[Qgis-user] Raster Layer Symbology Problem

[Martin Bittens]

Sebastian, Bernd,

thanks a lot for your response. I checked the links Sebastian sent. As
far as I could see displaying data in the legend as a continuum is a new
feature in QGIS 3.18 which replaced the previous method displaying data
in the legend as categories (as QGIS 3.16.4 is still doing -
fortunately. Otherwise it would be difficult producing maps in ongoing
projects in a consistent layout). And obviously there is no option
available switching between the old and the new display method.
Personally I think it was not a good decision giving up completely the
categorical display in the legend. In particular if you would work with
multiple colors and a large range of values, there is no way to allocate
map colors to the corresponding values, or vice versa.

So, I hope that the next QGIS version will include an option which
allows selecting the method how to  display the data, as continuum or
categorized.


Regards

Martin


Am 3/9/2021 um 4:18 PM schrieb Sebastian Gutwein:
> Martin,
> I think this may be the result of the new feature
> https://qgis.org/en/site/forusers/visualchangelog318/#feature-gradient-ramp-based-legends
> <https://qgis.org/en/site/forusers/visualchangelog318/#feature-gradient-ramp-based-legends>
> Which is exciting for me becasue that is how I would like to have my
> continious data display. But it sounds like that is not what you are
> interested in. I have not tried 3.18 myself so don't know if there is
> a workaround.
> It does look like there are some links to discussions in the comments
> of this stack exchange question.
> gis.stackexchange.com/questions/388843/qgis-3-18-override-raster-gradient-legends
> <http://gis.stackexchange.com/questions/388843/qgis-3-18-override-raster-gradient-legends>
> gis.stackexchange.com/questions/388154/how-to-get-back-discrete-raster-legend-symbols-in-qgis-3-16
> <http://gis.stackexchange.com/questions/388154/how-to-get-back-discrete-raster-legend-symbols-in-qgis-3-16>
> twitter.com/ThomasG77/status/1365255399927140355
> <http://twitter.com/ThomasG77/status/1365255399927140355>
>
>
> On Tue, Mar 9, 2021 at 7:54 AM Bernd Vogelgesang
> <bernd.vogelgesang at gmx.de <mailto:bernd.vogelgesang at gmx.de>> wrote:
>
>     Without testing I would say it's a bug. Quite some bugs went into 3.18
>     unnoticed and unfortunately, it's not  communicated on the landing
>     page.
>     Next regular point release will be in 10 days, but for urgent
>     stuff, you
>     should better use 3.16.
>
>
>     On 09.03.21 13:32, Martin Bittens wrot:
>     > Hello QGIS User List, i
>     >
>     > I already sent this message but it was not posted, so it is here
>     again.
>     > Hopefully it works now.
>     >
>     >
>     > I am still struggling with the problem creating a legend for a
>     raster
>     > layer. Usually I am working with the following settings in order to
>     > colorize a calculated raster layer (e.g. after applying
>     v.surf.idw on a
>     > point data set):
>     >
>     > - rendering type: singleband pseudocolor
>     >
>     > - interpolation: linear
>     >
>     > - mode: equal interval
>     >
>     >
>     > In QGIS 3.18.0:
>     >
>     > Selecting an appropriate color ramp and applying a
>     classification in,
>     > e.g., 5 classes, I see in the "Layer Properties - Symbology"
>     window the
>     > 5 colored classes separately and the corresponding 5 values (in
>     my case
>     > temperatures) for each color coding. But in the "Layer Panel"
>     the legend
>     > shows the color coding as a continuum and only the first and
>     last value
>     > of the value range appears. The same thing happens in the layout
>     manager
>     > when I create a layout for printing which includes a legend.
>     >
>     > In QGIS 3.16.4 LTR and previous versions:
>     >
>     > Doing the same I get the 5 color classes separately and the
>     > corresponding values for each of the 5 classes in the "Legend
>     Panel"as
>     > well as in the layout manger.
>     >
>     >
>     > My question: Is this a bug in the new QGIS version or does QGIS
>     3.18 not
>     > provide this functionality anymore?
>     >
>     >
>     > Thanks a lot for a comment.
>     >
>     >
>     > Regards
>     >
>     >
>     > Martin
>     >
>     >
>     >
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