[GRASS-user] Conversion from point data to raster in GRASS

BABITHA REDDY reddybabitha at gmail.com
Thu Dec 18 11:10:54 PST 2014


Hi,
I have to convert the vector(point) data into raster, I imported point data
into the GRASS and then used v.to.rast command to convert vector to raster
map, but the same problem: nothing is displayed on the display, and query
data is giving a value of zero in the map display.
If it is a problem with projection and region, please help me to resolve
this.
the point data's metadata is :
Name:            RGP_Before_2014_Wagner_s_80_E_of_Hwy_80_E_of_HWY_20_2013_ |
 | Mapset:          battu
  |
 | Location:        RedRiverValley
   |
 | Database:        /home/shared/research/GRASSDATA
  |
 | Title:
  |
 | Map scale:       1:1
  |
 | Name of creator: battu
  |
 | Organization:
   |
 | Source date:     Mon Dec 15 16:18:26 2014
   |
 | Timestamp (first layer): none
   |
 |----------------------------------------------------------------------------|
 | Map format:      native
   |
 |----------------------------------------------------------------------------|
 |   Type of map: vector (level: 2)
  |
 |
   |
 |   Number of points:       10182           Number of centroids:  0
   |
 |   Number of lines:        0               Number of boundaries: 0
   |
 |   Number of areas:        0               Number of islands:    0
   |
 |
   |
 |   Map is 3D:              No
  |
 |   Number of dblinks:      1
   |
 |
   |
 |   Projection: UTM (zone 14)
   |
 |
   |
 |               N:       46.98666723    S:       46.97957943
  |
 |               E:      -98.65789266    W:      -98.66294363
  |
 |
   |
 |   Digitization threshold: 0
   |
 |   Comment:
  |
 |
and
g.proj -p gives me the following:

-PROJ_INFO-------------------------------------------------
name       : Universal Transverse Mercator
proj       : utm
datum      : wgs84
ellps      : wgs84
zone       : 14
no_defs    : defined
-PROJ_UNITS------------------------------------------------
unit       : metre
units      : metres
meters     : 1


Could please anyone help me solve this issue. I need to generate raster
maps from given vector(point) data.

Thanks

On Tue, Dec 9, 2014 at 2:09 PM, Thomas Adams <tea3rd at gmail.com> wrote:
>
> Babitha,
>
> How did you do your vector point to raster interpolation; v.surf.bspline;
> v.surf.idw; v.krige,…? Did you use d.rast to display the raster map; do you
> have a MASK set; is your GRASS Region set correctly?
>
> Knowing your steps in more detail would be helpful…
>
> Tom
>
> On Tue, Dec 9, 2014 at 12:53 PM, BABITHA REDDY <reddybabitha at gmail.com>
> wrote:
>
>> Hi All,
>>
>> After converting a shape file(point) into raster using GRASS7, it is not
>> displaying  the converted raster map. When i query the raster map it is
>> displaying the value as 0, even though there are values.
>>
>> Please help how to solve this problem
>>
>> Thanks
>>
>> _______________________________________________
>> grass-user mailing list
>> grass-user at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/grass-user
>>
>
>
>
> --
>
>
>
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