[Qgis-user] Grid creation and export data to *.asc

Luciano La Sala lucianolasala at yahoo.com.ar
Fri Dec 21 09:38:13 PST 2012


Thank you Micha! I will do as you suggest. 

 

Cheers, 

 

Luciano  

 

De: Micha Silver [mailto:micha at arava.co.il] 
Enviado el: Friday, December 21, 2012 2:30 PM
Para: Luciano La Sala
CC: qgis-user at lists.osgeo.org
Asunto: Re: [Qgis-user] Grid creation and export data to *.asc

 

Hi Luciano

On 12/21/2012 5:30 PM, Luciano La Sala wrote:

Hello Folks, 

Sorry to re-send but I got no response and I am not sure why. If my question was not clear I can always rewrite it. Luciano 

 

Hello QGIS users, 

I have a raster image of human population counts (LandScan) of approximately 1 km resolution. I need to take each cell of the raster one by one and retrieve the population count for that cell. 

To do this, I was told to create a grid theme of population density - based on the grid themes specifying population counts and area.

Export population count and population density files from ArcView to *.asc files.

 

Since your Landscan grid is at resolution 1 km, then the population count and density (per sq km) should be the same.

Using the GRASS module r.out.xyz you can get an ASCII text file with three columns: X,Y,value. The X-Y are cell enters, and value would represent Population count.

 

I am not sure how to create the grid nor how to export pop count and density files to *.asc. Any tips? Thank you in advance! 

Luciano La Sala



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