Loïc MAZE a écrit :
I have just received an email from the EPSG concerning my request. It
seems that the EPSG doesn't want to modify the database... Here's the
content :
"Although direct methods to transform projected coordinates on one datum
to/from geographic coordinates on another datum are possible, they are
rarely used and to the best of our knowledge not available for France.
The recommended method is two steps: firstly a conversion from projected
CRS on datum 1 to geographic coordinates on datum 1, then secondly a
transformation from geographic coordinates on datum 1 to geographic
coordinates on datum 2.
This second step may itself be several steps, through geocentric
coordinates, as dictated by the transformation method. The concatenation
of the steps happens in software."
Sound like a misunderstanding.
I guess that the request was about a transformation method from EPSG:27572 to EPSG:4326. The EPSG
answer is right: they do not provide transformations from a ProjectedCRS to a GeographicCRS, and
Geotools should not need that. The request should have been for a transformation method from
EPSG:4807 (the base GeographicCRS EPSG:27572 is based on) to EPSG:4326. Actually I should have
looked at the EPSG:27572's baseCRS first in order to help you, but missed time (too many things to
do...)
Just verified in the EPSG database, and found an operation method from EPSG:4807 to EPSG:4326. I'm
not sure why Geotools didn't found it. Could you open a JIRA task with the Geotools version you are
using and a small test case please?
Martin.
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