At first sight, I'd say that the ArcPy output is incorrect. The SRS
definition of its output doesn't match what you want since it has
PARAMETER["Latitude of natural origin",20,
ANGLEUNIT["degree",0.0174532925199433],
ID["EPSG",8801]],
PARAMETER["Longitude of natural origin",6378137,
ANGLEUNIT["degree",0.0174532925199433],
ID["EPSG",8802]],
PARAMETER["False easting",5,
LENGTHUNIT["metre",1],
ID["EPSG",8806]],
The "Longitude of natural origin" is completely wrong, and should be 5
given the PROJ.4 string you mentionned
And the the "False easting" should be 0.
The output of GDAL looks plausible.
Le 30/04/2024 à 00:00, Liyuneh Gebre a écrit :
Hi Even,
thank you for your response,
gdal version is: GDAL 3.6.4, released 2023/04/17
I got the defined target projection included in the link. yes, it's
geocentric and for further exploration the custom project
transformation file .gtf extension is also included.
https://u.pcloud.link/publink/show?code=kZj5wh0ZtFWXtI9UGjQiD6KXxn5A9hiWDpEX
On Mon, Apr 29, 2024 at 4:23 PM Even Rouault
<even.roua...@spatialys.com> wrote:
Hi,
it is difficult to help you with just the elements you've provided.
What could be helpful is:
- the output of gdalinfo on the input file
- the output of gdalinfo on the output file generate by ArcPy
- how you define the target projection in ArcPy
- the output of gdalinfo on the output file generate by GDAL
- links to all the above files
- the GDAL version you use
Totally blind guess: try to add "+towgs84=0,0,0 " in your -t_srs
PROJ string, to ask PROJ to consider that your target CRS datum
has the same center and axis orientation as WGS84 (and thus go to
geographic <--> geocentric conversion when changing datums).
Otherwise without datum shifts, PROJ will consider that
longitude,latitude coordinates of the geographic CRS underlying
the source and target CRS is the same.
Even
Le 29/04/2024 à 14:57, Liyuneh Gebre via gdal-dev a écrit :
Dear all,
I am requesting again if you kind have some responds or
direction, thank you
I have difficulties in accurately reprojecting a raster file to a
user-defined projection.
I used the following commands in gdal while the output is not
similar to arcpy results. kindly offer your guidance to achieve
the same result. The arcpy uses custom transformation and then
reprojection.
gdalwarp -t_srs '+proj=laea +a=6378137.0 +f=0.0 +pm=0 +x_0=0.0
+y_0=0.0 +lon_0=20.0 +lat_0=5.0 +units=m +axis=enu +no_defs'
-dstalpha -wo SOURCE_EXTRA=1000 -r nearest rain_in.bil
rain_projected.bil
/*Liyuneh Gebre*//, ////Associate Researcher///
/Ethiopian Institute of Agricultural Research,EIAR
/
/Cell Phone:+251 911858155
/
/linkedIn: https://www.linkedin.com/in/liyuneh-gebre-b842b440/
/
//skype:liyenew_1//
/Addis Ababa, Ethioipa/
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My software is free, but my time generally not.
--
/*Liyuneh Gebre*//, ////Associate Researcher///
/Ethiopian Institute of Agricultural Research,EIAR
/
/Cell Phone:+251 911858155
/
/linkedIn: https://www.linkedin.com/in/liyuneh-gebre-b842b440/
/
//skype:liyenew_1//
/Addis Ababa, Ethioipa/
--
http://www.spatialys.com
My software is free, but my time generally not.
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