[GRASS-user] How to retrieve raster pixel value over a vector point layer

[Micha Silver]

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 <helenaherrera1980 at gmail.com>
To: Micha Silver <micha at arava.co.il>
Cc: grass-user at 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 <micha at 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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