I think these macros won't help you as they are designed to
facilitate importing red-green tga data which you didn't yet
manage to create at the desired resolution.

You didn't mention what the actual source of your height_field
data is. The supported formats for 16-bit height_fields in Povray
are either 16-bit PNG grayscale or red-green TGA.

As red green TGA is a POV-specific hack software which uses it is
sparse. You should however manage to find a way to get 16 bit PNG.
You may find the excellent ImageMagick suite helpful:

   http://www.imagemagick.org/script/index.php

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