sourceSRS is not required, but run-time exception

[bartvde]

here is another similar case @dwins Reproject takes optional sourceCRS and targetCRS:

which seems a bit weird, I'd expect targetCRS to be required actually, and sourceCRS to be an optional override for the dataset CRS. But they are both marked optional:

            <Input maxOccurs="1" minOccurs="0">
                <ows:Identifier>sourceCRS</ows:Identifier>
                <ows:Title>sourceCRS</ows:Title>
                <ows:Abstract>Coordinate reference system of input geometry</ows:Abstract>
                <LiteralData>
                    <ows:AnyValue/>
                </LiteralData>
            </Input>
            <Input maxOccurs="1" minOccurs="0">
                <ows:Identifier>targetCRS</ows:Identifier>
                <ows:Title>targetCRS</ows:Title>
                <ows:Abstract>Target coordinate reference system to use for
                    reprojection</ows:Abstract>
                <LiteralData>
                    <ows:AnyValue/>
                </LiteralData>
            </Input>

when you don't provide targetSRS, you get a run-time exception though:

<?xml version="1.0" encoding="UTF-8"?><wps:ExecuteResponse xmlns:wps="http://www.opengis.net/wps/1.0.0" xmlns:ows="http://www.opengis.net/ows/1.1" xmlns:xlink="http://www.w3.org/1999/xlink" xml:lang="en" service="WPS" serviceInstance="http://sfmta.demo.opengeo.org:80/geoserver/ows?" version="1.0.0"><wps:Process wps:processVersion="1.0.0"><ows:Identifier>geo:reproject</ows:Identifier><ows:Title>Reproject Geometry</ows:Title><ows:Abstract>Reprojects a given geometry into a supplied coordinate reference system.</ows:Abstract></wps:Process><wps:Status creationTime="2014-10-02T08:25:40.422Z"><wps:ProcessFailed><ows:ExceptionReport version="1.1.0"><ows:Exception exceptionCode="NoApplicableCode"><ows:ExceptionText>Process failed during execution
Reprojection faiiled
Argument &amp;quot;sourceCRS&amp;quot; should not be null.</ows:ExceptionText></ows:Exception></ows:ExceptionReport></wps:ProcessFailed></wps:Status></wps:ExecuteResponse>

request is:

<p0:Execute xmlns:p0="http://www.opengis.net/wps/1.0.0" service="WPS" version="1.0.0"><p1:Identifier xmlns:p1="http://www.opengis.net/ows/1.1">geo:reproject</p1:Identifier><p0:DataInputs><p0:Input><p1:Identifier xmlns:p1="http://www.opengis.net/ows/1.1">geometry</p1:Identifier><p0:Data><p0:ComplexData mimeType="application/wkt">POLYGON((-8453323.832114212 -234814.55089206155,-4070118.882129064 234814.55089206155,-4696291.017841227 -3835304.331237004,-8453323.832114212 -234814.55089206155))</p0:ComplexData></p0:Data></p0:Input><p0:Input><p1:Identifier xmlns:p1="http://www.opengis.net/ows/1.1">targetCRS</p1:Identifier><p0:Data><p0:LiteralData>EPSG:4326</p0:LiteralData></p0:Data></p0:Input></p0:DataInputs><p0:ResponseForm><p0:RawDataOutput mimeType="application/wkt"><p1:Identifier xmlns:p1="http://www.opengis.net/ows/1.1">result</p1:Identifier></p0:RawDataOutput></p0:ResponseForm></p0:Execute>

[bartvde]

maybe sourceCRS is required if GeoServer cannot get the SRS from the input geometry, such as WKT. So this would explain the way it is currently.

[bartvde]

yes this must be the case, so closing