Re: [geomesa-users] Geomesa:Cassandra Joining two tables and get WMS lay

[Jim Hughes <jhughes@xxxxxxxx>]

Hi Ankur,

This is a good question.  I haven't thought to try the geomesa:Join WPS in a Style.  The good news is that it ought to work.

If you can make it work in the WPS Request Builder, you likely have the XML/input for both layers.  If one of those is static, you could hardcode it into the SLD for the secondary source.

From looking at the code for the DensityProcess and heatmap[1], it looks like the SLD might have a literal called 'data' which represents the WMS request.  That might give you some room to select what should be from GeoMesa in C*.  

Perhaps you take a look at the source for the DensityProcess, the SLD, and the JoinProcess to see if you can find another idea or two to try?

The idea of joining makes me think of the GeoServer Cross-Layer Filtering plugin[2].  That may or may not apply here.

Cheers,

Jim

1. https://github.com/locationtech/geomesa/blob/master/geomesa-process/geomesa-process-vector/src/main/scala/org/locationtech/geomesa/process/analytic/DensityProcess.scala
https://github.com/locationtech/geomesa/blob/master/docs/tutorials/_static/geomesa-quickstart-storm/heatmap.sld
https://github.com/locationtech/geomesa/blob/master/geomesa-process/geomesa-process-vector/src/main/scala/org/locationtech/geomesa/process/query/JoinProcess.scala

2.  https://docs.geoserver.org/stable/en/user/extensions/querylayer/index.html

On 7/8/19 5:53 AM, Ankur Agarwal wrote:

Hi All,

I am using geomesa-Cassandra with geoserver. I want to join two tables (spatial-spatial or spatial-temporal) and get the output as WMS layer.

For this, I was trying to use geomesa:Join function of WPS plugin in GeoServer. It works fine if I use it in Demos-WPS request Builder. But to get  WMS layer output, I was using it in Transformation tag in SLD styles.
 I am unable to figure out how to provide two layers as input as I can assign this style to one layer and that layer is only getting passed in as input layer.

Please suggest how to pass two layers as input in this function.or Is there any better method to  join two tables in geomesa-cassandra and get the output as WMS layer?

PFA for reference.

Thanks.

Ankur

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