[Gvsig_english] Raster pyramids and INTEROPERABILITY

[ernesto sferlazza]

Hello developers,
in the county government organization where I work we currently work
both with commercial (ESRI ArcGIS Desktop) and Open Source (gvSIG,
adbToolbox, the latter being a customization of OpenJump) GIS
software.
All raster layers in the geographic archive are stored together with
the pyramids, built by arcGIS, to optimize display rendering and
zooming with this software.
The problem is that when the a raster layer is loaded into a gvSIG
view,  the existence of pyramids causes problems in visualization
(e.g. for a B/W - 1 bit - image, zooming to the whole raster extent it
appears displayed all black, while zooming in, at a certain extent,
the image is displayed correctly).
The trick is to brutally delete the pyramid file  (*.rrd) associated
to the raster, but when we load tagain the raster on a ArcGIS View
Frame the image is displayed with a coarse resolution (compared with
the high quality resolution and zoom speed obtained with pyramids).
I suggest two alternative solution:
a) force gvSIG to ignore pyramids;
b) syncronize the behaviour of gvSIG with that of ArcGis regarding the
pyramids rendering.
Best regards

-- 
ing. Ernesto Sferlazza
responsabile nodo provinciale di Agrigento del SITR Sicilia
resp. gruppo Sistema Informativo Territoriale
Provincia regionale di Agrigento
sede istituzionale: piazza Aldo Moro, 1 - 92100 AGRIGENTO
sede operativa: via Acrone, 27 - 92100 AGRIGENTO
cell. 3392718463 (personale)
       3316874296 (aziendale)
tel. uff 0922593752