Stefano,
urn:ogc:def:coordinateOperation:EPSG::1169 is a transformation between
EPSG:4265 (the geographic CRS of Monte Mario) and EPSG:4326. You cannot
use it directly when the source CRS is EPSG:3003, which is a projected
CRS based on EPSG:4265.
You could instead use
options.SetOperation("""+proj=pipeline
+step +inv +proj=tmerc +lat_0=0 +lon_0=9 +k=0.9996 +x_0=1500000 +y_0=0
+ellps=intl
+step +proj=push +v_3
+step +proj=cart +ellps=intl
+step +proj=helmert +x=-225 +y=-65 +z=9
+step +inv +proj=cart +ellps=WGS84
+step +proj=pop +v_3
+step +proj=unitconvert +xy_in=rad +xy_out=deg
+step +proj=axisswap +order=2,1""")
as suggested by the output of projinfo -s EPSG:3003 -t EPSG:4326
--spatial-test intersects
Even
Le 05/03/2021 à 09:42, Stefano Iacovella a écrit :
Hi all,
I am trying to use GDAL, via Python bindings, to convert coordinates.
I would like to select a specific transformation when converting among
CRS with different Datums. Reading the documentation my understanding
is that I need to create a osr.CoordinateTransformation with options
parameter valorized properly.
I am using binaries from OSGEO4WIN, the release are 3.1.4 for GDAL and
6.3.2 for PROJ
This is a code snippet I am using to debug:
from osgeo import ogr
from osgeo import osr
source = osr.SpatialReference()
source.ImportFromEPSG(3003)
target = osr.SpatialReference()
target.ImportFromEPSG(4326)
options = osr.CoordinateTransformationOptions()
options.SetOperation("urn:ogc:def:coordinateOperation:EPSG::1169")
transform = osr.CoordinateTransformation(source, target, options)
point = ogr.CreateGeometryFromWkt("POINT (1622987 4756952)")
point.Transform(transform)
print point.ExportToWkt()
I have no errors running it but the coordinates of the point, after
the transformation, are infinite. If I create the
CoordinateTransformation without options like this:
transform = osr.CoordinateTransformation(source, target)
The point coordinates after transformation are ok but of course the
conversion is performed using the Coordinate Operation automatically
selected by the system.
Am I doing something wrong?
Thank you in advance for your help.
All the best,
Stefano
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