Michal,
This may be becuase of an issue with the conda-forge install of pyproj. The
grid shift files do not get installed.
Please see this thread for details:
NAD27 to NAD83 Conversions · pyproj4 pyproj · Discussion #1409
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NAD27 to NAD83 Conversions · pyproj4 pyproj · Discussion #1409
In previous versions of pyproj, I was able to convert points between different
datums. Specifically, NAD27 to NAD83 with both geographic and Cartesian
coordinates. Is there a setting that needs to ...
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David
Sent from Yahoo Mail
On pyproj4 pyproj6, 2024, 6:58 AM, Michal Girmala via gdal-dev
<gdal-dev@lists.osgeo.org> wrote:
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Hello all,
I am trying to reproject elevation raster with gdalwarp in python Gdal API
using a transformation defined by -ct string
kwargs = {
"format": 'GTiff',
"resampleAlg": "cubic",
"multithread":True
}
kwargs.update({"coordinateOperation":"+proj=pipeline +step +inv +proj=utm
+zone=34 +ellps=GRS80 +step +proj=push +v_3 +step +proj=cart +ellps=GRS80 +step
+inv +proj=helmert +x=485.021 +y=169.465 +z=483.839 +rx=-7.786342 +ry=-4.397554
+rz=-4.102655 +s=0 +convention=coordinate_frame +step +inv +proj=cart
+ellps=bessel +step +proj=pop +v_3 +step +proj=hgridshift
+grids=.\\pipeline\\Slovakia_JTSK03_to_JTSK.gsb +step +proj=vgridshift
+grids=.\\pipeline\\Slovakia_ETRS89h_to_Baltic1957.gtx +step +proj=krovak
+lat_0=49.5 +lon_0=24.8333333333333 +alpha=30.2881397527778 +k=0.9999 +x_0=0
+y_0=0 +ellps=bessel" })
kwargs.update({"srcSRS":"EPSG:25834","dstSRS":"EPSG:5514"})
warp = gdal.Warp(out_raster,in_raster,**kwargs)
The horizontal reprojection works fine but I can´t force the Gdal to use an
elevation shift grid file, because my CRS does not have a vertical system
defined.
In the Gdal utility, I can easily do this by using -vshift parameter, but I
don´t know how to do this with Python API since osgeo.gdal.WarpOptions does not
contain this parameter.
Is there a way, how to force vertical transformation?
Thank you.
Best regards,
Ing. Michal Girmala
+421 908 133 793 girm...@photomap.sk
+421 55 685 4396 www.photomap.sk
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