[GRASS-user] question about v.to.rast

[吉藤奈津子]

Hello.

I have some trouble in using v.to.rast.
Could anyone help me, please?

I imported ascii vector data (position data) using v.in.ascii, then
converted it into raster data using v.to.rast as follows;

v.in.ascii input=test.txt output=test x=2 y=1 z=3 columns='x double
precision, y double precision, z double precision' -z
v.to.rast input=test output=test0 use=z

I succeeded to import ascii vector data by v.in.ascii.
However,  when I comverted vector to raster, the position of raster
data was not in the right place.
A little moved. If I displayed both vector data and comverted raster
data, the vector position data was not shown within the corresponding
pixel of raster.
How can I solve this problem?

Information about my setting is as follows.

projection: 3 (Latitude-Longitude)
zone:       0
datum:      wgs84
ellipsoid:  wgs84
north:      29:00:16.07148N
south:      4:59:43.928556N
west:       91:59:43.92852E
east:       110:00:16.0704E
nsres:      0:00:32.142857
ewres:      0:00:32.142857
rows:       2689
cols:       2017
cells:      5423713

A part of imported ascii vector data:
19.3|97.83333333|1.1111
18.16666667|97.93333333|2.1111
19.91666667|99.83333333|3.1111
19.13333333|99.9|4.1111
18.78333333|98.98333333|5.1111
(latitude | longitude | data)

I hope someones's kind help.
I wish you all happy new year!

Natsuko

-- 
----------------------------------------------------------
YOSHIFUJI Natsuko
Faculty of Agriculture
Kyushu University
E-mail:natsuko at forest.kyushu-u.ac.jp
----------------------------------------------------------