[Gdal-dev] ArcGrid to IMG conversion: huge file

[Markus Neteler]

So, here my report:

 gdal_translate -of HFA -co COMPRESSED=YES pop2000 pop2000.img

 du -h pop2000.*
 3.5G    pop2000.ige
 8.0K    pop2000.img

 gdal_translate -co COMPRESS=DEFLATE pop2000 pop2000.tif
 du -h pop2000.*
 92.0M    pop2000.tif

Clear decision :-)

Markus

On Thu, Mar 09, 2006 at 06:41:21PM +0100, Markus Neteler wrote:
> Thanks, Frank and Thom,
> 
>  I'll try.
> 
> Markus
> 
> On Thu, Mar 09, 2006 at 09:41:15AM -0500, Thom DeCarlo wrote:
> > Markus,
> > The IMG format doesn't support the concept of "NODATA", and by default does
> > not use compression. It does support ESRI-style run length encoding, but I
> > haven't seen it used much. You might do better converting to geotiff which
> > supports LZW compression and Frank has extended it to support a NODATA tag.
> > 
> > --
> > Thom DeCarlo
> > ------------------------------------------------------
> >            Experience is a wonderful thing
> > It allows you to recognize a mistake when you make it again.
> > 
> > > -----Original Message-----
> > > From: Markus Neteler
> > > Sent: Thursday, March 09, 2006 6:04 AM
> > > To: GDAL-dev list
> > > Subject: [Gdal-dev] ArcGrid to IMG conversion: huge file
> > > 
> > > Hi,
> > > 
> > > when converting the
> > >   Landscan Global Population 2000 Database
> > > from
> > >   http://www.fao.org/geonetwork/srv/en/metadata.show?id=1261
> > > 
> > [snip]
> > > 
> > > Apparently the NoData isn't passed to IMG.
> > > Is the created IMG file probably uncompressed
> > > which leads to this big file size?
> > > 
> > > Best regards
> > > 
> > >  Markus
> > > 
> > 
> > 
> > 
> 
> -- 
> Markus Neteler     <neteler itc it>       http://mpa.itc.it
> ITC-irst -  Centro per la Ricerca Scientifica e Tecnologica
> MPBA - Predictive Models for Biol. & Environ. Data Analysis
> Via Sommarive, 18        -       38050 Povo (Trento), Italy

-- 
Markus Neteler     <neteler itc it>       http://mpa.itc.it
ITC-irst -  Centro per la Ricerca Scientifica e Tecnologica
MPBA - Predictive Models for Biol. & Environ. Data Analysis
Via Sommarive, 18        -       38050 Povo (Trento), Italy