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Diffstat (limited to 'docs/source/development/reference/functions.rst')
| -rw-r--r-- | docs/source/development/reference/functions.rst | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/docs/source/development/reference/functions.rst b/docs/source/development/reference/functions.rst index 00653ad9..aa177b31 100644 --- a/docs/source/development/reference/functions.rst +++ b/docs/source/development/reference/functions.rst @@ -29,9 +29,17 @@ paragraph for more details. .. c:function:: PJ* proj_create(PJ_CONTEXT *ctx, const char *definition) - Create a transformation object, or a CRS object, from a proj-string, - a WKT string, or object code (like "EPSG:4326", "urn:ogc:def:crs:EPSG::4326", - "urn:ogc:def:coordinateOperation:EPSG::1671"). + Create a transformation object, or a CRS object, from: + + - a proj-string, + - a WKT string, + - an object code (like "EPSG:4326", "urn:ogc:def:crs:EPSG::4326", + "urn:ogc:def:coordinateOperation:EPSG::1671"), + - a OGC URN combining references for compound coordinate reference systems + (e.g "urn:ogc:def:crs,crs:EPSG::2393,crs:EPSG::5717" or custom abbreviated + syntax "EPSG:2393+5717"), + - a OGC URN combining references for concatenated operations + (e.g. "urn:ogc:def:coordinateOperation,coordinateOperation:EPSG::3895,coordinateOperation:EPSG::1618") Example call: @@ -110,7 +118,8 @@ paragraph for more details. - 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` + - more generally any string accepted by :c:func:`proj_create` representing + a CRS An "area of use" can be specified in area. When it is supplied, the more accurate transformation between two given systems can be chosen. |