GRASS-to-Arc

[karen Bryant x6541]

Hello,

I had two vector files and one raster file in GRASS.
One vector file consisted of a county boundary 
extracted from TIGER/line files.  The other vector
file consisted of roads for the county also extracted
from TIGER/line files.  The raster consisted of 
buffers around certain cultural features which
had also originally been extracted from TIGER/line
files of the same county.

I did v.out.arc type=line on the two vector
files containing the county boundary and the roads.
I did r.poly -l on the cultural features buffer 
raster and then v.out.arc type=polygon on the 
resulting polygon vector file.

I put all of the .lin, .txt, .pol, and .lab files
created above in the ARC/INFO workspace for the county.
In ARC, I did generate with lines on the county 
boundary and the roads covers and generate with polys
on the cultural features buffer polygon cover.
I then did projectdefine (projection utm, units meters,
zone 17, and parameters) and build on all three covers.
I then did createlabels and build again on the cover of
cultural features buffers.

I wrote an aml to create a graphics file with all three
covers plotted together.  The roads and county boudary
were in register.  !!!! However, the cover with the 
buffers of cultural features was shifted to the north
and perhaps slightly to the east. !!!!

I killed the covers and repeated the process thinking
that perhaps I had made a mistake in specifying the zone
during projectdefine.  This did not correct the problem.

Then, I thought perhaps there was a problem with v.out.ascii
type=polygon.  So, I did r.out.ascii on the original buffer
raster in GRASS, changed the header so that ARC could use 
the file with asciigrid, and did asciigrid, projectdefine,
gridpoly, and build with poly.

When I created a plot with the two line covers and this
second polygon cover, the buffers of the cultural
features were shifted southward relative to the roads
and county boundary. !!!!

I am truly perplexed because I have previously done this
latter process with a 7.5-minute quadrangle and the 
quadrangle polygon cover was in register with the quadrangle
boundary line cover.

If anyone has any suggestions as to what the error in either
of my processes is, I would appreciate hearing from you.
I am using GRASS 4.1 and ARC/INFO 7.0.

Thanks in advance.

Karen Bryant