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

[Markus Neteler]

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