venn at geo.vu.nl
Tue Nov 30 11:50:01 EST 1993
> I am trying to export Grass vector files (areas) to ARC/INFO. I run v.out.arc in order to create 3 ASCII files: prefix.pol, prefix.lab and prefix.txt
> I followed GRASS manual and I can use prefix.pol and prefix.lab to create, with
> generate command, a coverage, but I do not know to put prefix.txt (containing
> categories and attributes information) into the created coverage in ARC/INFO.
> I would appreciate any help, thanks
> Juan M. Ruiz
I'm afraid I can't help you with running arc/info commands but a word of
caution with respect to v.out.arc:
1) It is alpha code, meaning the program is not yet fully tested
2) I made the following change in the file write.c
fprintf (fp, "%12.2lf %12.2lf\n", Xptr[i], Yptr[i]);
fprintf (fp, "%12.6lf %12.6lf\n", Xptr[i], Yptr[i]);
The reason for this is that we were doing a project in Mauretania
and had to supply the data to an engineering company (arc/info
format). Our data was in latitude/longitude format. In Mauretania 1
degree EW is approx 100km. The first form (12.2) would give us an
accuracy of approx 1km, while the data was gathered with a GPS (approx
25-50m if I recall correctly).
The results looked good, or did we make the horrible mistake of using
v.out.arc in the wrong projection (lat/lon)?
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