[Qgis-user] Interpolation analyses

[Nicolas Cadieux]

I removed your image as the user group was blocking it.

On 2022-06-09 3:29 p.m., Nicolas Cadieux wrote:
>
> I Forgot to add the user list...
>
> On 2022-06-09 3:27 p.m., Nicolas Cadieux wrote:
>>
>> Hi,
>>
>> Notice the selection box besides "Précision".  You will see "Estimée 
>> (plus rapide)", Change that to "Actual (slower)". Then, if you choose 
>> min/max, you should see the correct values.  If you don't see the 
>> correct min-max value, open processing/Raster information/ select 
>> "Force computation of the actual min/max values for each band".  add 
>> -stats in the additional command-line parameters.
>>
>> Bonne Chance
>>
>> Nicolas Cadieux
>>
>>
>> On 2022-06-09 11:46 a.m., Thibaut Bouveroux wrote:
>>> Hi Nicolas,
>>>
>>> Thanks a lot for your help. I am using the QGIS idk interpolation. I 
>>> think I figured out a way to get the results fitting my data 
>>> adjusting min and max values from the dataset. When I get the 
>>> output, I can change the min and max values in the symbology tab. Is 
>>> that the way you would recommend?
>>>
>>> Thanks a lot for your assistance.
>>>
>>> Best,
>>>
>>>
>>>
>>>
>>>> Le 9 juin 2022 à 10:32 AM, Nicolas Cadieux 
>>>> <njacadieux.gitlab at gmail.com> a écrit :
>>>>
>>>> Hi,
>>>>
>>>> It would help if you gave what algorithms you are using.  There is 
>>>> a Gdal and a QGIS idw interpolation method and they are not working 
>>>> the same way.  Also, QGIS has a quick way of determining the min 
>>>> max value that are an estimate of the true values.  Use Gdal info 
>>>> with flag -stats to get the true values.  You will find that in the 
>>>> processing plugin.
>>>>
>>>> https://gdal.org/programs/gdalinfo.html
>>>>
>>>> Nicolas Cadieux
>>>> https://gitlab.com/njacadieux
>>>>
>>>>> Le 9 juin 2022 à 10:33, Thibaut Bouveroux via Qgis-user 
>>>>> <qgis-user at lists.osgeo.org> a écrit :
>>>>>
>>>>> Hi everyone,
>>>>>
>>>>> I am trying to make an IDW interpolation analyses using salinity 
>>>>> data in a bay. My values ranges between 0.1 to 13.1 PSU. When 
>>>>> making my interpolation with 148 data points, the interpolation 
>>>>> output ranges between 0.0034 to 12.40 and so doesn't fit 100% with 
>>>>> the dataset. Can someone has na idea why? Using the same data set 
>>>>> in ArcMap, the interpolation I made ranged between 0.1 and 13.1 
>>>>> and does fit 100% with my dataset.
>>>>>
>>>>> Thanks a lot for your assistance,
>>>>>
>>>>> Best,
>>>>>
>>>>> Thibaut
>>>>>
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>>>
>> -- 
>> Nicolas Cadieux
>> https://gitlab.com/njacadieux
> -- 
> Nicolas Cadieux
> https://gitlab.com/njacadieux

-- 
Nicolas Cadieux
https://gitlab.com/njacadieux
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