[Qgis-developer] Symbolizing a discrete or a boolean raster

[Vincent Schut]

Hi all,

just chiming in to express our need for this improvement as well, and we
would very welcome any improvement in this direction.

Vincent.

On Wed, Jan 11, 2017 at 12:37 PM, Stéphane Henriod <stephanebek at gmail.com>
wrote:

> One last message for today (sorry for spamming!)
>
> It seems that this feature would actually be wished by "many" people (see
> the ticket and the talks on user-). I just gave a try to 2.99-nightly and,
> as far as I can see, nothing has been done in this direction (yet?).
>
> I am wondering if there are massive challenges that I am overlooking or if
> this could be implemented quite easily. In any case, do you think this is a
> request that can be taken on to 3.0?
>
> Thanks a lot to all the devs here... I feel quite bad for asking for a new
> feature while not having the competences to contribute a tiny bit to its
> development but I really feel this is one of the few major missing features
> in QGIS right now (and will be happy to help on the feature requirements,
> the tests, etc.).
>
> All the best!
>
> Stéphane
>
>
> Le mercredi 11 janvier 2017, Stéphane Henriod <stephanebek at gmail.com> a
> écrit :
>
>> Hi again
>>
>> it seems that the requirements are related (although not 100% similar) to
>> this other open (and assigned) ticket: http://hub.qgis.org/issues/14449
>>
>> I really hope to see this very needed feature in a coming version of QGIS
>> and happy to help wherever I can!
>>
>> Cheers
>>
>> Stéphane
>>
>>
>> Le mardi 10 janvier 2017, Stéphane Henriod <stephanebek at gmail.com> a
>> écrit :
>>
>>> Hi
>>>
>>> let me move here a request that has been shortly discussed on the
>>> user-mailing list:
>>> http://lists.osgeo.org/pipermail/qgis-user/2017-January/038793.html
>>> http://lists.osgeo.org/pipermail/qgis-user/2017-January/038795.html
>>> http://lists.osgeo.org/pipermail/qgis-user/2017-January/038801.html
>>>
>>> and for which a ticket is open:
>>> http://hub.qgis.org/issues/14845
>>>
>>> I was said that some work has been done in this direction for 3.0 but I
>>> don't know if it completely covers the feature request
>>>
>>> ----------------------
>>>
>>> When styling a discrete or boolean raster, there seems to be no direct
>>> method, only a few workarounds. The feature I dream of would do the
>>> following:
>>>
>>>    - A new render type "Discrete raster"
>>>    - One button allows to fetch all unique values form the raster (with
>>>    a warning message if there are more than XXX unique values)
>>>    - A color ramp is applied by default
>>>    - I can multi-select values and apply them the same style and / or
>>>    the same label
>>>    - I can remove values. The pixels with those values will simply not
>>>    be displayed
>>>    - I can save my color map and load an existing color map
>>>
>>> So pretty much like the ArcGIS implementation:
>>> http://resources.arcgis.com/en/help/main/10.1/index.html#/re
>>> presenting_unique_categories_such_as_land_use/009t00000074000000/
>>>
>>> The current limitations I see (in 2.14):
>>>
>>>    - The discrete values must be entered manually, which is a pain for
>>>    a raster with many unique values (or if I don't know in advance what all
>>>    values are)
>>>    - If I click on *Classify*, QGIS will choose X values (based on the
>>>    number of classes and the classification method (continuous or equal
>>>    interval)), which no longer match the "exact" values of my raster. It
>>>    doesn't really make sense to classify a discrete rendering
>>>    - Although it is currently possible to style discrete rasters, the
>>>    procedure is not really intuitive for beginners
>>>
>>> ----------------------
>>>
>>> Is this a feature that is envisioned for 3.0? Is there anything I can do
>>> to support it? (except coding it myself, since I don't have the skills for
>>> that...)
>>>
>>> Thanks a lot in advance
>>>
>>> Cheers
>>>
>>> Stéphane
>>>
>>>
>>
>> --
>>
>> “When you travel, remember that a foreign country is not designed to make
>> you comfortable. It is designed to make its own people comfortable." --
>> Clifton Fadiman
>>
>>
>
> --
>
> “When you travel, remember that a foreign country is not designed to make
> you comfortable. It is designed to make its own people comfortable." --
> Clifton Fadiman
>
>
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