[Qgis-user] Null values in PostGIS

[samuelmesa at gmail.com]

Thanks for your answer Alex.

regards,

Samuel Mesa


2014-04-02 22:31 GMT-05:00 Alex Mandel <tech_dev at wildintellect.com>:

> On 04/02/2014 08:19 PM, samuelmesa at gmail.com wrote:
> > Hello. I have a layer of meteorological stations with temporal
> information
> > in PostGIS. Some of the stations have variables with null values. In
> QGIS v2.3
> > (Ubuntu 13.10), null values are displayed correctly in the attribute
> table.
> > However, when displaying the label is treated as a value of 0, similarly
> when
> > I perform an operation interpolation (IDW algorithm from the raster
> menu),
> > where this result should ignore null values stations.
> >
> > My question is, is this a bug in QGIS?.
> >
> > Attached a screenshot trying to explain the results of interpolation and
> > labeled, possibly wrong with null values.
> >
> > https://drive.google.com/file/d/0B9J3L0xnIeLZLWRtSkJLeXp1RzA
> >
> > regards,
> >
> > Samuel Mesa,
> >
>
> Might be a bug, I would suggest creating a Postgis View that filters out
> the nulls and work with that.
>
> Thanks,
> Alex
>
>


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