So I stumbled across this page:
http://communitymapbuilder.org/display/GEOTDOC/The+axis+order+issue?showComments=true
and this page:
http://wiki.osgeo.org/wiki/Axis_Order_Confusion
The server's getCapabilities response is explicit about what SRS is
being used (EPSG:4326).
The LatLongBoundingBox in the server response names its attributes x and y.
The "Axis Order Confusion" is whether x maps to lat or if x maps to lon.
And it seems that the answer to that question isn't defined in the wfs
protocol and it isn't in the getCapabilities response.
So each wfs server can arbitrarily choose their own x,y -> lat,lon or
x,y->northing,easting mapping without somehow stating what mapping is
being used? The server will tell you what Coordinate Reference System
is being used but not which coordinate is which. That sounds crazy.
So, in my last email I noticed that when I printed out the feature
bounds they didn't seem right.
dataSource.getFeatureSource( typeName ).getBounds())
The bounds have the lat and lon values switched. And I only know they
are switched because I'm expecting the server to have data for the
United States and not Australia.
I'm following along with the wfsexample code so I get my DataStore from
DataStoreFinder. The axis order issue is up to the DataStore and there
doesn't seem to be a way to tell DataStoreFinder what axis order to use
for the server(That might be a useful ConnectionParameter or Hint to be
able to pass DataStoreFinder).
So, if I know that a particular server needs the forceXY flag my only
option is to force all of Geotools to use a particular AxisOrder by using:
System.setProperty("org.geotools.referencing.forceXY", "true");
When I do this the Iterator<SimpleFeature> iterator that is returned has
features in it!
I still get "Incomplete WFS request: Request parameter missing" log
messages. I don't know if those are serious errors or not.
Mar 10, 2010 9:38:19 AM org.geotools.xml.XMLSAXHandler processException
SEVERE: Incomplete WFS request: 'Request' parameter missing.
org.geotools.xml.filter.FilterComplexTypes$ServiceExceptionType.getValue(FilterComplexTypes.java:1669)
org.geotools.xml.handlers.ComplexElementHandler.endElement(ComplexElementHandler.java:157)
org.geotools.xml.XMLSAXHandler.endElement(XMLSAXHandler.java:266)
org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown
Source)
org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown
Source)
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source)
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
javax.xml.parsers.SAXParser.parse(Unknown Source)
javax.xml.parsers.SAXParser.parse(Unknown Source)
org.geotools.xml.DocumentFactory.getInstance(DocumentFactory.java:140)
org.geotools.data.wfs.v1_0_0.WFSFeatureReader.run(WFSFeatureReader.java:125)
Mar 10, 2010 9:38:19 AM org.geotools.xml.XMLSAXHandler endElement
WARNING: Incomplete WFS request: 'Request' parameter missing.
Mar 10, 2010 9:38:19 AM org.geotools.xml.XMLSAXHandler endElement
WARNING: Line 4 Col 72
Mar 10, 2010 9:38:19 AM
org.geotools.data.wfs.v1_0_0.NonStrictWFSStrategy
createFeatureReaderPOST
WARNING: java.io.IOException: org.geotools.ows.ServiceException:
Incomplete WFS request: 'Request' parameter missing.
On 3/8/2010 3:04 PM, Ryan Ripken wrote:
I started capturing the http traffic with wireshark so that I could
see the exact network query as it goes across the wire.
I want to query for
Envelope bbox = new Envelope(
-121.618652,-121.313782,38.231708,38.440682 );
The request that actually goes across the wire looks like:
serverurl.wfs?SERVICE=WFS&VERSION=1.0.0&REQUEST=GetFeature&BBOX=-121.313782,-66.00001246666649,18.000004648959784,38.231708&TYPENAME=MapunitPoly
Notice the -66 and the 18 in the network query - I didn't set those.
Geotools must intersect the requested bounds with the reported bounds
from the GetCapabilities values.
When I hit the getCapabilities link the layer I'm interested in
reports its LatLongBoundingBox as:
<LatLongBoundingBox minx="-178.5" miny="18" maxx="-66" maxy="72"/>
But when I print out these bounds in Geotools...
System.out.println( " FeatureSource Bounds:"+data.getFeatureSource(
typeName ).getBounds());
I see:
FeatureSource Bounds:ReferencedEnvelope[18.000004666553526 :
71.99999845030135, -178.49999080798324 : -66.00001246666649]
It seems the X and the Y values are switched.
If I hand change the generated request to:
serverurl.wfs?SERVICE=WFS&VERSION=1.0.0&REQUEST=GetFeature&
BBOX=-121.323782,38.231708,-121.313782,38.440682&TYPENAME=MapunitPoly
the server gives me a bunch of valid looking polygons.
Is there something I'm doing wrong?
On 3/5/2010 3:02 PM, Jody Garnett wrote:
SERVICE=WMS&REQUEST=GetCapabilities
WFS supports several kinds of requests:
- GetCapabilities describes what sevices and data the WFS procides
- DescribeFeatureType produces an XML Schema defining the attributes being
published
- GetFeatures is used when requesting XML content (that is valid against the
schema from DescribeFeatureType)
Usually the DescribeFeatureType makes use of the Geographic Markup Language ideas for
Geometry etc...; in that respect the XML content reuturned by GetFeatures is considered
to be "GML".
