[Gvsig_english] raster iamge wrong band value

[Benjamin Ducke]

Have you tried updating the layer's band statistics after
importing the raster?

Ben

----- Original Message -----
> Thank you Guillermo and Vincent!
> 
> I guess Vincent might be right. The data source I am using can be
> found on the web at
> ftp://guestglobcover:Pir8Eefo@us-ext-nas.eo.esa.int/regional/07_Globcover_200412_200606_V2.2_Africa.zip
> I use the file GLOBCOVER_200412_200606_V2.2_Africa_Reg.tif from this
> package which is an 8 bit unsigned file format. It seems really that
> gvSIG is interpreting this as 8 bit signed.
> 
> I tried to convert is using GDAL to Eras IMG, but the effect remains.
> 
> Thank you.
> 
> Klaus
> 
> 
> -----Original Message-----
> From: gvsig_internacional-bounces at listserv.gva.es
> [mailto:gvsig_internacional-bounces at listserv.gva.es] On Behalf Of
> Guillermo Tamburini
> Sent: Wednesday, June 30, 2010 14:46
> To: Users and Developers mailing list
> Subject: Re: [Gvsig_english] raster iamge wrong band value
> 
> hi,
> 
> I have no idea what could be your problem. And i can not test with
> other softwares because I haven't it now.
> 
> Well, my only proposal is that you try to make sure that the different
> software are understanding the data in the same data type. Raster
> layers could be byte, float, integer... Or to export the data to other
> formats for testing if the result is always the same.
> 
> From gvSIG you could check the data type in the general tab of the
> layer proprieties. May be in ESRI and in that case you get only real
> positive numbers, and gvSIG is understanding numbers up and down the
> zero. In that case you would obtain the data moved a half to the
> negative values.
> 
> If you want you can send us some data example for testing it.
> 
> Best regards.
> 
> Mithoefer, Klaus wrote:
> > Dear List,
> >
> > I use globecover vegetation data. When I try to retrieve the band
> > value by using the information picker or assign values to a point
> > layer I get the wrong value (e.g. for lakes I get-46 instead of
> > 210). I compared this with ArcGIS and FWtools.
> >
> > I tried gvSIG 1.2, 1.9 and 2010 OADE with Geotif and Erdas IMG
> > format. They all do the same. What is the problem?
> >
> > Thank you,
> >
> > Klaus
> >
> > Klaus Mithöfer
> > Geographic Information Systems (GIS) Officer
> > icipe - International Centre of Insect Physiology and Ecology
> > P.O. Box 30772 - 00100
> > Nairobi, Kenya
> > Phone: +254-20-8632000, Extn. 2147
> > Fax: +254-20-8632001/2
> > Mobile: +254-724-308404
> > E-Mail: kmithoefer at icipe.org
> > web: www.icipe.org
> >
> >
> > ----------------------------------------------------------------------------
> > This position is supported by German development cooperation //
> > Centre for international Migration and Development -
> > http://www.cimonline.de/en/index.asp
> >
> > Klaus.mithoefer at cimonline.de
> >
> >
> > _______________________________________________ Gvsig_internacional
> > mailing list
> > Gvsig_internacional at listserv.gva.es
> > http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional
> >
> >
> >
> 
> 
> -- Guillermo Tamburini Beliveau
> Proyecto gvSIG
> Consellería de Infraestructuras y Transportes (GVA)
> Valencia (Spain)
> 
> 
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