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Can you supply a small subset of your data? The procedure should not
be difficult, and I'd be willing to try some methods and show how
it's done.<br>
<br>
<br>
<div class="moz-cite-prefix">On 2017-07-06 12:03 PM, Laurence Béchet
wrote:<br>
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Thanks Micha. Well, now I'm getting completely confused. And that
tool under raster is probably not what I'm looking for.<br>
<br>
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. <br>
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 ...<br>
<br>
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 ...<br>
I'm on windows8 pro 64bits with qgis 2.18.10 ...<br>
Laurence<br>
<br>
<div class="moz-cite-prefix">On 6/07/2017 5:28 p.m., Micha Silver
wrote:<br>
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<div class="moz-cite-prefix">On 2017-07-06 00:48 AM, Laurence
Béchet wrote:<br>
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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.<br>
<br>
So I tried to use the gdal_grid function and ... I got an
error message:<br>
ERROR 1: Attempt to create ADRG dataset with an illegal data
type (Float64), only Byte supported by the format. <br>
<br>
</blockquote>
Did you want your output in ADRG?? If not, then when you choose
the output file, change the type to Geotiff.<br>
<br>
<blockquote type="cite"
cite="mid:5a54bee8-381a-c247-a940-a371d24a0648@gmail.com"> I
looked on internet, but didn't find anything useful.<br>
So I'm back to square1 .... and cannot produce the map I need
...<br>
<br>
Cheers<br>
Laurence<br>
<br>
<div class="moz-cite-prefix">On 5/07/2017 6:43 p.m., Micha
Silver wrote:<br>
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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, <b>Raster->Analysis->Grid
(interpolation)</b>. This uses the gdal_grid utility<br>
<br>
<div class="moz-cite-prefix">On 07/05/2017 06:35 AM,
Laurence Béchet wrote:<br>
</div>
<blockquote type="cite"
cite="mid:5a2bf286-1a0a-ca3f-4cd1-f198012e53fd@gmail.com">Hi
<br>
<br>
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). <br>
<br>
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. <br>
Is this normal? What is then the workaround for the IDW
interpolation? <br>
<br>
Also the path to grass7 in the config file is wrong
(processing / options), which makes it crash ... Is this
also normal? <br>
<br>
Thanks for the help in advance! <br>
Laurence Bechet <br>
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<br>
<pre class="moz-signature" cols="72">--
Micha Silver
cell: +972-523-665918</pre>
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