http://mapserver.gis.umn.edu Glossary of terms. weekly 1 2005-11-19T22:08:21Z http://mapserver.gis.umn.edu/docs/glossary/epsg EPSG codes are numeric codes associated with coordinate system definitions. For instance, EPSG:4326 is geographic WGS84, and EPSG:32611 is "UTM zone 11 North, WGS84". The WMS protocol uses EPSG codes to describe coordinate systems. EPSG codes are published by the OGP Surveying and Positioning Committee (http://www.epsg.org/). A list of PROJ.4 definitions corresponding to the EPSG codes can be found in the file /usr/local/share/proj/epsg. No publisher FrankW Projections 2005-12-13T01:26:04Z Definition http://mapserver.gis.umn.edu/docs/glossary/projection A map projection is a mathematical transformation of the surface of a sphere (3D) onto a 2D plane. Due to the laws of the universe, each type of projection must make tradeoffs on how and what features it distorts. No publisher adamhill Projections 2005-12-14T19:34:19Z Definition http://mapserver.gis.umn.edu/docs/glossary/mercator Mercator is a map projection No publisher hobu 2005-12-12T21:46:19Z Definition http://mapserver.gis.umn.edu/docs/glossary/map_scale Map scale is ... No publisher hobu 2005-12-12T21:46:46Z Definition http://mapserver.gis.umn.edu/docs/glossary/join A join is ... No publisher hobu 2005-12-12T21:47:17Z Definition http://mapserver.gis.umn.edu/docs/glossary/CGI CGI (Common Gateway Interface) is ... No publisher hobu 2005-12-12T21:47:48Z Definition http://mapserver.gis.umn.edu/docs/glossary/raster A raster is a rectangular grid of pixels. Essentially an image. Rasters are supported in MapServer with a layer type of RASTER, and a variety of formats are supported including GeoTIFF, JPEG, and PNG. No publisher FrankW 2005-12-13T01:24:20Z Definition http://mapserver.gis.umn.edu/docs/glossary/vector Vector data is ... No publisher hobu 2005-12-12T21:48:43Z Definition http://mapserver.gis.umn.edu/docs/glossary/GDAL GDAL (Geospatial Data Abstraction Library) is a multi-format raster reading and writing library. It is used as the primary mechanism for reading raster data in MapServer. It is hosted at http://www.gdal.org/ . No publisher FrankW GDAL 2005-12-13T01:25:10Z Definition http://mapserver.gis.umn.edu/docs/glossary/data_scale Data scale is the scale at which the data were digitized or collected. Imagery is usually considered continuous in scale, whereas digitized linework is often digitally captured at specified paper scale. No publisher hobu 2005-12-12T21:51:05Z Definition http://mapserver.gis.umn.edu/docs/glossary/shapefile Shapefiles are simple GIS vector files containing points, lines or areas. The format was designed and published by ESRI and is widely supported in the GIS world. It is effectively the native and highest performance format for MapServer. No publisher FrankW 2005-12-13T01:24:40Z Definition