[Gvsig_english] raster iamge wrong band value

Wed Jul 7 08:29:14 CEST 2010

Dear Guilermo,

Thank you for your email. I have tried gvSIG, ESRI ArcGIS and software which uses GDAL libraries such as FWtools. Its only gvSIg which produces wrong results. The data type is byte(gvSIG) and according to ArcGIS 8 Bit unsigned integer which is to me generally the same but more detailed information.

However, I can off course work around that but to be honest it seems it is a bug in gvSIG. If I can’t trust a software that it is able to read a file correctly (and it is a simple tif file public domain land cover data.

Thank you also for sending me the picture but it only showed the landcover. Water bodies for example should have value 210.

Again, thanks for your comments! That’s well appreciated.

Klaus

From: gvsig_internacional-bounces at listserv.gva.es [mailto:gvsig_internacional-bounces at listserv.gva.es] On Behalf Of Guillermo Tamburini
Sent: Monday, July 05, 2010 09:30
To: Users and Developers mailing list
Subject: Re: [Gvsig_english] raster iamge wrong band value

Sorry but,

did you check my last proposal? Or was I wrong?

This is an example of my result.

Regards.

Mithoefer, Klaus wrote:

Thanks a lot Benjamin, but It didn't help.

Kind regards,

Klaus

-----Original Message-----

From: gvsig_internacional-bounces at listserv.gva.es<mailto:gvsig_internacional-bounces at listserv.gva.es> [mailto:gvsig_internacional-bounces at listserv.gva.es] On Behalf Of Benjamin Ducke

Sent: Thursday, July 01, 2010 12:54 AM

To: Users and Developers mailing list

Subject: Re: [Gvsig_english] raster iamge wrong band value

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>

[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<mailto:kmithoefer at icipe.org>

web: www.icipe.org<http://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<mailto:Klaus.mithoefer at cimonline.de>

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Proyecto gvSIG

Consellería de Infraestructuras y Transportes (GVA)

Valencia (Spain)

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Guillermo Tamburini Beliveau

Proyecto gvSIG

Consellería de Infraestructuras y Transportes (GVA)

Valencia (Spain)

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