Glossary¶
- AGG
Anti-Grain Geometry A high quality graphics rendering engine that MapServer 5.0+ can use. It supports sub-pixel anti-aliasing, as well as many more features.
- CGI
Wikipedia provides excellent coverage of CGI.
- 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. A list of PROJ definitions corresponding to the EPSG codes can be found in the file /usr/local/share/proj/epsg. PROJECTION describes how to use these in your Mapfile.
See also
https://epsg.io/ for a listing of spatial references and an interface to search for EPSG codes (the old site https://spatialreference.org is no longer maintained, but might still be useful).
- Filter Encoding
Filter Encoding is an OGC standard which defines an XML encoding for filter expressions to allow for spatial and attribute querying.
See also
- FreeType
FreeType is a font engine that MapServer uses for accessing and rendering TrueType fonts.
- GD
GD is a graphics library for dynamic generation of images. It was the first graphics renderer that was available for MapServer, and was required by MapServer to operate.
Warning
GD support was removed in MapServer 7.0.
- 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 https://gdal.org/
- GEOS
Geometry Engine Open Source is a C/C++ port of the Java Topology Suite. It is used for geometric algebra operations like determining if a polygon is contained in another polygon or determining the resultant intersection of two or more polygons. MapServer optionally uses GEOS for geometric algebra operations.
- GML
Geography Markup Language is an OGC standard which defines an abstract model for geographic features
See also
- GPX
GPS eXchange Format is an XML Schema for describing GPS data. OGR can be used to transform and render this data with MapServer.
- Map Scale
A treatise of mapping scale can be found on about.com.
- Mapfile
Mapfile is the declarative language that MapServer uses to define data connections, map styling, templating, and server directives. Its format is xml-like and hierarchical, with closing
ENDtags, but the format is not xml.- MapScript
MapScript is an alternative the the CGI application of mapserv that allows you to program the MapServer object API in many languages.
- Mercator
Wikipedia provides excellent coverage of the Mercator projection.
- OGC
The Open Geospatial Consortium is a standards organization body in the GIS domain. MapServer supports numerous OGC standards.
See also
WMS Server and WMS Time and WMS Client and WFS Server and WFS Client and WCS Server and Map Context and SLD and WFS Filter Encoding and SOS Server
- OGR
OGR is the vector data access portion of the GDAL library. It provides access to a multitude of data formats.
See also
OGR Vector Layers Through MapServer (Accessing OGR Layers through MapServer)
- OM
Observations and Measurements is an OGC standard which defines an abstract model for sensor based data.
See also
- OpenLayers
OpenLayers is a JavaScript library for developing draggable, “slippy map” web applications.
- PROJ
PROJ (formerly referred to as PROJ.4) is a library for projecting map data. It is used by MapServer and GDAL and a multitude of other Open Source GIS libraries.
- 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.
See also
- SLD
SLD is an OGC standard which allows for custom symbolization for portrayal of data.
See also
- SOS
SOS is an OGC standard which provides an API for managing deployed sensors and retrieving sensor and observation data.
See also
- Spherical Mercator
Spherical Mercator is a term used to describe the PROJECTION used by many commercial API providers.
- SVG
Scalable Vector Graphics is an XML format that MapServer can output. It is frequently used in browser and mobile devices.
See also
- SWF
Shockwave Flash format that MapServer can generate for output.
See also
- SWIG
Simplified Wrapper Interface Generator is the library that MapServer uses for generating the language bindings for all languages other than C/C++ and PHP. MapScript describes these bindings.
- Tileindex
A tileindex is a Shapefile or other Vector data source that contains footprints of Raster data coverage. MapServer can use a tileindex to render a directory of raster data. The tileindex allows MapServer to only read the data that intersects the requested map extent, rather than reading all of the data.
See also
- Vector
Geographic features described by geometries (point, line, polygon) on a (typically) cartesian plane.
- WCS
WCS is an OGC standard that describes how to systematically produce structured Raster cartographic data from a service and return them to a client
See also
- WFS
WFS is an OGC standard that describes how to systematically produce structured Vector cartographic data from a service and return them to a client.
See also
WFS Server and WFS Client
- WMC
Web Map Context is an OGC standard which allows for sharing of map views of WMS layers in multiple applications.
See also
- WMS
WMS is an OGC standard that describes how to systematically produce rendered map images from a service and return them to a client.
See also
WMS Server and WMS Client