Jody
On 05/03/2010, at 1:24 PM, Ryan Ripken wrote:
I'm trying to use Geotools 2.5.5 and the WFSExample.java example file to
connect to a public WFS server and download a polygon shape file.
When I get to "Step 5" I get a ServiceException about the "Request"
parameter missing.
Is there something I need to do to add a Request parameter to my query?
I've gone through the first couple pages of Google results and I found
some reports that MapServer required "Service=wfs" added to the url.
http://trac.osgeo.org/mapserver/ticket/1262
http://lists.osgeo.org/pipermail/mapserver-users/2007-November/026301.html
Is that my problem?
This page includes an example wfs link on the server I'd like to use,
http://sdmdataaccess.nrcs.usda.gov/WebServiceHelp.aspx . The example
link seems to work and includes SERVICE=WFS in the getFeature request.
So, assuming this is the problem, Is there something easy I might do in
the Geotools client code to work around it?
Perhaps an api I could use to modify the url being generated before the
request is executed? Or a way to add additional parameters to the
request? Or perhaps a class I could extend and a method to override
where I could recognize the hostname and add the parameter?
I stepped into the WFS feature code with the debugger but it isn't
immediately obvious to me where things are going wrong or where I might
be able to modify the requests. Appreciate any feedback - even if it is
just "yeah, thats your problem"
Thanks,
Ryan
Here is the output of my program.
**** Step 1: Connection Parameters
**** Step 2: Connection
**** Step 3: Discovery
title:NRCS Soil Data Mart Data Access Web Feature Service WGS84
typeNames[0]=MapunitPoly
typeNames[1]=MapunitPolyNoGeometry
typeNames[2]=MapunitLine
typeNames[3]=MapunitPoint
typeNames[4]=MapunitPolyExtended
typeNames[5]=SurveyAreaPoly
using:MapunitPoly
Schema Attributes:8
attributeDescriptor[0]=multiPolygon
attributeDescriptor[1]=AREASYMBOL
attributeDescriptor[2]=SPATIALVERSION
attributeDescriptor[3]=MUSYM
attributeDescriptor[4]=MUKEY
attributeDescriptor[5]=SHAPE
attributeDescriptor[6]=OBJECTID
attributeDescriptor[7]=OBJECTID
**** Step 4: target:MapunitPoly
FeatureSource Bounds:ReferencedEnvelope[18.0 : 72.0, -178.5 : -66.0]
**** Step 5: Query
GeometryDescriptor LocalName: multiPolygon
Built filter:[ multiPolygon intersects POLYGON ((-121.618652
38.231708, -121.313782 38.231708, -121.313782 38.440682, -121.618652
38.440682, -121.618652 38.231708)) ]
Mar 4, 2010 5:32:07 PM org.geotools.xml.XMLSAXHandler processException
SEVERE: Incomplete WFS request: 'Request' parameter missing.
org.geotools.xml.filter.FilterComplexTypes$ServiceExceptionType.getValue(FilterComplexTypes.java:1669)
org.geotools.xml.handlers.ComplexElementHandler.endElement(ComplexElementHandler.java:157)
org.geotools.xml.XMLSAXHandler.endElement(XMLSAXHandler.java:266)
org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown
Source)
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source)
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown
Source)
javax.xml.parsers.SAXParser.parse(Unknown Source)
javax.xml.parsers.SAXParser.parse(Unknown Source)
org.geotools.xml.DocumentFactory.getInstance(DocumentFactory.java:140)
org.geotools.data.wfs.v1_0_0.WFSFeatureReader.run(WFSFeatureReader.java:125)
Mar 4, 2010 5:32:07 PM org.geotools.xml.XMLSAXHandler endElement
WARNING: Incomplete WFS request: 'Request' parameter missing.
Mar 4, 2010 5:32:07 PM org.geotools.xml.XMLSAXHandler endElement
WARNING: Line 4 Col 72
Mar 4, 2010 5:32:07 PM org.geotools.data.wfs.v1_0_0.NonStrictWFSStrategy
createFeatureReaderPOST
WARNING: java.io.IOException: org.geotools.ows.ServiceException:
Incomplete WFS request: 'Request' parameter missing.
Mar 4, 2010 5:32:07 PM org.geotools.xml.XMLSAXHandler processException
SEVERE: Invalid request. Unable to determine spatial filter. (Unknown,
Unknown, Unknown).
org.geotools.xml.filter.FilterComplexTypes$ServiceExceptionType.getValue(FilterComplexTypes.java:1669)
org.geotools.xml.handlers.ComplexElementHandler.endElement(ComplexElementHandler.java:157)
org.geotools.xml.XMLSAXHandler.endElement(XMLSAXHandler.java:266)
org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown
Source)
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source)
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown
Source)
javax.xml.parsers.SAXParser.parse(Unknown Source)
javax.xml.parsers.SAXParser.parse(Unknown Source)
org.geotools.xml.DocumentFactory.getInstance(DocumentFactory.java:140)
org.geotools.data.wfs.v1_0_0.WFSFeatureReader.run(WFSFeatureReader.java:125)
Mar 4, 2010 5:32:07 PM org.geotools.xml.XMLSAXHandler endElement
WARNING: Invalid request. Unable to determine spatial filter. (Unknown,
Unknown, Unknown).
