[Qgis-developer] Kriging interpolation functionality in QGIS?

[Victor Olaya]

Stefan

Leaving aside the statistical discussion, the Processing
implementation doesn't use really aný "external" element. It uses
SAGA, that's true, but if you use a QGIS package (in Win or Mac), SAGA
is installed and configured automatically, and it is used as any of
the dozens of libraries that QGIS uses underneath ...so the user wont
notice that is using an external software, just like you don't notice
that you use GDAL for opening layers.

Using R is a differenet thing, that requires manual configuration...

Cheers



2015-09-28 20:32 GMT+02:00 Stefan Keller <sfkeller at gmail.com>:
> 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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