Parsing GML-kodierte WFS-Antwort-XML-Datei

Question

Ich brauche Hilfe, Wetter Details Temperatur etc. aus dieser GML-codierten WMS Antwort XML-Datei zu bekommen. Das bekomme ich vom Wetterdienst, der offene Daten mit Catalog Service für Web (CSW), Web Map Service (WMS) und Web Feature Service (WFS) bereitstellt. Im Gegensatz zu JSON/XML habe ich keine Ahnung, was in dieser Datei passiert. Bitte legen nahe, eine Lösung für Swift 3.

<?xml version="1.0" encoding="UTF-8"?> 
<wfs:FeatureCollection 
    timeStamp="2017-07-31T15:48:01Z" 
    numberMatched="1" 
    numberReturned="1" 
    xmlns:wfs="http://www.opengis.net/wfs/2.0" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:xlink="http://www.w3.org/1999/xlink" 
    xmlns:om="http://www.opengis.net/om/2.0" 
    xmlns:omso="http://inspire.ec.europa.eu/schemas/omso/3.0" 
    xmlns:ompr="http://inspire.ec.europa.eu/schemas/ompr/3.0" 
    xmlns:gml="http://www.opengis.net/gml/3.2" 
    xmlns:gmd="http://www.isotc211.org/2005/gmd" 
    xmlns:gco="http://www.isotc211.org/2005/gco" 
    xmlns:swe="http://www.opengis.net/swe/2.0" 
    xmlns:gmlcov="http://www.opengis.net/gmlcov/1.0" 
    xmlns:sam="http://www.opengis.net/sampling/2.0" 
    xmlns:sams="http://www.opengis.net/samplingSpatial/2.0" 
    xmlns:target="http://xml.fmi.fi/namespace/om/atmosphericfeatures/1.0" 
    xsi:schemaLocation="http://www.opengis.net/wfs/2.0 http://schemas.opengis.net/wfs/2.0/wfs.xsd 
    http://www.opengis.net/gmlcov/1.0 http://schemas.opengis.net/gmlcov/1.0/gmlcovAll.xsd 
    http://www.opengis.net/sampling/2.0 http://schemas.opengis.net/sampling/2.0/samplingFeature.xsd 
    http://www.opengis.net/samplingSpatial/2.0 http://schemas.opengis.net/samplingSpatial/2.0/spatialSamplingFeature.xsd 
    http://www.opengis.net/swe/2.0 http://schemas.opengis.net/sweCommon/2.0/swe.xsd 
    http://inspire.ec.europa.eu/schemas/omso/3.0 http://inspire.ec.europa.eu/schemas/omso/3.0/SpecialisedObservations.xsd 
    http://inspire.ec.europa.eu/schemas/ompr/3.0 http://inspire.ec.europa.eu/schemas/ompr/3.0/Processes.xsd 
    http://xml.fmi.fi/namespace/om/atmosphericfeatures/1.0 http://xml.fmi.fi/schema/om/atmosphericfeatures/1.0/atmosphericfeatures.xsd"> 

