General

CGI #

CGI (Common Gateway Interface) is ...

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.

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.

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/ .

Join #

A join is ...

Map Scale #

Map scale is ...

Mercator #

Mercator is a map projection

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.

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.

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.

Vector #

Vector data is ...