Photogrammetric project data are compiled on state of the art softcopy workstations employing stereo-imposition display technology. Stereo-imposition of digitized features is invaluable to the assessment of accuracy and content during compilation and quality control. Whether the project consists of planimetric feature data, DTM data, generated contours, digitized contours or volumetric data, stereo models are subjected to quality control reviews prior to their acceptance as complete and true data sets.
A contour line joins areas of equal elevation above a given level, such as mean sea level. A contour map is a map illustrated with contour lines, which show valleys and hills, and the steepness of slopes. In this sense a contour map can be very useful in many contexts. One method for creating contour lines is by using Digital Elevation Models (DEM). A DEM is a digital model or 3D representation of a terrain's surface.
A contour line joins areas of equal elevation above a given level, such as mean sea level. A contour map is a map illustrated with contour lines, which show valleys and hills, and the steepness of slopes. In this sense a contour map can be very useful in many contexts. One method for creating contour lines is by using Digital Elevation Models (DEM). A DEM is a digital model or 3D representation of a terrain's surface.