Glossary for Geospatial Science

vector units:� The units in which vector coordinates and vector object extent are expressed.� These units are specific to individual vector objects and are dependent on how the vector was created.� The unit size may be a screen pixel and the object extents the same as the drawing area in pixels if the vector object was drawn without a reference object.� The unit size is related to the number of raster cells if the vector is created using an ungeoreferenced raster for reference; the object extents equal the number of raster cells times the cell size.� The units correspond to geographic coordinates and the object extents correspond to the geographic extents if the vector is created over a georeferenced object.