title: Leaflet how to take individual values ​in GeoJSON?
body: <p>I would like to do this in the Leaflet!
  I have a GeoJSON file with these data:</p>
  
  <pre><code>"type": "Feature",
  "geometry": {
  "type": "MultiPoint",
  "coordinates": [
    [
      -123.77252789,
      44.37857221
    ],
    [
      -123.77317087,
      44.37864694
    ],
    [
      -123.77383407,
      44.37875853
       ]
       ]
     },
      "properties": {
         "title" : "tillicum",
         "path_options" : { "color" : "red" },
  
         "time": [
           1580403952000,
           1580403990000,
           1580404202000
            ],
              "speed": [
                 85,
                 88,
                 90
                 ],
              "altitude": [
                  29,
                  50,
                  69
             ],
               "heading": [
                   0,
                   0,
                   0
             ],
               "horizontal_accuracy": [
                   87,
                   79,
                   59
             ],
               "vertical_accuracy": [
                    0,
                    0,
                    0
             ],
               "raw": []
             },
               "bbox": [
             [
                -124.09386637,
                 44.34348063
             ],
             [
                -124.09386637,
                 44.56531305
             ],
             [
                -123.26148271,
                 44.56531305
             ],
             [
                -123.26148271,
                 44.34348063
             ]
      ]
   };
  </code></pre>
  
  <p>I would like to take the <strong>altitude</strong> properties and, based on their numerical value, assign the radius to a hypothetical circle in the function:</p>
  
  <pre><code>pointToLayer: function (featureData, latlng) {
  
  
   return new L.CircleMarker(latlng, result);
  }
  </code></pre>
  
  <p>I would only need to know how to take these values ​​and assign them to radius.</p>
  
  <p>i'm trying with:</p>
  
  <pre><code>pointToLayer : function(featureData, latlng){
                      if (featureData.properties.altitude) {
        radius = featureData.properties.altitude;
                  } 
              return new L.CircleMarker(latlng, featureData.properties.altitude);
          }
  </code></pre>