[mapserver-users] WFS changing NULL values to 0.

[Marcin Grudzień]

Dear Jukka,

We have migrated data to the PostGIS database and now everything works fine.
Thank you for your support.

Best regards,
Marcin

On Mon, 2 Aug 2021 at 17:16, Rahkonen Jukka (MML) <
jukka.rahkonen at maanmittauslaitos.fi> wrote:

> Hi,
>
>
>
> Attributes of type double can not really be nulls in shapefile. See
> https://desktop.arcgis.com/en/arcmap/latest/manage-data/shapefiles/geoprocessing-considerations-for-shapefile-output.htm#GUID-A10ADA3B-0988-4AB1-9EBA-AD704F77B4A2.
> A value -1.7976931348623158e+308 might work as a null but I do not
> consider it generally reliable. Use some other format as a datasource.
>
>
>
> -Jukka Rahkonen-
>
>
>
> *Lähettäjä:* mapserver-users <mapserver-users-bounces at lists.osgeo.org> *Puolesta
> *Marcin Grudzien
> *Lähetetty:* maanantai 2. elokuuta 2021 15.07
> *Vastaanottaja:* mapserver-users at lists.osgeo.org
> *Aihe:* [mapserver-users] WFS changing NULL values to 0.
>
>
>
> Hi,
>
>
>
> I am publishing an SHP file via the WFS service using Mapserver 7.2.2
>
>
>
> In some cases, attributes of a type double have NULL values in the SHP. In
> such cases, MapServer is publishing them as "0" in GetFeature responses
> which may be confusing to the data users. I would like to achieve a
> situation that if the attribute value is NULLin SHP, the attribute is not
> published in GetFeature response.
>
>
>
> For example the response instead of this
>
> <wfs:member>
> <ms:Bazowa_pozioma>
> <ms:msGeometry>
> <gml:Point gml:id=".1" srsName="urn:ogc:def:crs:EPSG::2180">
> <gml:pos>419591.224000 697399.714000</gml:pos>
> </gml:Point>
> </ms:msGeometry>
> <ms:NR_PUNKTU>284301500</ms:NR_PUNKTU>
> <ms:X1992>419591.224</ms:X1992>
> <ms:Y1992>697399.714</ms:Y1992>
> <ms:H_PLKRON86>0</ms:H_PLKRON86>
> <ms:MH_PLKRON8>0</ms:MH_PLKRON8>
> </ms:Bazowa_pozioma>
> </wfs:member>
>
>
>
> Should look like this
>
> <wfs:member>
> <ms:Bazowa_pozioma>
> <ms:msGeometry>
> <gml:Point gml:id=".1" srsName="urn:ogc:def:crs:EPSG::2180">
> <gml:pos>419591.224000 697399.714000</gml:pos>
> </gml:Point>
> </ms:msGeometry>
> <ms:NR_PUNKTU>284301500</ms:NR_PUNKTU>
> <ms:X1992>419591.224</ms:X1992>
> <ms:Y1992>697399.714</ms:Y1992>
> </ms:Bazowa_pozioma>
> </wfs:member>
>
>
>
> Can it be achieved in MapServer?
>
>
>
> Best regards,
>
> Marcin
>
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