Comparing near-natural colour composite to LST (Land Surface Temperature) using GRASS

Next stage is comparing your land surface temperature map with near-natural colour composite using GRASS. We can do this by type this formula into command console:

Create (only for display) near-natural colour composite of Landsat7 ETM+

d.rgb red=L71107033_03320120314_B30@PERMANENT green=L71107033_03320120314_B20@PERMANENT blue=L71107033_03320120314_B10@PERMANENT

Now we can see white colour is for snow cover, green for vegetation, and clear characteristics for urban environment.

Start new map display, and then open your temp_celcius@PERMANENT, and then compare your images. Now we see clearly, the urban areas has higher surface temperatures than the other environment, such as mountain range and river networks.

You can also make RGB composite using different formula, this formula is to create file and save into your  working directory:

r.composite red=L71107033_03320120314_B30@PERMANENT green=L71107033_03320120314_B20@PERMANENT blue=L71107033_03320120314_B10@PERMANENT output=n-ncolor



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