[gdal-dev] feet converting to meters unexpectedly

[Rahkonen Jukka]

Hi,

I noticed that the survey foot is now deemed obsolete https://www.nist.gov/pml/us-surveyfoot since 1st 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?

-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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