On 05/03/2011 09:11 AM, Hanlie Pretorius wrote:
Hi Maris,
Thanks, your suggestion worked. With the region's resolution set to
5m, I got some output.
Hi Maris:
Sorry for butting in on this, but I don't understand why the region
resolution should make any difference to v.to.rast??
Would you mind to explain?
Thanks,
Micha
Regards
Hanlie
2011/5/2, Maris Nartiss<[email protected]>:
g.region vect=contours_20m
Also 20x20m cells wouldn't be too large?!?
Maris.
2011/5/2, Hanlie Pretorius<[email protected]>:
Hi,
I'm working in GRASS 6.4.1 on Windows XP.
I want to use r.surf.contour to convert contour lines into a DEM.
However, I first need to convert my vector contour lines into raster
contour lines. My region is set to the contours_20m vector layer, with
a 20m resolution.
v.to.rast --overwrite input=contours_20m output=contours_20m use=attr
column=HEIGHT
Loading data...
Reading features...
Writing raster map...
Converted areas: 0 of 0
Converted points/lines: 1593 of 1593
v.to.rast complete.
r.info for the result is:
| Layer: contours_20m@CDNGI_DEM Date: Mon May 02 14:18:00 2011
| Mapset: CDNGI_DEM Login of Creator: hanlie
| Location: SA_Lo_29E
| DataBase: F:\grassdata
| Title: Labels ( contours_20m@CDNGI_DEM )
| Timestamp: none
|----------------------------------------------------------------------------
|
| Type of Map: raster Number of Categories: 0
| Data Type: DCELL
| Rows: 1772
| Columns: 1750
| Total Cells: 3101000
| Projection: Transverse Mercator
| N: -3121229.69982072 S: -3156672.30728643 Res:
20.00147148
| E: -32474.90929218 W: -67483.27873573 Res: 20.00478254
| Range of data: min = 1620 max = 2460
| Data Source:
| Vector Map: contours_20m@CDNGI_DEM in mapset CDNGI_DEM
| Original scale from vector map: 1:1
|
| Data Description:
| generated by v.to.rast
|
| Comments:
| v.to.rast input="contours_20m@CDNGI_DEM" layer=1
type="point,line,ar\
| ea" output="contours_20m@CDNGI_DEM" use="attr" column="HEIGHT"
value\
| =1 rows=4096
As you can see from the number of categories (0), there is no
information in this raster file.
Can someone perhaps help me figure out why this happens?
Thanks
Hanlie
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--
Micha Silver
Arava Development Co. +972-52-3665918
http://www.surfaces.co.il
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