Mar 4, 2010 5:32:07 PM org.geotools.xml.XMLSAXHandler endElement
WARNING: Line 4 Col 103
Mar 4, 2010 5:32:07 PM org.geotools.data.wfs.v1_0_0.NonStrictWFSStrategy
createFeatureReaderGET
WARNING: java.io.IOException: org.geotools.ows.ServiceException: Invalid
request. Unable to determine spatial filter. (Unknown, Unknown, Unknown).
java.util.NoSuchElementException: Could not aquire
feature:java.io.IOException: org.geotools.ows.ServiceException: Invalid
request. Unable to determine spatial filter. (Unknown, Unknown, Unknown).
at
org.geotools.data.store.NoContentIterator.next(NoContentIterator.java:56)
at
org.geotools.data.store.NoContentIterator.next(NoContentIterator.java:41)
at hec.dgt.plugins.WFSExample.dataAccess(WFSExample.java:125)
at hec.dgt.plugins.WFSExample.main(WFSExample.java:52)
Caused by: java.io.IOException: org.geotools.ows.ServiceException:
Invalid request. Unable to determine spatial filter. (Unknown, Unknown,
Unknown).
at org.geotools.xml.gml.FCBuffer.hasNext(FCBuffer.java:326)
at
org.geotools.data.wfs.v1_0_0.WFSFeatureReader.loadElement(WFSFeatureReader.java:189)
at
org.geotools.data.wfs.v1_0_0.WFSFeatureReader.hasNext(WFSFeatureReader.java:178)
at
org.geotools.data.ReTypeFeatureReader.hasNext(ReTypeFeatureReader.java:190)
at
org.geotools.data.wfs.v1_0_0.NonStrictWFSStrategy.createFeatureReaderGET(NonStrictWFSStrategy.java:134)
at
org.geotools.data.wfs.v1_0_0.NonStrictWFSStrategy.createFeatureReader(NonStrictWFSStrategy.java:101)
at
org.geotools.data.wfs.v1_0_0.StrictWFSStrategy.access$101(StrictWFSStrategy.java:60)
at
org.geotools.data.wfs.v1_0_0.StrictWFSStrategy$StrictFeatureReader.nextReader(StrictWFSStrategy.java:222)
at
org.geotools.data.wfs.v1_0_0.StrictWFSStrategy$StrictFeatureReader.init(StrictWFSStrategy.java:171)
at
org.geotools.data.wfs.v1_0_0.StrictWFSStrategy$StrictFeatureReader.<init>(StrictWFSStrategy.java:145)
at
org.geotools.data.wfs.v1_0_0.StrictWFSStrategy.createFeatureReader(StrictWFSStrategy.java:84)
at
org.geotools.data.wfs.v1_0_0.NonStrictWFSStrategy.getFeatureReader(NonStrictWFSStrategy.java:72)
at
org.geotools.data.wfs.v1_0_0.WFS_1_0_0_DataStore.getFeatureReader(WFS_1_0_0_DataStore.java:740)
at
org.geotools.data.DefaultFeatureResults.reader(DefaultFeatureResults.java:210)
at
org.geotools.data.store.DataFeatureCollection.openIterator(DataFeatureCollection.java:229)
at
org.geotools.data.store.DataFeatureCollection.iterator(DataFeatureCollection.java:199)
at hec.dgt.plugins.WFSExample.dataAccess(WFSExample.java:122)
... 1 more
Caused by: org.geotools.ows.ServiceException: Invalid request. Unable
to determine spatial filter. (Unknown, Unknown, Unknown).
at org.geotools.xml.XMLSAXHandler.endElement(XMLSAXHandler.java:274)
at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown
Source)
at
org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown
Source)
at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source)
at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown
Source)
at javax.xml.parsers.SAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(Unknown Source)
at
org.geotools.xml.DocumentFactory.getInstance(DocumentFactory.java:140)
at
org.geotools.data.wfs.v1_0_0.WFSFeatureReader.run(WFSFeatureReader.java:125)
Caused by: org.geotools.ows.ServiceException: Invalid request. Unable
to determine spatial filter. (Unknown, Unknown, Unknown).
at
org.geotools.xml.filter.FilterComplexTypes$ServiceExceptionType.getValue(FilterComplexTypes.java:1669)
at
org.geotools.xml.handlers.ComplexElementHandler.endElement(ComplexElementHandler.java:157)
at org.geotools.xml.XMLSAXHandler.endElement(XMLSAXHandler.java:266)
... 13 more
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Try the new software tools for yourself. Speed compiling, find bugs
proactively, and fine-tune applications for parallel performance.
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