[Gvsig_english] Raster support on GVSIG

[Simon Cropper (Botanicus Australia Pty Ltd)]

Edson,

The latest version of gvSIG is 1.9. Spanish manuals are available at 
http://www.gvsig.org and English versions are being prepared.

The manual for the earlier version, version 1.1.2, is available at 
http://www.gvsig.org/web/docusr/manuales-en and discusses the basic 
concepts.

gvSIG can display and manipulate jpeg, jpg, gif, png, bmp and svg (+ 
more). Although some require header files containing georeferencing data 
to be displayed correctly.

gvSIG can also connect to GeoDB, WCS, ArcIMS, WMS, Annotation and WFS 
internet services that can contain image data.

Usually JPG or PNG files require header files that contain the 
coordinates of the upper left corner and the pixel size. A typical 
example can be seen below.

For a file called "JPG_Image.jpg" you would have a corresponding file 
called "JPG_Image.jpgw". gvSIG also creates an "aux.xml" and "rmf" file 
with the same data.

The content of the different files look like this...

*JPGW*

0.3376811594201211
0.0
0.0
-0.33768115942109755
341082.7
5814636.992753624


*AUX.XML*

<PAMDataset>
<GeoTransform> 3.4108270000000001e+005, 3.3768115942012111e-001, 
0.0000000000000000e+000, 5.8146369927536240e+006, 
0.0000000000000000e+000,-3.3768115942109755e-001</GeoTransform>
<Metadata domain="IMAGE_STRUCTURE">
<MDI key="INTERLEAVE">PIXEL</MDI>
<MDI key="COMPRESSION">JPEG</MDI>
</Metadata>
<PAMRasterBand band="1">
<Metadata domain="IMAGE_STRUCTURE">
<MDI key="COMPRESSION">JPEG</MDI>
</Metadata>
</PAMRasterBand>
<PAMRasterBand band="2">
<Metadata domain="IMAGE_STRUCTURE">
<MDI key="COMPRESSION">JPEG</MDI>
</Metadata>
</PAMRasterBand>
<PAMRasterBand band="3">
<Metadata domain="IMAGE_STRUCTURE">
<MDI key="COMPRESSION">JPEG</MDI>
</Metadata>
</PAMRasterBand>
</PAMDataset>

*RMF*

<?xml version="1.0" encoding="ISO-8859-15"?>
<RasterMetaFile>
<FLyrGeoRaster>
<Extent>
<X>341082.7</X>
<Y>5814636.992753624</Y>
<RotationX>0.0</RotationX>
<RotationY>0.0</RotationY>
<PixelSizeX>0.3376811594201211</PixelSizeX>
<PixelSizeY>-0.33768115942109755</PixelSizeY>
<Width>0.0</Width>
<Height>0.0</Height>
</Extent>
<Dimension>
<ImagePxWidth>138.0</ImagePxWidth>
<ImagePxHeight>127.0</ImagePxHeight>
</Dimension>
</FLyrGeoRaster>
</RasterMetaFile>



Cheers Simon

Simon Cropper
Botanicus Australia Pty Ltd
PO Box 160, Sunshine, Victoria 3020.
P: 9311 5822. M: 041 830 3437.
mailto: scropper at botanicusaustralia.com.au 
<mailto:scropper at botanicusaustralia.com.au>
web: www.botanicusaustralia.com.au <http://www.botanicusaustralia.com.au>


On 10/02/2010 11:22 PM, Edson Campos da Cunha wrote:
>
> Hi volks,
>
> I have just started working with GVSIG on the last few days.
>
> I need to display georeferenced images on GVSIG. Is there any 
> reference documentation about that, preferable with some examples?
>
> A coworker on my job tested successfully image displaying in GVSIG 
> with ECW files. The problem is that I must generate the images with 
> GeoMedia WebMap and it does not support ECW exporting. It exports to 
> CGM, JPG, PNG and SVG. My doubt precisely is: what kinds of additional 
> files must I use so that GVSIG can display images such as PNG or JPG 
> in the correct position on the map?
>
> Any help will be appreciated
>
> Best regards,
>
> *EDSON CUNHA
> *Analista de Sistemas
>
> *Coffey Information
> *Av Afonso Pena 3924 conj 206 - Bairro Cruzeiro
> Belo Horizonte - MG - Brasil - CEP 30.130-009
> T +55 31 2104 2196 F +55 31 2104 2105
> coffey.com <http://coffey.com/>
>
>
> _______________________________________________
> Gvsig_internacional mailing list
> Gvsig_internacional at listserv.gva.es
> http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional
>