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

Wed Jan 11 20:05:43 PST 2017

Hi Alexandre

(also posting on user-)

I 100% agree with you and I would love to somehow give back to QGIS (I did
already, but at a small scale).

I mostly wanted to know if I am the only one to wish for this feature.
Apparently not the case: many have expressed the same wish!

Now funding: I would love to have a rough idea what "not very expensive"
means. If there are any dev around who could have the interest / skills to
implement this feature, can we somehow go concrete and work together on a
feature description and tentative budget? The situation is obviously very
different if we talk about 1.000 or 20.000€

Cheers

Stéphane

Le jeudi 12 janvier 2017, Alexandre Neto <senhor.neto at gmail.com> a écrit :

> Hello Stéphane,
>
> IMHO, since it seems that you are not able/willing to sponsor the feature
> yourself, sounds like a good opportunity for a small crowdfunding.
>
> That way you would be able to contribute back to QGIS by giving your time
> in finding a developer able to do it, setting up the crowdfunding,
> advertise it, pay for part of it and so on.
>
> It looks like a simple feature. it should not be very expensive (much less
> than an ArcGIS license for sure), and if you think many people need this,
> then the money will be easy to raise.
>
> Alexandre Neto
>
> Stéphane Henriod <stephanebek at gmail.com
> <javascript:_e(%7B%7D,'cvml','stephanebek at gmail.com');>> escreveu no dia
> quarta, 11/01/2017 às 11:37:
>
>> 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
>> <javascript:_e(%7B%7D,'cvml','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#/
>>>> representing_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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>
> --
> Alexandre Neto
> ---------------------
> @AlexNetoGeo
> http://sigsemgrilhetas.wordpress.com
> http://gisunchained.wordpress.com
>

-- 

“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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