![]() ![]() ![]() The DEM type decision depends on the analysis of interestÄigital vector topography can clearly define boundaries, such as valley floors or ridge lines. Choosing to represent digital topography in either vector or raster (TIN or DEM) format depends on the type of GIS analysis a user wants to perform. Raster format divides the topographic surface into equally spaced intervals or a gridded array and then displays the elevation value for each grid cell (called a digital elevation model or DEM). Vector format uses a series of irregularly spaced elevation points connected by lines into a triangulated irregular network (TIN). Digital topography can be represented in either vector or raster format. The recent explosion of Geographic Information System (GIS) tools enable geoscientists to visualize the Earth's surface in three dimensions using digital topography. ![]()
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