Once you've added columns for the pixell values to the point vector, then
you can, of course, display those attributes on your map.
--
Micha Silver
052-366-5918
-----Original message-----
From: Helena Herrera <helenaherrera1...@gmail.com>
To: Micha Silver <mi...@arava.co.il>
Cc: grass-user@lists.osgeo.org
Sent: Thu, 29 Mar 2012, 14:36:12 GMT+02:00
Subject: Re: [GRASS-user] How to retrieve raster pixel value over a vector
point layer
Hi
I was thinking in something much simpler like just printing Pixel values
next to Point ID.
I will give a try on your suggestions.
Thanks
2012/3/28 Micha Silver <mi...@arava.co.il>
On 03/28/2012 08:11 PM, Helena Herrera wrote:
Greetings
I have a raster layer and a vector point layer and I need to associate
pixel values with points:
When you say "associate" If you mean to add the raster values to a column
in the point vector attribute table, then v.what.rast is what you're
looking for.
1- pixel values that are over points;
2- 3x3 pixel neighbor pixel values over a point.
Create a new raster with r.neighbors then run v.what.rast again to upload
these 3x3 neighborhood values to another column in the point vector.
Is this possible do to in a more automatic way than query each by each
point?
Here are the steps:
v.db.addcol vector_map col="rast_val double, rast_val_3x3 double"
v.what.rast vector_map rast=raster_map col=rast_val
r.neighbors raster_map out=raster_map_3x3 # assumes averaging a 3x3
window
v.what.rast vector_map rast=raster_map_3x3 col=rast_val_3x3
Thanks
Regards
helena
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--
Micha Silver
GIS Consultant,
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