v.in.arc: some doubts

GRASS GRASS user
1

Giovanna:

At 10:55 AM 12/27/96 MET, you wrote:

I'm trying to import arc/info ungenerate files in Grassland using v.in.arc

grass function, but I have some doubts:

1) where I have to store my arc/info ungenerate files? I mean, can I store

them everywhere if I write the whole path (ex.
c:/grassland/adamello/rivers.lin,..) ?

I am not familiar with GRASSLANDS, but with GRASS, you must put the ungenerate
files in a directory named "arc" in your mapset in order to import them.

do I need to write the file extensions (.lin, .txt, .pol, .lab)? Are these
file extensions rigth?
No, you do not have to add the extensions to the file names.

Importing line coverage type, I wrote the complete path both with or

without file extensions (.lin for arc/info ungenerate lines file and .txt
for arc/info label-text file) but result is:

"vinarc: Coverage type = line
cannot find ARC/INFO lines file (rivers)"

You probably have the file in the wrong place. Make a directory called arc
and put them there. Also, be sure to ungenerate as single precision.

2) Can the GRASS category column in label-text file be the same that the ID

number column in label-text file ?

Yes.

I offer GRASS support & will send you info on it in a seperate email.

Pat Luther

Every help is welcome.
Happy new year to everybody.

Giovanna Ranci Ortigosa
e-mail: ranci @quercia.elet.polimi.it

Pat Scarbrough Luther "Your dream is the gift of
AEgis Services Corporation your own soul. But if it's
P.O. Box 160 promise is to be fulfilled,
Clinton, TN 37717 you must turn your eyes from
Phone 423.457.8242 the world of men, and dare
FAX 423.457.8620 to fly among the stars....
Internet pluther@usit.net After all, we are born with
        wings". Robert Sexton

2

Hi Pat Luther,

After I import data from Arc/Info, then I did the v.support command to
the vector map which is generated from the v.in.arc process. If I saw
many "points to areas failed" message, how and what should I do to
correct this result?

The reason that I need to correct the error is: if I ignore these error,
and go ahead to convert the vector file to raster file, the resulted
raster file will not show those areas failed to be converted. Then I
will get an imcomplete raster map.

I use to try using v.digit command to LABEL the "problem" areas which
missed their label points, but I can't make it right. How can label an
area which is formed by many single lines?

Please help me to solve this problem. I am in the process of converting
a big city map from Arc/Info data to GRASS. And I encounter many
problems. One of them is data duplication.

The city map data is stored in the Arc/Info system, and was input by
eight people. Somehow during the data input process, some portion of
one people's job is duplicated with other co-worker's job. So after I
converted these eight sets of maps to GRASS, and tried to patch these
eight single pieces of maps together to be a complete city map, I found
I must cut off the duplicate portions first before I apply the v.patch
command.

So I cut off the duplicate protions by using v.digit command, then I
apply the v.patch command to patch maps together. The outlook of the
resulted vecter map looks correct, only some pieces of areas lost their
label points due to the "points to area failed" message.

Regards,

Blanca Huang