On Fri, Jan 21, 2011 at 6:24 AM, Roald de Wit <[email protected]> wrote:
> Hi,
>
> In a previous beta, the demo builder for the WPS module (great tool!)
> allowed one to choose from a VECTOR_LAYER and RASTER_LAYER. The current
> RC1 version is lacking these.
>
> Were they left out intentionally? It seemed quite handy to be able to
> point to a layer within this GS instance directly.
>
They are not left out. They are available provided the parameter accepts a
feature collection or a raster.
If the parameter only accepts a geometry they are correctly left out, as
a layer is not a geometry.
Let me try to clarify this as it seems we're going in circles:
- geometry: point, line, polygon, whatever. Just geometry, no attributes
- feature: a set of attributes, one or more of them can be a geometry
(but there are also features without)
- vector layer: a list of features
Some processes (all the JTS ones) can only work against a geometry.
Others only work with vector layers instead, and so on.
At your peril you can turn a list of features into a single geometry
(that will be stored in memory) using the CollectGeometries process,
and then chain the result into a JTS process.
For example, if you want to buffer the geometries of topp:states
layer into a single buffer object you can, from the builder,
first select the JTS process, in the geometry call a subprocess
which will be collectgeometries against topp:states.
Hope this helps
Cheers
Andrea
>
> Regards,
>
> Roald
>
>
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Ing. Andrea Aime
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