[Gvsig_english] raster iamge wrong band value
Francisco José Peñarrubia
fpenarru at gmail.com
Wed Jul 7 08:55:38 CEST 2010
Hi Klaus.
I think the problem is about byte datatype in java. In C++ you can use
an unsigned byte, but in java you can't (always are signed).
So, for this kind of images, we should use internaly int's instead of
byte's. So, yes, it seems a bug, and can be corrected in future releases.
Thanks for your help.
Fran.
Mithoefer, Klaus escribió:
>
> 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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>
>
>
>
> -- Guillermo Tamburini Beliveau
>
> 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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--
Fran Peñarrubia
Scolab
www.scolab.es
Asociación gvSIG
www.gvsig.com
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