Glossary for Geospatial Science

georeference or geographic calibration:� Information that relates raster cells or vector/CAD elements to a specified coordinate system or map projection.� The RVC file format keeps the information needed to relate every raster cell or vector coordinate point to some geographic coordinate system (like a particular map projection) in subobjects associated with the parent object.� Geographic calibration may be established when creating an object (like extracting an image map from a Landsat or SPOT satellite image).� Calibration can also be added to an existing object either by entering control points or by associating it with some calibrated object (like overlaying a calibrated vector to calibrate a raster).� An RVC subobject identifies a calibrated object�s map projection.