[Gdal-dev] floating point bug
werchowyna at pf.pl
Mon May 31 05:04:12 EDT 2004
> Sorry, I don't recall the details. What that the one that was really a
> BIL file, and GDAL didn't support floating point BIL files? That
> was resolved by assuming that 32bit files were floating point. If it
> was really an arc/grid binary grid coverage, could you provide it
The problem with BIL occured "by the way" when I was trying to
walkover my problem.
The MAIN issue is: FP ArcGrid support in GDAL is faulty IMHO.
below goes our most recent email on this subject
a sample of the problematic file is attached
>> I find it hard to believe that GDAL's AIG driver would misreport a
>> floating point Arc/Info Binary Grid as Int16. If you can provide a
>> sample Arc/Info grid that demonstrates this problem I will investigate.
> I digged a little more and I'm confused.
> I noticed that whether GDAL recognises the FP ARCGrid as FP or INT
> depends somehow on the proportion and distribution of null/data
> cells in a file but I can't find a simple rule for this (and I may be
> wrong as well). Anyway if the FP grid file is "100% data" it is always
> recognised as FP. But if it contains nulls then GDAL will see it as INT or
> FP dependending on the file itself. Examples for both cases taken out from
> my FP ARCGrid are attached in the arc.tgz. If you need a bigger one please
> let me know. BOTH shold be FLOATING POINT while only ONE is recognised
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