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Delete points on the map to remain only one for each plane in OpenLayers

Geographic Information Systems Asked by CoderCoder42 on March 13, 2021

I’m trying to put on the map the route of an ads-b plane, I’ve managed this so far …

Poblema is as follows puts all the points since I started to intercept him until the end what is not correct should remain only the last point that shows his exact real time location.

function addMarker(coordinates, data_no) {
            

            //console.log(coordinates);
            //var marker = new ol.Feature(new ol.geom.Point(coordinates).transform('EPSG:4326', 'EPSG:31700'));
            var marker = new ol.Feature(new ol.geom.Point(coordinates).transform('EPSG:4326', map.getView().getProjection()));
            //console.log(marker);
            var zIndex = 1;
            
            
            var style_aircraft = new ol.style.Style({
                                      image: new ol.style.Icon(({
                                        anchor: [0.5, 36], 
                                        anchorXUnits: "fraction",
                                        anchorYUnits: "pixels",
                                        opacity: 1,
                                        src: "img/airport.png", 
                                        zIndex: zIndex
                                      })),
                                      zIndex: zIndex,
                                      text: new ol.style.Text({
                                        font: 'bold 16px "Open Sans", "Arial Unicode MS", "sans-serif"',
                                        placement: 'center',
                                        fill: new ol.style.Fill({
                                          color: 'black'
                                        })
                                      })
                                    })
            

            var data = data_no[0]+"/"+data_no[1]+"/"+data_no[2]+"/"+data_no[3];
            
            style_aircraft.getText().setText(data);
            marker.setStyle(style_aircraft);
            vectorSource.aircraft.addFeature(marker);
              
          }

enter image description here

One Answer

If data_no[0] is the id of the plane you could use

        marker.setId(data_no[0]);
        var old_marker = vectorSource.aircraft.getFeatureById(data_no[0]);
        if (old_marker) {
            vectorSource.aircraft.removeFeature(old_marker);
        }
        vectorSource.aircraft.addFeature(marker);

Correct answer by Mike on March 13, 2021

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