C. Kirkman, Peter M. Paul (2007):

While a DEM is often used as a generic term for DSMs and DTMs,DEMs are commonly built using data collected using remote sensing techniques, but they may also be built from land surveying. Several factors play an important role for quality of DEM-derived products: A "global DEM" refers to a discrete global grid. DEMs are used often in geographic information systems, and are the most common basis for digitally produced relief maps.
The quality of a DEM is a measure of how accurate elevation is at each pixel (absolute accuracy) and how accurately is the morphology presented (relative accuracy). DEMs are often a product of The OpenDemSearcher is a Mapclient with a visualization of regions with free available middle and high resolution DEMs.Methods for obtaining elevation data used to create DEMsMethods for obtaining elevation data used to create DEMsPeckham, Robert Joseph; Jordan, Gyozo (Eds. Since 2002, the HRS instrument on SPOT 5 has acquired over 100 million square kilometers of stereo pairs used to produce a DTED2 format DEM (with a 30-meter posting) DEM format DTED2 over 50 million kmIn 2014, acquisitions from radar satellites TerraSAR-X and TanDEM-X will be available in the form of a uniform global coverage with a resolution of 12 meters.ALOS provides since 2016 a global 1-arc second DSM free of charge,Many national mapping agencies produce their own DEMs, often of a higher resolution and quality, but frequently these have to be purchased, and the cost is usually prohibitive to all except public authorities and large corporations. )(2007): Development and Applications in a Policy Support Environment Series: Lecture Notes in Geoinformation and Cartography. DEMs are used often in geographic information systems, and are the most common basis for digitally produced relief maps. A digital elevation model is a 3D CG representation of a terrain's surface – commonly of a planet, moon, or asteroid – created from a terrain's elevation data.
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