Can't get BoundingBoxInput working with PyWPS

Question

Can't get BoundingBoxInput working with PyWPS

geotom opened this issue 3 years ago · 2 comments

Description

Hi. I am struggling to get a bounding box as input working in my process. The input is defined as

BoundingBoxInput(
    'area_of_interest',
    'The area of interest',
    abstract='Define the area of interest',
    crss=['epsg:4326', ],
    default=[0,0,0,0],
    min_occurs=1,
    max_occurs=1
)

It produces a correct Describe response for my process, but I cannot get the execution with a BBOX working:

I need to provide default value to my BoundingBoxInput. Otherwise I would always get a

<ows:Exception exceptionCode="MissingParameterValue" locator="area_of_interest" >
   <ows:ExceptionText>area_of_interest</ows:ExceptionText>
</ows:Exception>

Adding a default value (why?) solved my first issue in 1) I now get an input "area_of_interest" in my request handler function. But I cannot access it's properties with request.inputs['area_of_interest'][0].data. Its value is always None

I have no clue what input format I need to provide. So far I used an input like

<wps:Input>
    <ows:Identifier>area_of_interest</ows:Identifier>
    <wps:Data>
        <wps:BoundingBoxData crs="EPSG:4326" dimensions="2">
            <ows:LowerCorner>-90.0 -45.0</ows:LowerCorner>
            <ows:UpperCorner>90.0 45.0</ows:UpperCorner>
        </wps:BoundingBoxData>
    </wps:Data>
</wps:Input>

Is this a bug? Or do I miss something here? I find the BoundingBox input is very purely documented and haven't found one proper example.

Environment

Answer 1 · 2022-03-15T17:28:32.000Z

@geotom I find the boundingbox parameter very confusing and we might have issues both in pywps and owslib.

I have looked for an example:
https://github.com/bird-house/emu/blob/master/emu/processes/wps_bbox.py

Running a get request:

http://localhost:5000/wps?version=1.0.0&service=wps&identifier=bbox&request=execute&datainputs=bbox=46,102,47,103

I get this response:

<wps:ProcessOutputs>
    <wps:Output>
      <ows:Identifier>bbox</ows:Identifier>
      <ows:Title>Bounding Box</ows:Title>
      <ows:Abstract>Bounding Box Output.</ows:Abstract>
      <wps:Data>
        <wps:BoundingBoxData crs="None" dimensions="2">
          <ows:LowerCorner> 46.0 102.0 </ows:LowerCorner>
          <ows:UpperCorner> 47.0 103.0 </ows:UpperCorner>
        </wps:BoundingBoxData>
      </wps:Data>
    </wps:Output>
  </wps:ProcessOutputs>