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VisualizaçõesCant show my features in openlayers. Does someone know how to solve this?
I have been struggling with my projections for a few weeks now. At the beginning I could show my features but they appear in jemen (they are supposed to be in Italy). After I realised my coordinates were being inversed, for example my coordinate [41.18702782291,15.450187402143] (which is in Italy) was displaying in [15.450187402143, 41.18702782291] (which is in jemen), I decided to invert the coordinates of the multipolygons of my geometries so that now I have the [15.450187402143, 41.18702782291] format. I don´t know what happened but now I cant see my features shown in the map.
I have an object geojson with my features and this is my code:
var myview = new View({
center: [15.450187402143, 41.18702782291],
projection: 'EPSG:4326',
zoom: 6
})
var mylayer = new TileLayer({
source: new OSM()
})
var layer = [mylayer]
const map = new Map({
target: 'map',
layers: layer,
view: myview
});
const vectorSource = new VectorSource({
format: new ol.format.GeoJSON(),
features: (new ol.format.GeoJSON()).readFeatures(geoJson, {dataProjection: 'EPSG:4326',
featureProjection: map.getView().getProjection()})
//EPSG:32633 - WGS 84 / UTM zone 33N
//features: new GeoJSON().readFeatures(geoJson, {dataProjection: 'EPSG:4326', FeatureProjection: map.getView().getProjection()})
});
console.log(geoJson);
console.log(vectorSource.getFormat());
vectorSource.addFeatures((vectorSource.getFormat()).readFeatures(geoJson));
console.log("1");
const vectorLayer = new VectorLayer({
source: vectorSource
});
map.addLayer(vectorLayer);
const numFeatures = vectorLayer.getSource().getFeatures().length;
console.log("Count right after construction: " + numFeatures);
The final lines show that the features are in the source and it is correctly getting them.
1 Respostas
Responde à pergunta0
This works fine for me.
const geoJson = {
"type": "Feature",
"properties": {
"name": "Coors Field",
"amenity": "Baseball Stadium",
"popupContent": "This is where the Rockies play!"
},
"geometry": {
"type": "Point",
"coordinates": [15.450187402143, 41.18702782291]
}
};
let map;
$(document).ready(function() {
// CREATE MAP
map = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.OSM({
wrapX: false
}),
projection: 'EPSG:4326',
visible: true
})
],
target: 'map',
view: new ol.View({
projection: 'EPSG:4326',
center: [15.450187402143, 41.18702782291],
zoom: 7,
})
});
const vectorSource = new ol.source.Vector({
format: new ol.format.GeoJSON(),
features: (new ol.format.GeoJSON()).readFeatures(geoJson, {dataProjection: 'EPSG:4326',
featureProjection: map.getView().getProjection()}),
//EPSG:32633 - WGS 84 / UTM zone 33N
//features: new GeoJSON().readFeatures(geoJson, {dataProjection: 'EPSG:4326', FeatureProjection: map.getView().getProjection()})
});
vectorSource.addFeatures((vectorSource.getFormat()).readFeatures(geoJson));
const vectorLayer = new ol.layer.Vector({
source: vectorSource,
style: new ol.style.Style({
image: new ol.style.Circle({
radius: 10,
fill: new ol.style.Fill({color: 'red'})
})
})
});
map.addLayer(vectorLayer);
});