[GRASS-user] "v.transform" reports erroneous values in the transformation matrix

[José María Michia Roberts]

Hi all!

I've found that values of transformation matrix reported by
v.transform are erroneous after using this values in ST_Affine (a
PostGIS's function).

The values that seems to be erroneous are x_offset and y_offset. The
rotation values seems to are fine.

The transformed elements are ok (it is, their coordinates are in the
right place).

Values reported by v.transform:

xoff = -139153.031250
yoff = 8352534.450195

The correct values must be (aproximately):

xoff = 5461371
yoff = 6321181

The complete session's log with one test element is there (same
results with a whole layer):

http://pastebin.com/FUtnePvb

Local map: tmp
Transformed map: tmp_geo

Take a look at the map region for tmp/tmp_geo (reported by v.info),
and compare these values with those of x_off / y_off (reported by
v.transform).

Maybe I'm not interpreting this correctly.

Thanks all!
Jose