Error calling WFSClient$new

[bwcompton]

I'm using the following call on a GeoServer:

library(ows4R)
request <- 'https://umassdsl.webgis1.com/geoserver/wfs?service=wfs&request=GetCapabilities'
info <- WFSClient$new(request, serviceVersion = '2.0.0', logger = 'DEBUG')

And I get this error:

Error in names(namespaces) <- rep("", length(namespaces)) : 
  attempt to set an attribute on NULL

Everything works fine when I use a different server. Pasting the request into the browser gives a whole lot of XML, so there's access. The server is on AcuGIS, running GeoServer WFS v. 1.0.0, 1.1.0, and 2.0.0. I get the error with all three versions.

[eblondel]

Hello @bwcompton the url should only be the base URL for the service, ie: https://umassdsl.webgis1.com/geoserver/wfs or eventually https://umassdsl.webgis1.com/geoserver/ows?service=WFS (using the global OWS - OGC Web Service -endpoint)

Check this, it works:

library(ows4R)
request <- 'https://umassdsl.webgis1.com/geoserver/wfs'
info <- WFSClient$new(request, serviceVersion = '2.0.0', logger = 'DEBUG')

#list feature types
fts = info$capabilities$getFeatureTypes(pretty = T)

#get features example
sf_test = info$getFeatures("ne:disputed_areas")

BTW, note that although it would be recommended to use WFS version 2.0.0, GML types MultiSurface (handled through WFS 2.0) are then not well supported in the sf package. You can use lower version to stick with MULTIPOLYGON types, or eventually do cast geometry types:

library(magrittr)
sf_test2 = sf::st_cast(sf_test, "GEOMETRYCOLLECTION") %>% sf::st_collection_extract("POLYGON")

[bwcompton]

Got it--I now see where I went wrong. The server that worked for me was tolerant of my ill-formed request; GeoServer is not.

Thanks for helping push me up the learning curve--I'm still at the steep part.

[eblondel]

Great, feel free to ask more questions here if you have issues.