PostGIS is a spatial database extender for PostgreSQL object-relational database. It adds support for geographic objects allowing location queries to be run in SQL.
FROM city, superhero
WHERE ST_Contains(city.geom, superhero.geom)
AND city.name = 'Gotham';
In addition to basic location awareness, PostGIS offers many features rarely found in other competing spatial databases such as Oracle Locator/Spatial and SQL Server. Refer to PostGIS Feature List for more details.
The 2.1.4 release of PostGIS is now available.
The PostGIS development team is happy to release patch for PostGIS 2.1, the 2.1.4 release. As befits a patch release, the focus is on bugs, breakages, and performance issues
It has come to our attention that the PostGIS Raster support may give more privileges to users than an administrator is willing to grant. These include reading files from the filesystem and opening connections to network hosts.
ST_Intersection is much slower than relation checks such as
ST_CoveredBy, and ,
In many situations you know the intersection of 2 geometries
without actually computing an intersection. In these cases, you can skip the costly
ST_Intersection call. Cases like this:
This kind of question comes up a lot: As discussed in stackexchange Acquiring ArcGIS speed in PostGIS
The Institut Géographique National (IGN) is the national mapping agency for France, with 1800 employees and a mandate to collect, integrate, manage and distribute reference geographical information for the whole country.
Infoterra has been in the geospatial business for over 25 years, since its founding in 1980 as the UK National Remote Sensing Centre. In that time, NRSC grew, formed international partnerships with space agencies, expanded into aerial data collection, and was eventually privatized and re-named “Infoterra” in the late 1990s.