Re: [Geoserver-users] WPS plugin issue/usage

[Andrea Aime]

Hi David,
the JTS:centroid takes a single geometry and computes its centroid.
In both cases instead you're feeding it a feature collection, that list, a
list of features, where each feature is geometry + attributes.

So, you're giving it something much more complex than what it's prepared to
process.
Something like this would work instead:

http://www.w3.org/2001/XMLSchema-instance;
xmlns="http://www.opengis.net/wps/1.0.0;
xmlns:wfs="http://www.opengis.net/wfs;
xmlns:wps="http://www.opengis.net/wps/1.0.0;
xmlns:ows="http://www.opengis.net/ows/1.1;
xmlns:gml="http://www.opengis.net/gml;
xmlns:ogc="http://www.opengis.net/ogc;
xmlns:wcs="http://www.opengis.net/wcs/1.1.1;
xmlns:xlink="http://www.w3.org/1999/xlink;
xsi:schemaLocation="http://www.opengis.net/wps/1.0.0
http://schemas.opengis.net/wps/1.0.0/wpsAll.xsd;>
  JTS:centroid
  

  geom
  

  

  

  
  

  result

  


I'm giving the process what it's expecting: a polygon (would work with any
other geometry type as well, as long as they are just geometries).

Regards,

Andrea Aime


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On Thu, Apr 4, 2024 at 1:05 PM David Alvey (Corporate Services and
Transformation) via Geoserver-users 
wrote:

> Hi
>
> I have installed the WPS extension in geoserver 2.21.1 but not sure if my
> query is wrong or the installation has failed.
>
> The heatmap tiles do render but when running a centroid query by Posting
> the following to https://wms.derbyshire.gov.uk/geoserver/ows?strict=true
>
>
>  service="WPS" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance;
> xmlns="http://www.opengis.net/wps/1.0.0; xmlns:wfs="
> http://www.opengis.net/wfs; xmlns:wps="http://www.opengis.net/wps/1.0.0;
> xmlns:ows="http://www.opengis.net/ows/1.1; xmlns:gml="
> http://www.opengis.net/gml; xmlns:ogc="http://www.opengis.net/ogc;
> xmlns:wcs="http://www.opengis.net/wcs/1.1.1; xmlns:xlink="
> http://www.w3.org/1999/xlink; xsi:schemaLocation="
> http://www.opengis.net/wps/1.0.0
> http://schemas.opengis.net/wps/1.0.0/wpsAll.xsd;>
>   JTS:centroid
>   
> 
>   geom
>   https://wms.derbyshire.gov.uk/geoserver/DCC/ows?service=WFSversion=1.0.0request=GetFeaturetypeName=DCC%3AMotorbike_Accidents_2022maxFeatures=50outputFormat=application%2FjsonpropertyName=the_geom;
> method="GET"/>
> 
>   
>   
> 
>   result
> 
>   
> 
>
> I get
>
> 
> http://www.w3.org/2001/XMLSchema;
> xmlns:ows="http://www.opengis.net/ows/1.1; xmlns:wps="
> http://www.opengis.net/wps/1.0.0; xmlns:xlink="
> http://www.w3.org/1999/xlink; xml:lang="en" service="WPS"
> serviceInstance="http://wms.derbyshire.gov.uk/geoserver/ows?;
> version="1.0.0">
> 
> JTS:centroid
> Centroid
> Returns the geometric centroid of a geometry. Output
> is a single point.  The centroid point may be located outside the
> geometry.
> 
> 
> 
> 
>  locator="geom">
> Failed to retrieve value for input
> geom
> 
> 
> 
> 
> 
>
> The actual name of the geometry column is the_geom but tried changing the
> identifier and get (this does get logged)
>
> 
> http://www.w3.org/2001/XMLSchema;
> xmlns:ows="http://www.opengis.net/ows/1.1; xmlns:xsi="
> http://www.w3.org/2001/XMLSchema-instance; version="1.1.0"
> xsi:schemaLocation="http://www.opengis.net/ows/1.1
> http://wms.derbyshire.gov.uk/geoserver/schemas/ows/1.1.0/owsAll.xsd;>
> 
> No such parameter: the_geom
> 
> 
>
> The xml was generated using the "Demos" tab in the geoserver instance.
> Unfortunately due to our server setup I can only test via 

[Geoserver-users] WPS plugin issue/usage

[David Alvey (Corporate Services and Transformation) via Geoserver-users]

Hi

I have installed the WPS extension in geoserver 2.21.1 but not sure if my query 
is wrong or the installation has failed.

