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Diffstat (limited to 'docs/source/development/reference')
| -rw-r--r-- | docs/source/development/reference/functions.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/docs/source/development/reference/functions.rst b/docs/source/development/reference/functions.rst index 87271117..4052ff82 100644 --- a/docs/source/development/reference/functions.rst +++ b/docs/source/development/reference/functions.rst @@ -108,11 +108,20 @@ paragraph for more details. When using that syntax, the axis order and unit for geographic CRS will be longitude, latitude, and the unit degrees. + - the name of a CRS as found in the PROJ database, e.g "WGS84", "NAD27", etc. + - more generally any string accepted by :c:func:`proj_create` An "area of use" can be specified in area. When it is supplied, the more accurate transformation between two given systems can be chosen. + When no area of use is specific and several coordinate operations are possible + depending on the area of use, this function will internally store those + candidate coordinate operations in the return PJ object. Each subsequent + coordinate transformation done with :c:func:`proj_trans` will then select + the appropriate coordinate operation by comparing the input coordinates with + the area of use of the candidate coordinate operations. + Example call: .. code-block:: C |