[gdal-dev] [EXTERNAL] Re: Lack of srs importFromESRI integer function

Wed Jan 10 10:06:43 PST 2024

Thanks for the helpful background, Even.

Jesse

From: Even Rouault <even.rouault at spatialys.com>
Date: Wednesday, January 10, 2024 at 1:01 PM
To: "Meyer, Jesse R. (GSFC-618.0)[SCIENCE SYSTEMS AND APPLICATIONS INC]" <jesse.r.meyer at nasa.gov>, "gdal-dev at lists.osgeo.org" <gdal-dev at lists.osgeo.org>
Subject: Re: [EXTERNAL] Re: [gdal-dev] Lack of srs importFromESRI integer function

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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.rouault at spatialys.com><mailto:even.rouault at 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.meyer at nasa.gov><mailto:jesse.r.meyer at nasa.gov>, "gdal-dev at lists.osgeo.org"<mailto:gdal-dev at lists.osgeo.org> <gdal-dev at lists.osgeo.org><mailto:gdal-dev at 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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