    <wfs:member> 
     <omso:GridSeriesObservation gml:id="WFS-l9pen.SrlipXUb8ZfAc8nS2h_8.JTowuYWbbpdOs2_llx4efR060aeWzDtdOufXlmw48rp1w36d3R0629dnTTw36d3THv7ZeWHPlhaWLLn07qmnbltQ_wp37hjvCY2PlzrUi0Kcd06aMmrhnZd2Spp25bUP8KhE4V2nBm07sk7Lh5ZefSth2ackhmZ8u_Tk51mNmbRy2ZujXl899_LJf39svLvy09MOLZliaWzL2y7KnnhlqZmzfjw7MtambTfjSV3XpmcNbbh8RNPPph3Y8tK1dCA1tunnz07s9TL46VjTsM5lbd.TLsrM0aeWzDtZXDDyw7a1I.XfwkZdOfR0rWqZdvDLyw9OvLLWhQ5ZefPryy1oSOu3Tk09PNbVfTuyRNPLLj6ad.6tavp3ZKfDLlyTadZ1fTuyVZtOs6vp3ZK02nWtNw.NO3rtr6d2StCvp3ZI_Xn0rQiZe9Dfp3dK3qm_ph2Q9m_rkh7.2XlW5Xy4emjLyp.duLfsZ1tTN_eHs39ckPf2y8q4JuXJp67Yezf1yQ9_bLyrckac.iHs39ckPf2y8q3qHLLj08NPTD0079zHRXNQ5Zcenhp6Yemnfug7d_Xd0r2pYcmnD00790fZvxYdkHHj67euzD00791d1LDk04emnfumV4OPH129dmHpp37qwwqWHJpw9NO_dOy9KfXlmw48syvBx4.u3rsw9NO_dWGFSw5NOHpp37p2XpT68s2HHlp14OPH129dmHpp37q.KWHJpw9NO_dE05s3Xnlg48fXb12YemnfubnPpv5ZcnHrl5eb.nJXmFm26XTrNv5ZceHn0dOtGnlsw7XTrn15ZsOPK6dcN.nd0dOtvXZ008N.nd0x7.2Xlhz5Wh007ctPpl4T8hNDpp25bW_dlrGq1IYA-"> 
        <om:phenomenonTime> 
       <gml:TimePeriod gml:id="time-interval-1-1"> 
        <gml:beginPosition>2017-07-31T16:00:00Z</gml:beginPosition> 
        <gml:endPosition>2017-08-02T03:00:00Z</gml:endPosition> 
       </gml:TimePeriod> 
      </om:phenomenonTime> 
      <om:resultTime> 
       <gml:TimeInstant gml:id="time-1-1"> 
        <gml:timePosition>2017-07-31T12:00:00Z</gml:timePosition> 
       </gml:TimeInstant> 
      </om:resultTime> 

     <om:procedure xlink:href="http://xml.fmi.fi/inspire/process/hirlam"/> 
      <om:parameter> 
       <om:NamedValue> 
        <om:name xlink:href="http://xml.fmi.fi/inspire/process/hirlam"/> 
        <om:value> 
         <gml:TimeInstant gml:id="analysis-time-1-1"> 
          <gml:timePosition>2017-07-31T12:00:00Z</gml:timePosition> 
         </gml:TimeInstant> 
        </om:value> 
       </om:NamedValue> 
      </om:parameter> 
      <om:observedProperty xlink:href="http://data.fmi.fi/fmi-apikey/e35dc8fd-a855-4db5-a327-418120f64a86/meta?observableProperty=forecast&amp;param=GeopHeight,Temperature,Pressure,Humidity,WindDirection,WindSpeedMS,WindUMS,WindVMS,MaximumWind,WindGust,DewPoint,TotalCloudCover,WeatherSymbol3,LowCloudCover,MediumCloudCover,HighCloudCover,Precipitation1h,PrecipitationAmount,RadiationGlobalAccumulation,RadiationLWAccumulation,RadiationNetSurfaceLWAccumulation,RadiationNetSurfaceSWAccumulation,RadiationDiffuseAccumulation&amp;language=eng"/> 
        <om:featureOfInterest> 
       <sams:SF_SpatialSamplingFeature gml:id="enn-s-1-1-"> 
      <sam:sampledFeature> 
     <target:LocationCollection gml:id="sampled-target-1-1"> 
      <target:member> 
      <target:Location gml:id="forloc-geoid-634963-pos"> 
       <gml:identifier codeSpace="http://xml.fmi.fi/namespace/stationcode/geoid">634963</gml:identifier> 
      <gml:name codeSpace="http://xml.fmi.fi/namespace/locationcode/name">Tampere</gml:name> 
      <gml:name codeSpace="http://xml.fmi.fi/namespace/locationcode/geoid">634963</gml:name> 
      <target:representativePoint xlink:href="#point-634963"/> 
      <target:country codeSpace="http://xml.fmi.fi/namespace/location/country">Finland</target:country> 
      <target:timezone>Europe/Helsinki</target:timezone> 
      <target:region codeSpace="http://xml.fmi.fi/namespace/location/region">Finland</target:region>    
      </target:Location></target:member> 
     </target:LocationCollection> 
     </sam:sampledFeature> 
       <sams:shape> 
        <gml:MultiPoint gml:id="sf-1-1-"> 
         <gml:pointMembers> 
          <gml:Point gml:id="point-634963" srsName="http://www.opengis.net/def/crs/EPSG/0/4258" srsDimension="2"> 
           <gml:name>Tampere</gml:name> 
           <gml:pos>61.49911 23.78712 </gml:pos> 
          </gml:Point> 
         </gml:pointMembers> 
        </gml:MultiPoint> 
       </sams:shape> 
      </sams:SF_SpatialSamplingFeature> 
     </om:featureOfInterest> 
       <om:result> 
     <gmlcov:MultiPointCoverage gml:id="mpcv-1-1"> 
      <gml:domainSet> 
      <gmlcov:SimpleMultiPoint gml:id="mp-1-1" srsName="http://xml.fmi.fi/gml/crs/compoundCRS.php?crs=4258&amp;time=unixtime" srsDimension="3"> 
       <gmlcov:positions> 
       61.49911 23.78712 1501516800 
       61.49911 23.78712 1501520400 
       61.49911 23.78712 1501524000 
       61.49911 23.78712 1501527600 
       61.49911 23.78712 1501531200 
       </gmlcov:positions> 
      </gmlcov:SimpleMultiPoint> 
      </gml:domainSet> 
      <gml:rangeSet> 
      <gml:DataBlock> 
       <gml:rangeParameters/> 
       <gml:doubleOrNilReasonTupleList> 
       113.01 18.26 1007.03 92.74 259.0 3.79 
       113.01 17.79 1007.48 90.02 250.0 3.04 
       113.01 17.13 1007.82 93.62 229.0 2.19 
       113.01 16.42 1008.18 95.53 216.0 2.26 
       113.01 15.9 1008.89 97.09 211.0 2.74 
       </gml:doubleOrNilReasonTupleList> 
      </gml:DataBlock> 
      </gml:rangeSet> 
      <gml:coverageFunction> 
      <gml:CoverageMappingRule> 
       <gml:ruleDefinition>Linear</gml:ruleDefinition> 
      </gml:CoverageMappingRule> 
      </gml:coverageFunction> 
      <gmlcov:rangeType> 
      <swe:DataRecord> 
       <swe:field name="GeopHeight" xlink:href="http://"/> 
       <swe:field name="Temperature" xlink:href="http://"/> 
       <swe:field name="Pressure" xlink:href="http://"/> 
       <swe:field name="Humidity" xlink:href="http://"/> 
       <swe:field name="WindDirection" xlink:href="http://"/> 
       <swe:field name="WindSpeedMS" xlink:href="http://"/> 
       </swe:DataRecord> 
      </gmlcov:rangeType> 
     </gmlcov:MultiPointCoverage> 
     </om:result> 

