[gdal-dev] HFA_USE_RRD vs USE_RRD

[Maciej Sieczka]

Hi!

If I use the followiwng syntax:

  gdaladdo --config HFA_USE_RRD YES --config USE_RRD YES some.tif 2 4 8

a small aux file and a big rrd file are created. If I use:

  gdaladdo --config USE_RRD YES some.tif 2 4 8

only a big aux is created.

In the 1st case the sum of aux and rrd file sizes is equal the size of
the aux file from the 2nd case.

What is the difference between the 2 methods, is any better (in what
terms) and could gdaladdo man page please address these issues
(currently it only mentions USE_RRD alone).

Maciek

-- 
Maciej Sieczka
www.sieczka.org