[gdal-dev] Understanding gdal_rasterize

[Paul Meems]

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

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.
I would have expected I could set the cell size and the dimensions of the
resulting tiff file would be equal to the input shapefile.

I also tried creating an ASCII file so I could 'read' the values, but I
can't figure out how to create an ASCII file.

Any help will be much appreciated.

Thanks,

Paul
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