The heatmap tiles do render but when running a centroid query by Posting the 
following to https://wms.derbyshire.gov.uk/geoserver/ows?strict=true


http://www.w3.org/2001/XMLSchema-instance; 
xmlns="http://www.opengis.net/wps/1.0.0; xmlns:wfs="http://www.opengis.net/wfs; 
xmlns:wps="http://www.opengis.net/wps/1.0.0; 
xmlns:ows="http://www.opengis.net/ows/1.1; 
xmlns:gml="http://www.opengis.net/gml; xmlns:ogc="http://www.opengis.net/ogc; 
xmlns:wcs="http://www.opengis.net/wcs/1.1.1; 
xmlns:xlink="http://www.w3.org/1999/xlink; 
xsi:schemaLocation="http://www.opengis.net/wps/1.0.0 
http://schemas.opengis.net/wps/1.0.0/wpsAll.xsd;>
  JTS:centroid
  

  geom
  https://wms.derbyshire.gov.uk/geoserver/DCC/ows?service=WFSversion=1.0.0request=GetFeaturetypeName=DCC%3AMotorbike_Accidents_2022maxFeatures=50outputFormat=application%2FjsonpropertyName=the_geom;
 method="GET"/>

  
  

  result

  


I get


http://www.w3.org/2001/XMLSchema; 
xmlns:ows="http://www.opengis.net/ows/1.1; 
xmlns:wps="http://www.opengis.net/wps/1.0.0; 
xmlns:xlink="http://www.w3.org/1999/xlink; xml:lang="en" service="WPS" 
serviceInstance="http://wms.derbyshire.gov.uk/geoserver/ows?; version="1.0.0">

JTS:centroid
Centroid
Returns the geometric centroid of a geometry. Output is a 
single point.  The centroid point may be located outside the 
geometry.





Failed to retrieve value for input 
geom






The actual name of the geometry column is the_geom but tried changing the 
identifier and get (this does get logged)


http://www.w3.org/2001/XMLSchema; 
xmlns:ows="http://www.opengis.net/ows/1.1; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance; version="1.1.0" 
xsi:schemaLocation="http://www.opengis.net/ows/1.1 
http://wms.derbyshire.gov.uk/geoserver/schemas/ows/1.1.0/owsAll.xsd;>

No such parameter: the_geom



The xml was generated using the "Demos" tab in the geoserver instance. 
Unfortunately due to our server setup I can only test via Postman.

I have tried lots of permutations but can only assume that my query is wrong, 
dataset has issues, plugin has issues or our network is causing me grief. I 
have also tried passing in json

The layers I have used are live and public.

This is not what I want to achieve but I also tried feeding a point in
http://www.w3.org/2001/XMLSchema-instance; 
xmlns="http://www.opengis.net/wps/1.0.0; xmlns:wfs="http://www.opengis.net/wfs; 
xmlns:wps="http://www.opengis.net/wps/1.0.0; 
xmlns:ows="http://www.opengis.net/ows/1.1; 
xmlns:gml="http://www.opengis.net/gml; xmlns:ogc="http://www.opengis.net/ogc; 
xmlns:wcs="http://www.opengis.net/wcs/1.1.1; 
xmlns:xlink="http://www.w3.org/1999/xlink; 
xsi:schemaLocation="http://www.opengis.net/wps/1.0.0 
http://schemas.opengis.net/wps/1.0.0/wpsAll.xsd;>
  JTS:centroid
  

  geom
  

  

  
  

  result

  


And got


http://www.w3.org/2001/XMLSchema; 
xmlns:ows="http://www.opengis.net/ows/1.1; 
xmlns:wps="http://www.opengis.net/wps/1.0.0; 
xmlns:xlink="http://www.w3.org/1999/xlink; xml:lang="en" service="WPS" 
serviceInstance="http://wms.derbyshire.gov.uk/geoserver/ows?; version="1.0.0">

JTS:centroid
Centroid
Returns the geometric centroid of a geometry. Output is a 
single point.  The centroid point may be located outside the 
geometry.





Failed to retrieve value for input geom
Cannot invoke 
quot;com.fasterxml.jackson.core.ObjectCodec.readTree(com.fasterxml.jackson.core.JsonParser)quot;
 because quot;ocquot; is null






I would appreciate any help anyone could offer or pointing to another list if 
more appropriate.


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