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

Micha Silver Thu, 18 Dec 2014 11:37:10 -0800

The important information is the region settings. Please post the output of g.region -p.
Also r.info on the resulting raster will help.

Also note, as Tom mentioned, that you probably want to *interpolate* a continuous raster from the point values. Converting a point vector directly to a raster with v.to.rast will give you individual raster pixels with some value, and all the rest of the raster pixels with zero (or null).

On 12/18/2014 09:10 PM, BABITHA REDDY wrote:

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 <[email protected]> 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 <[email protected]> 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

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

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