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Reprojecting Raster Data

When working with geographic data, it is important to work in the same projection. We can use the gdal_warp command to reproject a raster dataset. NOTE: reprojecting raster data should be done with caution since the size of the pixels can change depending on the projection being used.

gdalwarp -t_srs "EPSG:XXXX" input.tif output.tif

where:

• -t_srs this is the projection you want the input file to be projected to
• EPSG:XXXX this is the EPSG code you want to reproject your raster to.
• input.tif this is the input file
• output.tif this is the output file

Be sure to add -r bilinear if reprojecting elevation data to prevent funky banding artifacts.

Let's reproject our SF raster data to the EPSG:26910 which is the UTM zone 10N:

gdalwarp -t_srs "EPSG:26910" sf_4269.tif sf_utm10n.tif