[Qgis-developer] Kriging interpolation functionality in QGIS?

[Stefan Keller]

Werner, Barry

I just wrote to have Kriging in QGIS with less external *dependencies*
like GRASS, SAGA (or R).
That's what I meant by "easier to use" in my initial thread.

Then I challenged the benefit of Kriging versus IDW just because I
don't want to use it because it's cool.
Thanks to Barry and others for the explanations.

The use case you obviously have in mind, is to do data analytics as a
researcher or informed user - which requires the steps Sjur mentioned
(many thanks too).

On the other hand, to me it's still worth thinking of a helper dialog
(in whatever implementation and whatever you call it) which suggests
parameters calculated on cross validation.

... Unless you are saying that only statisticians can ever master Kriging :-O

:Stefan



2015-09-28 17:34 GMT+02:00 Werner Macho <werner.macho at gmail.com>:
> Well written and I fully support that.
> Sometimes it seems that people want a wizard for everything (and a
> computer that can read their mind).
> I am against imitating everything that "commercial software" provides.
> Sometimes it is better to treat users to switch on their brain.
> For me that is still the point that separates Opensource Software from
> proprietary one.
> I am not sure if we should try to get more users at all cost. Let's do
> things correct - even if that is not always popular (because it is not
> in reach with one click).
>
> just my 2c
> Werner
>
> On Mon, Sep 28, 2015 at 1:37 PM, Barry Rowlingson
> <b.rowlingson at lancaster.ac.uk> wrote:
>> On Mon, Sep 28, 2015 at 10:35 AM, Victor Olaya <volayaf at gmail.com> wrote:
>>
>>> From the point of view of user-friendliness, the Processing
>>> implementation (wrapping the corresponding SAGA modules), might not be
>>> as easy to use as some people would like, but for tools such as
>>> kriging I am strongly against wizard-like UI's and similar elements.
>>> ArcGIS's Statistical Analyst is great and has a wizard with a
>>> fantastic "next" button that allows you to interpolate using all sort
>>> of esoteric methods and will make you believe that you are creating
>>> sound raster layers...when the truth is that, without knowledge, you
>>> are creating rubish. I don't like to give users that wrong sensation.
>>
>> Agreed. Anything claiming to be a "wizard" for Kriging really needs to
>> be a psychic wizard that can read your thoughts and understand your
>> data. A better device would be an "Interrogator":
>>
>> *ping* Your data seems to be discrete small integers, are you sure you
>> want to model it as a Gaussian? [*yes*/no]
>>
>> *ping* So you want to model your data with Gaussian cofactor response
>> p-value thresholds from an underlying Bayesian surface? [*yes*/no]
>>
>> *ping* That last question was nonsense. You're just clicking "yes"
>> until you get a surface model - any surface model - right? [*yes*/no]
>>
>> *ping* okay, at least you are honest. I'm deleting the kriging module
>> now, go find a statistician.
>>
>> Barry
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