     </omso:GridSeriesObservation> 
    </wfs:member> 

</wfs:FeatureCollection> 

Answer 1

Ich kann Ihnen nicht mit schnellen helfen, aber ich kann Ihnen vielleicht zeigen, wie diese Datei zu lesen:

Was müssen Sie im Grunde ist diese drei Elemente:

<gmlcov:positions> 
    61.49911 23.78712 1501516800 
    61.49911 23.78712 1501520400 
    61.49911 23.78712 1501524000 
    61.49911 23.78712 1501527600 
    61.49911 23.78712 1501531200 
    </gmlcov:positions> 

    <gml:doubleOrNilReasonTupleList> 
     113.01 18.26 1007.03 92.74 259.0 3.79 
     113.01 17.79 1007.48 90.02 250.0 3.04 
     113.01 17.13 1007.82 93.62 229.0 2.19 
     113.01 16.42 1008.18 95.53 216.0 2.26 
     113.01 15.9 1008.89 97.09 211.0 2.74 
    </gml:doubleOrNilReasonTupleList> 

<swe:DataRecord> 
    <swe:field name="GeopHeight" xlink:href="http://"/> 
    <swe:field name="Temperature" xlink:href="http://"/> 
    <swe:field name="Pressure" xlink:href="http://"/> 
    <swe:field name="Humidity" xlink:href="http://"/> 
    <swe:field name="WindDirection" xlink:href="http://"/> 
    <swe:field name="WindSpeedMS" xlink:href="http://"/> 
</swe:DataRecord> 

der erste sagt Ihnen, die Position und die Zeit der Messung:

61,49911 23,78712 1501516800

Latitude: 61.49911 
Longitude: 23.7812 
Unixtime: 1501516800 --> which translates to: Mon Jul 31 16:00:00 2017 UTC 

Das zweite ist die tatsächlichen Messdaten, und die dritte gibt Ihnen die Bedeutung der Messung.
So ist das, was Sie für die erste Messung erhalten:

GeopHeight | Temperature | Pressure | Humidity | WindDirection | WindSpeedMs 
113.01  | 18.26  | 1007.03 | 92.74 | 259.0   | 3.79 

Ich hoffe, das hilft.