Jason Cox wrote:
> Geoff,
>       sorry for the double post, but I thought I had issues with my old and
> new email address.
> Anyway,the original hgt source was from
> e0srp01u.ecs.nasa.gov/srtm/version2/Australia
> This was 'wget' from the site back '06 and unfortunatly not available
> now. I am cutting up the hgt file with 'gtchop 1 HGT/S38E150.hgt
> SRTM2-Australia-3/' and it shows no errors.

There's your problem - the data is 3 arcsec, not 1, so effectively 
you've shrunk it to 1/3 of its original size. Re-run hgtchop with 3 
instead of 1.

Jon


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