It is my opinion that the WKT projection description in the metadata is
wrong. In WKT the ellipsoid is described by two parameters: the semi-major
axis and the inverse flattening. For a sphere the flattening is 0 and so the
inverse flattening is infinity. If the metadata is modified to read
SPHEROID["Sphere",6370997,"inf",AUTHORITY["EPSG","7035"]]
instead of
SPHEROID["Sphere",6370997,0,AUTHORITY["EPSG","7035"]]
then GRASS creates a valid PROJ_INFO file.
The problem can be worked around by editing the line b: -inf in the
PROJ_INFO to read either "b: 6370997" or "es: 0".
Perhaps we could change GRASS to accept 0 as well as "inf" as representing a
sphere to allow for other broken software if this is common. Suggestions /
opinions on the most appropriate course of action are welcome.
This is all very complicated and hard to get my ahead around so please
challenge/question this if it looks like I've made a mistake.
Paul
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