[gdal-dev] feet converting to meters unexpectedly

[Even Rouault]

Le 09/01/2023 à 20:22, Rahkonen Jukka a écrit :
>
> Hi,
>
> I noticed that the survey foot is now deemed obsolete 
> https://www.nist.gov/pml/us-surveyfoot since 1^st of January. 
> Should/could there be warnings in GDAL/Proj about that? Or will also 
> the corresponding entries in the EPSG database become obsolete in time?
>
The US government rightly wants to fix the future, but it can't fix the 
past. I bet that the use of CRS using US Survey Foot will outlive all of 
us. IMHO, I don't think it is GDAL/Proj responsibility to do anything 
special regarding that. Probably that tagging those CRS in the EPSG 
database will indeed be the next action, but I believe this should be 
with care as it could have surprising effects. Probably the supersession 
mechanism would be more appropriate than deprecation (deprecation in 
EPSG is often used to tag broken entries. there is nothing broken with 
US Survey Foot)

Even

> -Jukka Rahkonen-
>
> *Lähettäjä:*gdal-dev <gdal-dev-bounces at lists.osgeo.org> *Puolesta 
> *Even Rouault
> *Lähetetty:* maanantai 9. tammikuuta 2023 21.10
> *Vastaanottaja:* Kirk Waters - NOAA Federal <kirk.waters at noaa.gov>; 
> gdal-dev at lists.osgeo.org
> *Aihe:* Re: [gdal-dev] feet converting to meters unexpectedly
>
> Hi,
>
> This is indeed https://github.com/OSGeo/gdal/issues/6839 
> <https://eur06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FOSGeo%2Fgdal%2Fissues%2F6839&data=05%7C01%7Cjukka.rahkonen%40maanmittauslaitos.fi%7Cff99c3d359784e7f45ce08daf2752dad%7Cc4f8a63255804a1c92371d5a571b71fa%7C0%7C1%7C638088882332787798%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=50fmqgZrGZQQdpKoc1fOlTL0yhI2z1Wf9Dabs0KwExs%3D&reserved=0> 
> which has been fixed in GDAL 3.6.1.
>
> Even
>
> Le 09/01/2023 à 19:48, Kirk Waters - NOAA Federal via gdal-dev a écrit :
>
>     I think I've gotten this solved for my purposes now, but I'm
>     reporting it here in case anyone else might run across issues
>     using gdal in a conda environment. If I make a conda environment
>     containing:
>
>     python
>
>     pdal=2.4.2
>
>     gdal
>
>     (which ends up with gdal version 3.5.1, pdal version 2.4.2), I get
>     a weird behavior where
>
>     gdalwarp input.tif output.tif
>
>     will change the values in the raster as if it is converting from
>     feet to meters. My example raster where I see this has
>     georeferencing of EPSG:3521+6360 and is a 32-bit floating point
>     DEM. My use case would have more arguments to gdalwarp, but I
>     simplified to the minimum that showed the problem.
>
>     If I change the environment package list for conda to not specify
>     the pdal version, I'll get pdal version 2.4.3 and gdal version
>     3.6.2 and the raster will convert correctly.
>
>     I did note that in a setup where it converts the values, I see
>     this warning:
>
>     Warning 1: Unknown units=US survey foot
>
>
>     Kirk Waters, PhD
>
>     NOAA Office for Coastal Management
>
>     Applied Sciences Program
>
>     ‪Phone: 843-284-6962 (New as of 2022)
>
>     coast.noaa.gov/digitalcoast
>     <https://eur06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fcoast.noaa.gov%2Fdigitalcoast&data=05%7C01%7Cjukka.rahkonen%40maanmittauslaitos.fi%7Cff99c3d359784e7f45ce08daf2752dad%7Cc4f8a63255804a1c92371d5a571b71fa%7C0%7C1%7C638088882332787798%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=mFBiuSZzlkEop5b4qQLEcKr1Xmmmu1sGw0NxxOE0dj4%3D&reserved=0>
>
>
>
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