Jan Jezek a écrit :
> According to question in users list (below) - I would like to fix the Krovak
> projection to be compatible with ESRI definition. Problem is that ESRI
> definition is solving the axis swapping by defining the X_scale, Y_Scale and
> XY_Plane_Rotation parameters like this:
>
> PARAMETER["X_Scale",-1.0],
> PARAMETER["Y_Scale”,1.0],
> PARAMETER["XY_Plane_Rotation",90.0]
>
> (...snip...)
>
> I can fix it by handling ESRI parameters directly in
> Krovak.transformNormalized method but maybe it can by solved more generally
> on higher level.
>
> Any idea on that?
It would be better to left the Krovak projection unchanged, and handle that as
an affine transform to be concatenated to the Krovak projection. The advantage
is that if further affine transform concatenations are needed (e.g. additional
axis changes, unit conversions, etc.), GeoTools know how to concatenate that
efficiently with an other affine transform, while it would not known how to
concatenate that with the handling code inside the Krovak projection.
We would need new code (something independant of Krovak projection) which
creates an AffineTransform2D instance from the above "X_Scale", "Y_Scale" and
"XY_Plane_Rotation" parameters. This affine transform would then be
concatenated
to the MapProjection (any projection, not limited to Krovak) using
ConcatenatedTransform.create(theProjection, theAffineTransform). This work
could
be done inside MapProjection.Provider directly. We would need to rename
createMathTransform as createMapProjection for all MapProjection.Provider, then
implement a new createMathTransform method which create the affine transform,
invoke createMapProjection and do the concatenation.
Martin
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