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I have read the gdal documentation for gdal_rasterize. As well as reading the original forum that established -tap (target aligned pixels). I understand -tap is used to make a standard grid (maybe like ArcGIS snap raster) but I do not understand the usage.

When I use gdal_rasterize and I enter -tap what is -tap aactually doing to the ouput raster?

I do not seem to be able to point -tap to another raster to use this grid and I do not seem to be able to enter origin coordinates. Gdal_rasterize appears to want me to enter only -tap with no following argument. My assumption is it aligns with 0,0 but this is a guess.

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-tap just aligns the grid to the resolution. So, if the resolution is 2m, the cells are aligned to round multiples of 2.

  • Thanks, I was looking for something like a snap raster setting in gdal_rasterize. – If you do not know- just GIS Oct 6 '15 at 13:08
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    I don't think -tap would work because, for example, you couldn't snap the grid to a fraction if the resolution was an integer. You can use the -te flag to explicitly set the extent, along with -tr to set the resolution. You can get the snap extent from the snap raster using gdalinfo. A pain, I know. In GRASS, you can just set the region by the snap raster, but GDAL isn't meant to be a full GIS. – Rob Skelly Oct 6 '15 at 16:17

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