I see below that your vector has 10,182 points. This raster has
62,264,281 raster cells. So in the raster you have about 6000 cells with
no value (0) for each 1 with some value. I would guess that if you zoom
in very close to some points in the original vector, you will see that
those raster cells have a value.
And again, you most likely should consider some interpolation method.
On 12/18/2014 10:35 PM, BABITHA REDDY wrote:
Hi,
The following output i got, for vector converted to raster and for
that raster i used r.info <http://r.info>
r.info <http://r.info> -g -e map=vtr@battu
north=5373915
south=5135385
east=642315
west=407385
nsres=30
ewres=30
rows=7951
cols=7831
cells=62264281
datatype=DCELL
title="Categories (vtr)"
units="none"
vertical_datum="none"
source1="Vector Map:
RGP_Before_2014_Wagner_s_80_E_of_Hwy_80_E_of_HWY_20_2013_Harvesting_Corn_Harvest_Corn@battu"
source2="Original scale from vector map: 1:1"
description="generated by v.to.rast"
timestamp="none"
On Thu, Dec 18, 2014 at 1:29 PM, Micha Silver <[email protected]
<mailto:[email protected]>> wrote:
The important information is the region settings. Please post the
output of g.region -p.
Also r.info <http://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]
<mailto:[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] <mailto:[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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