[TZGISUG] Raster analysis in QGIS

[Pekka Hurskainen]

Hi,

Yes its not really the right forum - you should repost it to QGIS-User
list. However, I strongly suggest updating to QGIS 2, it handles raster
much better, and the Sextante plugin is now integrated to the core QGIS -
it's now simply called "Processing". If you're under Windows, I recommend
installing it through OSGeo4W installer, in that way it's easy even to
install other necessary software like Saga, Grass, Orfeo Toolbox. Together
all these will make your QGIS much more powerful than alone, and best of
all, you can use all of them straight from QGIS Processing toolbox.

What you refer as stratifying - have you tried the raster calculator ?
There is one in QGIS, but much better ones in Saga and Grass.

Btw. QGIS 2.2 is scheduled to be released today, anxiously waiting for that!

Pekka

On Thu, Feb 20, 2014 at 6:55 PM, Steve Ball <
steve.ball at mpingoconservation.org> wrote:

>  Howdy folks,
>
> Not sure this group is the best forum to ask this question, but I thought
> I'd give it a go. I have a raster of biomass values (derived from RADAR
> data, the values are in floating point format if that matters). I need to
> stratify that into 5t/ha bands, i.e. where the value ranges from 0 to 5,
> then 5 to 10 etc. Displaying the raster visually in these terms is easy
> enough, but actually converting the data into this form appears much
> harder. Then I would like to be able to check the distribution of vector
> point data across those strata (ought to be straightforward), and also to
> compute the total area of each such stratum (not yet sure how I do this).
> It would be nice, not least for future replicability, to accomplish this
> all in QGIS without resorting to ArcView.
>
> Any pointers on relevant instructions on the interwebs most appreciated,
> since am struggling to guess the appropriate search terms. Can the Sextante
> plugin help?
>
> cheers, Steve
>
> ps. Am currently using QGIS 1.8 but could switch to 2.0.1 if that would do
> the trick.
> ________________________________________________
> Steve Ball
> Chief Technical Adviser
> Mpingo Conservation & Development Initiative
> www.mpingoconservation.org
>
>
>
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