[gdal-dev] Understanding gdal_rasterize

[Paul Meems]

Thanks Hermann for your explaination.

I probably made a typo because now the pixels have different colors/values
as I would expect.

Thanks,


Paul

 *Paul Meems *
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and forum moderator of MapWindow GIS.
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*
*


2013/10/21 Hermann Peifer <peifer at gmx.eu>

> On 2013-10-21 14:46, Paul Meems wrote:
>
>> I'm trying to understand how gdal_rasterize works.
>> As a test I'm trying to convert a shapefile with all counties of the USA
>> to a GeoTiff.
>> I've added a field to the shapefile called myID which is equal to the
>> shape number.
>> The goal is to create a tiff with each county its own value.
>>
>> This is my command:
>> gdal_rasterize -a myID -l counties -of GTiff -a_nodata -999 -ts 800 800
>> counties.shp GDALRasterizeTest.tif
>>
>>
> You could drop "-of GTiff" as GTiff is anyway the default format.
> "-a_nodata -999" makes most sense in combination with "-init -999".
> Anything else looks fine to me.
>
>
>  I'm having trouble understanding the -ts or -tr parameters.
>> Using the above command I get an 800*800 tiff which shows the USA, but
>> it looks like all pixels are the same color.
>>
>
> -ts obviously sets the output file size, to 800x800 pixels, as you noted
> yourself. Do all pixels also have the same *value* ?
>
> Hermann
>
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