<div dir="ltr"><div><div>GDAL gurus,<br> I'm trying to use the AIXM files from the FAA (downloadable here: <a href="https://nfdc.faa.gov/webContent/56DaySub/2014-05-29/aixm5.0.zip" target="_blank">https://nfdc.faa.gov/webContent/56DaySub/2014-05-29/aixm5.0.zip</a>
 ) in QGIS and I'm noticing that there are some that with no warnings or
 complaints just don't produce a polygon. (ogrinfo says "POLYGON EMPTY")<br>
<br></div><div>Two examples are "P-56B DISTRICT OF COLUMBIA.xml" and "POINSETT MOA, SC.xml"<br><br></div><div>Is there some command line 
incantation that I'm missing?  Or perhaps this is a feature of GML/AIXM 
that isn't supported?  I've read that there is little or no GDAL support
 for curves/arcs though I'm unclear as to the current status of that 
support.<br>
</div><div><br></div><div>Here's a snippet from the P-56B file:<br><horizontalProjection><br> <Surface gml:id="Surface1" srsDimension="2" srsName="URN:OGC:DEF:CRS:OGC:1.3:CRS84"><br>


  <patches><br>   <PolygonPatch><br>    <exterior><br>     <Ring><br>      <curveMember><br>       <Curve ns:id="Curve1"><br>        <segments><br>         <CircleByCenterPoint numArc="1"><br>


          <pointProperty><br>           <Point ns:id="Point_1"><br>            <pos>-77.066944 38.921389</pos><br>            </Point><br>           </pointProperty><br>          <radius uom="NM">0.4</radius><br>


         </CircleByCenterPoint><br>        </segments><br>       </Curve><br>      </curveMember><br>     </Ring><br>    </exterior><br>   </PolygonPatch><br>  </patches><br>


 </Surface><br></horizontalProjection><br></div><div><br></div><div>If I should be posting this somewhere else or filing a bug report/feature request please let me know<br><br></div>Thanks!<br></div>-Jesse McGraw<br>
</div>