[Qgis-user] Rasterize vector

[David J. Bakeman]

On 10/23/2012 10:10 AM, Luciano La Sala wrote:
> Dear QGIS experts, 
>
> I am using QGIS V. 1.8.0. and I have a shapefile of Argentina which I need
> to convert to raster. I looks as a pretty straightforward process, but along
> the way I hit the following problem:
>
> 1) Once the vector file is loaded, I go to Raster >> Conversion >> Rasterize
> (Vector to raster)
> 2) I select the output file but the following message pops up: "The output
> file doesn't exist. You must set up the output size to create it."
> 3) I hit Ok and then I am left to decide what size do I want for the output
> file. The default values are Width = 3000 and Height = 3000.
>
> So at this point my questions are: 
>
> a) What are these values for width and height? What do they represent? After
> conversion, I load the raster and under properties and metadata tab it says
> that dimensions of raster are X: 3000 Y: 3000 Bands: 1, but I am not sure
> what this means. 
Those values represent the number of pixels in the X and Y direction.

So if your original vector file represents 10km by 10km then each pixel
represents 3.33333m.
> Thank you in advance for your help. 
>
> Luciano          
>
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