[GRASS5] projection-transformation

[Roger S. Miller]

Looking back at Markus' gif, I see that the digitized lines on the
northwest side of the image are offset to the east of the shoreline
data.  The digitized lines on the east side of the image are offset to
the south-southeast of the shoreline data.

That doesn't look to me like a scaling problem or a linear offset, it
looks like a rotation.  Odd.  The easiest explanation for a rotation is
if the map that your students digitized in arcinfo was incorrectly
registered.


Roger Miller
Lee Wilson and Associates


Michel Wurtz wrote:
> 
> Markus Neteler wrote:
> 
> > May there be a bug in m.in.e00 which I used for data import?
> 
> Well... m.in.e00 doesn't translate anything. It uses the
> scale factor in projection info if it is not 1.0.  A bug
> here may lead to a false scale (and a non uniform shift)
> 
> Did you look at the original e00 file ? (take in dig_att the
> attribute of the vector, and use it to search through
> the arc section of the e00 file : you should find the same
> lat/long values than in the grass vector file).
> 
> --
> Michel WURTZ - DIG - Maison de la télédétection
>                500, rue J.F. Breton
>                34093 MONTPELLIER Cedex 5
> 
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