.. _-d_full:

**-d**\ [**i**\ \|\ **o**]\ *nodata*
    Control how user-coded missing data values are translated to official
    NaN values in GMT.  For input data we replace any value that equals
    *nodata* with NaN. For output data we replace any NaN with the chosen
    *nodata* value.  Use **-di** or **-do** to only affect input or output.
    
