Le 10/01/2024 à 18:52, Meyer, Jesse R. (GSFC-618.0)[SCIENCE SYSTEMS AND
APPLICATIONS INC] a écrit :
Thanks Even, we’ll try that.
Are there any known integer values that ESRI and EPSG conflate? If
not, it would be convenient to simply pass in an integer to a single
API function and be done with it.
I believe not. Codes in the [1,32767] range should lead to equivalent
definitions under both authorities. But when they are really the same,
to save space and confusion to users, they are not imported under the
ESRI authority and are only available under the EPSG ones. So codes in
the [1,32767] under the ESRI authorities are basically for CRS names
that are slightly different spelled by ESRI (but otherwise with a
definition compatible of the EPSG one). There are also very ancient
deprecated CRS that were imported from EPSG, but were deprecated by EPSG
so long ago that they are not in the EPSG database anymore (like
https://spatialreference.org/ref/esri/31491/).
But there's no only EPSG and ESRI in life :-) The IAU authority for
example uses numeric code in the ranges of what could be used by EPSG or
ESRI.
So it is really the tuple (authority_name,code) that conveys a primary key.
Jesse
*From: *Even Rouault <even.roua...@spatialys.com>
*Date: *Wednesday, January 10, 2024 at 12:48 PM
*To: *"Meyer, Jesse R. (GSFC-618.0)[SCIENCE SYSTEMS AND APPLICATIONS
INC]" <jesse.r.me...@nasa.gov>, "gdal-dev@lists.osgeo.org"
<gdal-dev@lists.osgeo.org>
*Subject: *[EXTERNAL] Re: [gdal-dev] Lack of srs importFromESRI
integer function
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Jesse,
You can use SetFromUserInput("ESRI:XXXX") . ImportFromEPSG(code) more
or less does SetFromUserInput("EPSG:{code}")
Even
Le 10/01/2024 à 18:44, Meyer, Jesse R. (GSFC-618.0)[SCIENCE SYSTEMS
AND APPLICATIONS INC] via gdal-dev a écrit :
Hi,
Our team has moved away from providing geographic / projected CRS
codes as strings and prefer using integers where possible.
However, in the C++ API, I only see an integer based
importFromEPSG function, which doesn’t appear to accept ESRI codes
(crs not found error message). We’re targeting an Albers
projection which is distinguished by an ESRI integer.
Curiously, the proj database doesn’t seem to make this distinction
– the table column is simply ‘code’ and I can find the projection
row manually, alongside EPSG projections.
Can such a function be provided by the API (if it doesn’t already
exist – I couldn’t find it – there are no integer overloads of
importFromESRI)?
Please advise -- thanks,
Jesse
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