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I have two types of image, one of them is a TRMM image with 0.25 degree cells and the other one is a MODIS image with 1 km spatial resolution. How can I change my TRMM image resolution to 1 km without GCP points?

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    What software do you have available? – Aaron Apr 12 '14 at 18:38
  • my software is Erdas imagine 9.1. – mozhdeh Apr 14 '14 at 5:41
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you can use gdal to do this if your input data is georeferenced, with gdalwarp

you will need to specify the output size (-tr 1000 1000), the resampling method (-r bilinear) and I guess the projection of MODIS as output ( -t_srs "+proj=sinu +lon_0=0 +x_0=0 +y_0=0 +a=6371007.181 +b=6371007.181 +units=m +no_defs" )

so it should look like this in command line

gdawarp -tr 1000 1000 -r bilinear -t_srs "+proj=sinu +lon_0=0 +x_0=0 +y_0=0 +a=6371007.181 +b=6371007.181 +units=m +no_defs" input_TRMM.tif output_TRMM.tif

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