Docs in progress for 'QGIS testing'. Visit https://docs.qgis.org/3.4 for QGIS 3.4 docs and translations.
GDAL-SOFTWARE-SUITE. Geospatial data abstraction library. https://www.gdal.org, 2013.
GRASS-PROJECT. Geographic resource analysis support system. https://grass.osgeo.org, 2013.
Neteler,M.和Mitasova,H.开源地理信息系统:草地地理信息系统方法,2008年。
OGR-SOFTWARE-SUITE. Geospatial data abstraction library. https://www.gdal.org/ogr, 2013.
OPEN-GEOSPATIAL-CONSORTIUM. Web map service (1.1.1) implementation specification. https://portal.opengeospatial.org, 2002.
OPEN-GEOSPATIAL-CONSORTIUM. Web map service (1.3.0) implementation specification. https://portal.opengeospatial.org, 2004.
POSTGIS-PROJECT. Spatial support for postgresql. http://postgis.refractions.net/, 2013.