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<p class="MsoNormal">I’m querying an ArcGIS service obtain polygon data, however the service seems to define Island multi-polygons objects as single polygons with multiple exterior rings. This creates invalid OGC geometries and is causing processing problems
in my workflow.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">He’s the service and a validation test showing the polygon is not valid:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">ogrinfo -dialect sqlite -sql "SELECT TA2013_V1_00_NAME, ST_IsValid(GEOMETRY) FROM OGRGeoJSON"
<a href="http://maps.stats.govt.nz/wss/service/arcgis1/guest/Boundaries/2013_Geographies/MapServer/9/query?f=json&objectIds=36&returnGeometry=true&outSR=4167">
http://maps.stats.govt.nz/wss/service/arcgis1/guest/Boundaries/2013_Geographies/MapServer/9/query?f=json&objectIds=36&returnGeometry=true&outSR=4167</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">GEOS warning: Hole lies outside shell at or near point 174.78189611685229 -41.077770200471164<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">Layer name: SELECT<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">Geometry: None<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">Feature Count: 1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">Layer SRS WKT:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">(unknown)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">TA2013_V1_00_NAME: String (0.0)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">ST_IsValid(GEOMETRY): Integer (0.0)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New"">OGRFeature(SELECT):0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New""> TA2013_V1_00_NAME (String) = Porirua City<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New""> ST_IsValid(GEOMETRY) (Integer) = 0<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is this a bug in the data from the service, or just the way the Esri defines geometry objects (and therefor an OGR bug)? I can’t see a definition for multi-polygons in Esri API docs:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="http://resources.arcgis.com/en/help/arcgis-rest-api/index.html#//02r3000000n1000000">http://resources.arcgis.com/en/help/arcgis-rest-api/index.html#//02r3000000n1000000</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Cheers,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:#37AD47;mso-fareast-language:EN-NZ">Jeremy Palmer<br>
</span></b><b><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:#00ACCD;mso-fareast-language:EN-NZ">LINZ Data Service Manager</span></b><b><span lang="EN-US" style="font-size:9.0pt;color:#37AD47;mso-fareast-language:EN-NZ"><br>
</span></b><b><span lang="EN-US" style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:#00ACCD;mso-fareast-language:EN-NZ">Landonline & Geospatial Services
</span></b><b><span lang="EN-US" style="font-size:9.0pt;mso-fareast-language:EN-NZ"><o:p></o:p></span></b></p>
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