[GRASS-user] vector points from DEM in regular spaces

GRASS GRASS user
1

/hello

I want to create vector points from DEM in regular spaces.
Say, in every 10 m, I want to pick height values from DEM and
create the vector map with db table.
As far as I see, ///v.random <cid:part1.09040903.01070903@deprem.gov.tr> makes in irregular spaces.

What do you offer me to do ?

regards//

//

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2

temiz wrote on 10/31/2007 10:36 AM:

/hello

I want to create vector points from DEM in regular spaces.
Say, in every 10 m, I want to pick height values from DEM and
create the vector map with db table.
As far as I see, ///v.random <cid:part1.09040903.01070903@deprem.gov.tr>
makes in irregular spaces.
  

Right.

What do you offer me to do ?

g.region ... to set region boundaries and coordinates,
r.to.vect with feature=point parameter

Spearfish example:
g.region -dp
r.to.vect elevation.dem out=elev feature=point
d.mon x0
d.vect elev
v.db.select elev
cat|value|label
1|1112|
2|1111|
3|1111|
4|1110|
...

The value column contains the elevation.

Markus

3

Markus Neteler wrote:

temiz wrote on 10/31/2007 10:36 AM:
  

/hello

I want to create vector points from DEM in regular spaces.
Say, in every 10 m, I want to pick height values from DEM and
create the vector map with db table.
As far as I see, ///v.random <cid:part1.09040903.01070903@deprem.gov.tr>
makes in irregular spaces.
  

Right.
  

What do you offer me to do ?
    

g.region ... to set region boundaries and coordinates,
r.to.vect with feature=point parameter

Spearfish example:
g.region -dp
r.to.vect elevation.dem out=elev feature=point
d.mon x0
d.vect elev
v.db.select elev
cat|value|label
1|1112|
2|1111|
3|1111|
4|1110|
...

The value column contains the elevation.

Markus

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thank you

I will try your way.
After I sent my mail.
I think I solved the problem with
r.stats -gn input=map1,dem ( it enables me to exclude null values and confide to my map features (map1) )
then I am trying to import resulting text file to grass.

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