[Gdal-dev] floating point bug

[Maciek Sieczka]

Hello Frank

did you find the reason of troubles with FP ArcGrid I reported?

----- Original Message -----
From: "Maciek Sieczka" <werchowyna at pf.pl>
To: <gdal-dev at remotesensing.org>
Sent: Wednesday, May 12, 2004 8:15 PM
Subject: Re: [Gdal-dev] floating point bug


> Frank,
>
> > 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 an 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 file are attached in the arc.tgz. If you need a bigger one
please
> let me know.
>
> > GDAL does not support floating point ESRI bil files.  I don't know what
> > they put in the .hdr file to indicate floating point.  So the file is
> > misused as integer and all the values are crazy.  Can you provide the
> > .hdr file so can see if there are any clues it is floating point?
>
> I read the problem's solved but just in case included are the world and
> header files of my FP dem.bil.
>
> Cheers
> Maciek
>