[Gvsig_english] raster iamge wrong band value

[Mithoefer, Klaus]

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
>
>  
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>   


-- 
Guillermo Tamburini Beliveau
Proyecto gvSIG 
Consellería de Infraestructuras y Transportes (GVA) 
Valencia (Spain) 
 

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