[Qgis-user] SAGA missing from the processing toolbox?

[Laurence Béchet]

Thanks Micha. Well, now I'm getting completely confused. And that tool 
under raster is probably not what I'm looking for.

I have a shapefile of points. One of the fields is the record of 
poisoned bait eaten by the pests we are controlling. While it is easy to 
represent all the features categorised by the amount of eaten bait, I'd 
like to generate a continuous picture or the pest controlled area by 
interpolating the values between the recorded places. The idea is 
debatable on a theoretical point of view (why the bait uptake would be 
continuous?), but the final raster map is easier to visualise and a good 
advocate of the field work done.
Thus the need of the IWD interpolation. We started doing it many years 
ago with ArcGIS and it was very easy to do it. As a fervent advocate of 
qGIS, I'm trying to do the same but with a lot of struggles and failures 
at the moment ...

If anyone has tried to do the same thing or has any ideas how to do it 
with qGIS, it would be very welcome ;o) Please keep in mind we are not 
IT people ...
I'm on windows8 pro 64bits with qgis 2.18.10 ...
Laurence

On 6/07/2017 5:28 p.m., Micha Silver wrote:
>
>
> On 2017-07-06 00:48 AM, Laurence Béchet wrote:
>> Thanks Micha for the tip. The function didn't look that way a few 
>> years ago and that's why I had given up using the default raster 
>> analysis tool.
>>
>> So I tried to use the gdal_grid function and ... I got an error message:
>> ERROR 1: Attempt to create ADRG dataset with an illegal data type 
>> (Float64), only Byte supported by the format.
>>
> Did you want your output in ADRG?? If not, then when you choose the 
> output file, change the type to Geotiff.
>
>> I looked on internet, but didn't find anything useful.
>> So I'm back to square1 .... and cannot produce the map I need ...
>>
>> Cheers
>> Laurence
>>
>> On 5/07/2017 6:43 p.m., Micha Silver wrote:
>>> I don't know why you're having trouble with the processing toolbox, 
>>> but regarding IDW interpolation, you can do it straight in the 
>>> Raster menu, *Raster->Analysis->Grid (interpolation)*. This uses the 
>>> gdal_grid utility
>>>
>>> On 07/05/2017 06:35 AM, Laurence Béchet wrote:
>>>> Hi
>>>>
>>>> I need to use the Inverse Distance Weighted Interpolation from SAGA 
>>>> within qGIS, which I did with a previous version of qGIs but this 
>>>> time it didn't work because of a missing library (qGIS 2.18.9 - 
>>>> windows8 pro, 64bits).
>>>>
>>>> I updated the qGIS version with the latest 2.18.10 (windows8 pro, 
>>>> 64 bits), but this time the SAGA tools are not displayed at all in 
>>>> the list, despite they are ticked in the config file.
>>>> Is this normal? What is then the workaround for the IDW interpolation?
>>>>
>>>> Also the path to grass7 in the config file is wrong (processing / 
>>>> options), which makes it crash ... Is this also normal?
>>>>
>>>> Thanks for the help in advance!
>>>> Laurence Bechet
>>>> _______________________________________________
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>>>
>>> -- 
>>> Micha Silver
>>> cell: +972-523-665918
>>
>

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