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[1.11.x] Corrected docs regarding MySQL support of Length GIS function.

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Backport of 33421ed10c7d26a7692edf5ba95c98107b6b0a98 from master
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Sergey Fedoseev 2017-04-11 22:03:37 +05:00 committed by Tim Graham
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docs/ref/contrib/gis/functions.txt
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@ -346,19 +346,19 @@ Returns ``True`` if its value is a valid geometry and ``False`` otherwise.
<https://postgis.net/docs/ST_Length.html>`__, SpatiaLite <https://postgis.net/docs/ST_Length.html>`__, SpatiaLite
Accepts a single geographic linestring or multilinestring field or expression Accepts a single geographic linestring or multilinestring field or expression
and returns its length as an :class:`~django.contrib.gis.measure.Distance` and returns its length as a :class:`~django.contrib.gis.measure.Distance`
measure. On MySQL, a raw float value is returned when the coordinates measure.
are geodetic.
On PostGIS and SpatiaLite, when the coordinates are geodetic (angular), you can On PostGIS and SpatiaLite, when the coordinates are geodetic (angular), you can
specify if the calculation should be based on a simple sphere (less specify if the calculation should be based on a simple sphere (less
accurate, less resource-intensive) or on a spheroid (more accurate, more accurate, less resource-intensive) or on a spheroid (more accurate, more
resource-intensive) with the ``spheroid`` keyword argument. resource-intensive) with the ``spheroid`` keyword argument.
MySQL doesn't support length calculations on geographic SRSes.
.. versionchanged:: 1.11 .. versionchanged:: 1.11
In older versions, a raw value was returned on MySQL when used on In older versions, a raw value was returned on MySQL.
projected SRS.
``MakeValid`` ``MakeValid``
============= =============