[gdal-dev] feet converting to meters unexpectedly

[Kirk Waters - NOAA Federal]

It's not exactly that it is obsolete. A better way to think of it might be
that it will not be part of the state plane 2022 definitions, which won't
be out until about 2025. It will always be part of the state plane 1983
definitions.

Kirk


On Mon, Jan 9, 2023 at 2:23 PM Rahkonen Jukka <
jukka.rahkonen at maanmittauslaitos.fi> wrote:

> 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
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