Hello,
I have installed grass 5 beta on linux. I have two sets of polygon data
and run some simple queries. After some difficulty, I have been able to
import the data ok.
My question is this...
After looking through all of the commands I cannot see how one asks
tyipical gis questions like give me all the entities withing a certain
distance of this point, associating two datasets using a
"point(centroid) in a polygon" type query.
Also where is the database aspect of the grass gis system? Does it have
one?
Are these things possible with grass?
Any help is greatly appreciated. Thanks in advance.
Thanks,
Robb Hill
Robb Hill wrote:
Hello,
I have installed grass 5 beta on linux. I have two sets of polygon data
and run some simple queries. After some difficulty, I have been able to
import the data ok.
My question is this...
After looking through all of the commands I cannot see how one asks
tyipical gis questions like give me all the entities withing a certain
distance of this point, associating two datasets using a
"point(centroid) in a polygon" type query.
Also where is the database aspect of the grass gis system? Does it have
one?
Are these things possible with grass?
They seem to amount to one question, which the web site covers if you
hunt around. There are several database and flat-field options, and you
can construct your own procedures with a little scripting and a DB
server to query. RIM, Postgres 6.3x, and a few others are currently
available among the installable modules (at least in 4.whatever I had
last). Postgres has object variable types which can be used intuitively
with GIS to construct vector files from data.
Any help is greatly appreciated. Thanks in advance.
Thanks,
Robb Hill
Hello,
I need to change the category-value with the label after importing a
Arc/Info polygon coverage with m.in.e00.
Thanks.
Dieter
I
> Hello,
>
> I have installed grass 5 beta on linux. I have two sets of polygon data
> and run some simple queries. After some difficulty, I have been able to
> import the data ok.
>
> My question is this...
>
> After looking through all of the commands I cannot see how one asks
> tyipical gis questions like give me all the entities withing a certain
> distance of this point, associating two datasets using a
> "point(centroid) in a polygon" type query.
>
> Also where is the database aspect of the grass gis system? Does it have
> one?
>
> Are these things possible with grass?
>
They seem to amount to one question, which the web site covers if you
hunt around. There are several database and flat-field options, and you
can construct your own procedures with a little scripting and a DB
server to query. RIM, Postgres 6.3x, and a few others are currently
available among the installable modules (at least in 4.whatever I had
last). Postgres has object variable types which can be used intuitively
with GIS to construct vector files from data.
> Any help is greatly appreciated. Thanks in advance.
>
> Thanks,
> Robb Hill
_____________________________________
Dieter Lehmann
State University of applied Sciences
Schelmenwasen 4-8
D-72622 Nuertingen, Germany
lehmann@fh-nuertingen.de
Phone: +49 (0) 7022 404 Ext. 192 or Ext. 152
Fax: +49 (0) 7022 404 Ext. 166
Hello grass-users,
.... sorry, the confusion mail.
I only hit the reply button and forgot to delete the old mail message
for my new mail (with other topic, of course).
Dieter
Hello,
I need to change the category-value with the label after importing a
Arc/Info polygon coverage with m.in.e00.
Thanks.
Dieter
I
> > Hello,
> >
> > I have installed grass 5 beta on linux. I have two sets of polygon data
> > and run some simple queries. After some difficulty, I have been able to
> > import the data ok.
> >
> > My question is this...
> >
> > After looking through all of the commands I cannot see how one asks
> > tyipical gis questions like give me all the entities withing a certain
> > distance of this point, associating two datasets using a
> > "point(centroid) in a polygon" type query.
> >
> > Also where is the database aspect of the grass gis system? Does it have
> > one?
> >
> > Are these things possible with grass?
> >
> They seem to amount to one question, which the web site covers if you
> hunt around. There are several database and flat-field options, and you
> can construct your own procedures with a little scripting and a DB
> server to query. RIM, Postgres 6.3x, and a few others are currently
> available among the installable modules (at least in 4.whatever I had
> last). Postgres has object variable types which can be used intuitively
> with GIS to construct vector files from data.
> > Any help is greatly appreciated. Thanks in advance.
> >
> > Thanks,
> > Robb Hill
_____________________________________
Dieter Lehmann
State University of applied Sciences
Schelmenwasen 4-8
D-72622 Nuertingen, Germany
lehmann@fh-nuertingen.de
Phone: +49 (0) 7022 404 Ext. 192 or Ext. 152
Fax: +49 (0) 7022 404 Ext. 166
Hi Dieter
This is quite simple. Take the category file ("cats" directory) and use
your favorite editor to turn it into a rules file for r.reclass.
1:4 becomes 1 = 4
2:7 2 = 7
3:4 3 = 4
etc.
Then,
r.reclass i=old_map o=new_map < rules_file
Regards,
-Malcolm Williamson
On Wed, 5 May 1999, DIETER LEHMANN wrote:
Hello,
I need to change the category-value with the label after importing a
Arc/Info polygon coverage with m.in.e00.
Thanks.
Dieter
_____________________________________
Dieter Lehmann
State University of applied Sciences
Schelmenwasen 4-8
D-72622 Nuertingen, Germany
lehmann@fh-nuertingen.de
Phone: +49 (0) 7022 404 Ext. 192 or Ext. 152
Fax: +49 (0) 7022 404 Ext. 166