diff --git a/docs/ref/contrib/gis/model-api.txt b/docs/ref/contrib/gis/model-api.txt index 2f4a27bc64..2c41b368e0 100644 --- a/docs/ref/contrib/gis/model-api.txt +++ b/docs/ref/contrib/gis/model-api.txt @@ -107,10 +107,10 @@ a flat surface is a straight line, the shortest path between two points on a cur surface (such as the earth) is an *arc* of a `great circle`__. [#fnthematic]_ Thus, additional computation is required to obtain distances in planar units (e.g., kilometers and miles). Using a geographic coordinate system may introduce -complications for the developer later on. For example, PostGIS versions 1.4 -and below do not have the capability to perform distance calculations between -non-point geometries using geographic coordinate systems, e.g., constructing a -query to find all points within 5 miles of a county boundary stored as WGS84. +complications for the developer later on. For example, Spatialite does not have +the capability to perform distance calculations between geometries using +geographic coordinate systems, e.g. constructing a query to find all points +within 5 miles of a county boundary stored as WGS84. [#fndist]_ Portions of the earth's surface may projected onto a two-dimensional, or @@ -124,10 +124,9 @@ calculations. .. note:: If you wish to perform arbitrary distance queries using non-point - geometries in WGS84, consider upgrading to PostGIS 1.5. For - better performance, enable the :attr:`GeometryField.geography` - keyword so that :ref:`geography database type ` - is used instead. + geometries in WGS84 in PostGIS and you want decent performance, enable the + :attr:`GeometryField.geography` keyword so that :ref:`geography database + type ` is used instead. Additional Resources: