Cannot Run Raster Calculation Using GDAL -


i having trouble running raster calculation through gdal. attempting convert raster db through equation below.

a = raster file

"10*log10(power(a,2))-83"

using gdal_calc looks following. 

c:\>gdal_calc.py -a "c:\users\moses\desktop\calc_test\test444.img"  --outfile="c:\users\moses\desktop\calc_test\test555.img"  --calc="10*log10(power(a,2))-83" --debug --overwrite

i have attempted in separate pieces. so, raise raster second power, log10 of result. each time recieve following error...

:1: runtimewarning: divide 0 encountered in log10

any idea on how might go resolving this?

thanks in advance potential help.

apparently of pixel values contain zeros. if take log10(0), returns -inf causes error.

try this:

c:\>gdal_calc.py -a "c:\users\moses\desktop\calc_test\test444.img" --outfile="c:\users\moses\desktop\calc_test\test555.img" --calc="10*log10(power(a+0.0001,2))-83" --debug --overwrite

or set 0 values na.


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