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

Thu Jan 12 02:44:55 PST 2017

Hi all

upon advice from Andreas, I started a formal description of the
requirements for such a feature:

https://docs.google.com/document/d/1cDemM2m88_mbs65sYzfBbVdHI_ObOjf_i35ne3OKsRs/edit?usp=sharing

Please, anyone interested, do check, comment, add, correct,... Once we have
a "final" version, I will inquire a more precise financial estimation. Then
let's see how we can move forward!

Thanks and cheers

Stéphane

Le jeudi 12 janvier 2017, Stéphane Henriod <stephanebek at gmail.com> a écrit :

> 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
> <javascript:_e(%7B%7D,'cvml','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> 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> 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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>>
>> --
>> 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
>
>

-- 

“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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