[mapserver-users] OGR doesn't grok GML3?

[Burgholzer,Robert]

This is a re-post, perhaps my title wasn't concise enough to grab
attention.  This is related to pulling WFS-base National Hydrography
Dataset.  

Is it true that ogr2ogr only understands the GML2? If so, any ideas on
the difficulty of amending this situation?

 

More information from the maintainer of the WFS service.  If what they
say is correct, ogr2ogr doesn't grok GML3?  See below if interested:

 

#############################################

##  Begin Correspondence with NHD WFS Contact   #

#############################################

 

For the framework data our server raises an exception if the output 

format is not GML3 because the framework schemas:

 

http://frameworkwfs.usgs.gov/framework/schemas/gmlsf1/

 

are only defined for GML3.  So, if you request GML2 output, the server 

raises an exception since it cannot validate GML2 input or output 

because the GML2 schemas do not exist.

 

> I have made progress enough to load point layers, such as , however, 

> when trying to load some of the polygon layers, such as, , I get the 

> following error:

> 

> OGR error. Missing outerBoundary Is property on Polygon.

 

You may have trouble accessing the framework data (which is only 

available in GML3) with OGR because OGR can only handles GML2 (at least 

that is my understanding).

 

The error you indicate kinda bears out my understanding ...

 

<gml:outerBoundaryIs> is an element defined in GML2 but deprecated in 

GML3.  The corresponding GML3 element is <gml:exterior> which is what 

our server generates when the requested output format is GML3.

 

> 

> BTW - what is the status of this product?

 

The CubeWerx WFS is part of CubeSERV which is a production product.

 

Are you using ogr2ogr to try and convert the output to something else? 

If so, let me know which output format you are trying to convert the 

data to and I may be able to come up with another way to get that 

format.  Or at least tweak our server to allow you to use ogr. 

 

#############################################

##   End Correspondence with NHD WFS Contact   ##

#############################################

 

 

Robert W. Burgholzer

Surface Water Modeler

Office of Water Supply and Planning

Virginia Department of Environmental Quality

rwburgholzer at deq.virginia.gov

804-698-4405

Open Source Modeling Tools:

http://sourceforge.net/projects/npsource/

-----Original Message-----
From: mapserver-users-bounces at lists.osgeo.org
[mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of
Burgholzer,Robert
Sent: Friday, June 06, 2008 12:58 PM
To: mapserver-users at lists.osgeo.org
Subject: [mapserver-users] troubleshooting WFS LINE output

 

I am retrieving some WFS layers, and having a bit of trouble with a LINE
layer (not to mention a bit more trouble with a POLYGON layer, but that
will hold for now).  The data set that I am working with has much
promise if I can get it to work, it is the National Hydrography Database
or NHD.

 

The GML file is retrieved, it appears to be in coordinates that are
within my extent, and the map loads just fine, except it does not show
any LINE.  I am able to load a point from this source, no worries, but
the LINE has thus far eluded me.   I will attach my line block from my
mapfile, in case I have made a real rookie mistake here, but any insight
into how to troubleshoot otherwise would be welcome (I have debugging
turned on, and am receiving no errors related to the line).

 

 

LAYER

   NAME nhd_wfs

   TYPE LINE

   #TYPE POINT

   STATUS ON

   DEBUG ON

   CONNECTIONTYPE WFS

   CONNECTION
"http://frameworkwfs.usgs.gov/framework/wfs/wfs.cgi?OutputFormat=GML3L1&
srsName=EPSG:4326"

   METADATA

      #"wfs_typename"          "HydroElementWBMD"

      #"wfs_typename"          "HydroElementPTMD"

      "wfs_typename"          "HydroElementLIHI"

      "wfs_version"           "1.0.0"

      "wfs_request_method"    "GET"

      "wfs_connectiontimeout" "240"

   END

   PROJECTION

      "init=epsg:4326"

   END

   CLASS

      NAME "None"

      STYLE

         #SYMBOL 'circle'

         #SIZE 7

         COLOR 42 151 220

         #BACKGROUNDCOLOR 42 151 220

         #OUTLINECOLOR 42 151 220

      END

   END

END # Layer

 

Robert W. Burgholzer

Surface Water Modeler

Office of Water Supply and Planning

Virginia Department of Environmental Quality

rwburgholzer at deq.virginia.gov

804-698-4405

Open Source Modeling Tools:

http://sourceforge.net/projects/npsource/

 

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