Hi Kurt

happy to see that I'm not the only one to struggle here!

I linked your request to mine here: http://hub.qgis.org/issues/14845

Are you on the dev list as well? If yes, you can link up to my last
message. The more we are to express this need, the higher the likelihood
that it can get implemented at some point :-)

I don't really work with raster attribute tables but I guess what you
described below could fit in the same implementation. Click on "retrieve
all unique values" can retrieve either from the attribute table or from the
actual  pixel values of a geoTiff.



Le mardi 10 janvier 2017, Kurt Menke <k...@birdseyeviewgis.com> a écrit :

> Hi Stéphane,
> I too feel this is a major missing piece of functionality in QGIS. I often
> work with large vegetation and landcover rasters, and while it is possible
> to work with them in QGIS, it seems much more laborious than it needs to
> be. I entered a related ticket on this issue last year
> https://hub.qgis.org/issues/14449
> My take was slightly different, I was suggesting that there be support for
> raster attribute tables that come with many of these datasets, especially
> when they are in ERDAS Imagine img files. These attribute tables often
> include important data like vegetation type, vegetation complex, etc. If
> the table could be accessed you would then open the dataset up for both
> attribute queries and styling.  These attribute columns could be made
> available to style the raster via the Categorized or Rule based renderers.
> For example, a vegetation dataset could be brought in and styled by the
> vegetation type attribute column. Or groups of vegetation/landcover types
> could be assigned the same color with the Rule based renderer.
> However, your solution may be easier to implement. It would be a major
> improvement to the software…in my humble opinion J
> Cheers,
> Kurt
> **************************
> Kurt Menke, GISP
> Bird’s Eye View
> www.BirdsEyeViewGIS.com <http://www.birdseyeviewgis.com/>
> Work: 505-265-0243
> Cell: 505-362-1776

Stéphane Henriod
CIM-Expert for GIS and Green Economy Statistics

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