[Qgis-developer] GRASS requirements changed

Giovanni Manghi giovanni.manghi at gmail.com
Tue Mar 16 09:39:08 EDT 2010


On Mon, 2010-03-15 at 21:10 +0100, Radim Blazek wrote:
> 1) GDAL-GRASS driver is no more required, GRASS rasters are accessed
> directly using GRASS libs not via GDAL...

The new GRASS provider solved  many problems, especially a few nasty
bugs that made many GRASS modules not usable under Vista and Seven
(caused qgis to crash). See for example #1945 and #2028.

Moreover it "solved" a QGIS critical bug that was not yet spotted:
basically after closing a mapset (and leaving a GRASS raster in the
legend), clicking on the canvas with a tool such the identify tool, made
qgis crash. You can spot this bug in QGIS 1.4.

Nevertheless there are a few consequences in the QGIS "raster layer
properties" that would need a fix, at least in the interface.

In short, the symbology, transparency and colormap menus now make a
little sense for GRASS rasters as the options in there are not working
except for the "global transparency" slider.

It would be useful to have back, if possible, the "transparent pixel
list" and the colormap table.

In any case the qgis "raster layer properties" should be reorganized
(simplified?) for GRASS rasters because as is now in trunk is puzzling
for users.

I would like also to point that with the new GRASS raster provider an
important plugin stopped to work (with GRASS rasters): "value tool".

this plugin is kind of fundamental when doing raster analysis/models,
and considered the number of tools available in the GRASS toolbox it is
highly probable you are doing it with GRASS rasters.

Using the identify tool to see raster values in a certain point is not
really an option.

I would be really happy if this issues will be approached in the next
dev meeting.

thanks in advance

-- Giovanni --

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