[Qgis-user] R: spatial interpolation by a shape file of points

[Carlos Cerdán]

Hi Tonino

I think this is related to how QGIS takes "null" values in this version:
null values are taken as "minus infinite" (-inf), then perhaps it is also
taken as "nan" (not a number).

Try to make your work with GRASS plugin. If you are not familiar with it,
try to convert "nan" values into zero values. Try this expression with
raster calculator:
(DEM<0)*0+(DEM>=0)

This expression converts values less than zero to 0. If you have layers
with different extension, you must be aware about it en raster calc.

Good luck

Carlos Cerdán


2014-08-12 8:34 GMT-05:00 CONTI Tonino <t.conti at comune.jesi.an.it>:

>  Hi Luis Miguel,
> I tried to reduce points and lower the resolution without resolve.
> I thought then that it was a problem with the type of data contained in
> the field that expresses the elevation.
> I then tried to use a number of type double with an accuracy of one
> decimal but I have not solved yet.
>
> Tonino
>
>
>  ------------------------------
> *Da:* Luis Miguel Royo Pérez [luis.miguel.royo at gmail.com]
> *Inviato:* martedì 12 agosto 2014 11.18
> *A:* qgis-user at lists.osgeo.org
> *Oggetto:* Re: [Qgis-user] spatial interpolation by a shape file of points
>
>  Hello,
> maybe I'm wrong, but when I have that message in any software is something
> related with RAM. Maybe the raster file created is very large, try to make
> one with low resolution.
>
> Best wishes.
>
> El 12/08/14 a las #4, CONTI Tonino escribió:
>
> ing a dem from a point file format in shape.
> The raster is not shown but qgis returns the message "bad allocation" and
> the legend shows "nan".
>
>
> --
>
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