3 terms
Data
Data in general is any collection of facts and values. In a GIS lexicon "data" is often too broad: for spatial work one almost always means geodata or spatial data — information with a location component.
Read full explanationData Types
Data types in GIS are the main categories of geographic information: vector data (points, lines, polygons with attributes), raster data (cells/pixels with values), and sometimes TINs or point clouds for 3D.
Read full explanationDEM
A DEM (Digital Elevation Model) is a raster where each cell holds an elevation value above a reference level (usually NAP in the Netherlands). It represents terrain relief as a grid, not as loose elevation points.
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