Develop Reference

Incorrect display of a point on the map

I want to add a point to the map with coordinates.
The point is always displayed in the center of the map. Here is my code.
// map creation
this.map = new Map({
view: new View({
center: [0, 0],
zoom: 1,
}),
layers: [
new TileLayer({
source: new OSM(),
}),
],
target: 'ol-map'
});
// adding a point
const point = new Point([+latitude, +longitude]);
const feature = new Feature(point);
const vectorSource = new VectorSource({features: [feature]});
const pointLayer = new VectorLayer({zIndex: 3, source: vectorSource});
this.map.addLayer(pointLayer);
map
When I get the coordinates of a point they are correct
point.getCoordinates()

Make sure you know your projection and your lat lon are the other way around.
let latitude = 41.18702782291;
let longitude = 15.450187402143;
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: [longitude, latitude],
zoom: 7,
})
});
// adding a point
const point = new ol.geom.Point([longitude, latitude]);
const feature = new ol.Feature(point);
const vectorSource = new ol.source.Vector({features: [feature]});
const pointLayer = new ol.layer.Vector({zIndex: 3, source: vectorSource});
map.addLayer(pointLayer);
});

OpenLayers 4 prevent dragging outside bounds in all resolutoins

I need to constrain the map to only drag within the map view but It also needs to work across multiple resolutions:
var extent = [0, 0, 1685, 895];
var projection = new ol.proj.Projection({
units: 'pixels',
extent: extent
});
var map = new ol.Map({
layers: [
new ol.layer.Image({
source: new ol.source.ImageStatic({
url: 'assets/img/map.png',
projection: projection,
imageExtent: [0, 0, 1685, 895]
})
})
],
target: 'map',
view: new ol.View({
projection: projection,
center: ol.extent.getCenter(extent),
zoom: 3,
maxZoom: 5,
minZoom: 3
})
});

How to change a open layer tile source?

I need to change the layer source for openlayer (using open weather api). Currently I am using the following code with no success.
let layer = this.map.getLayers().getArray()[2]
layer.setSource(forecastLayer)
Could you tell me what I am doing wrong?
What is the correct way to update the data source?
renderMapOpenLayer () {
let geo = this.props.geo
// render marker vector
let markerFeature = new ol.Feature({
geometry: new ol.geom.Point(ol.proj.transform([-72.0704, 46.678], 'EPSG:4326', 'EPSG:3857')) // TODO // take lat long from openweather api which should be sotred in the state
})
let markerSource = new ol.source.Vector({
features: [markerFeature]
})
let markerStyle = new ol.style.Style({
image: new ol.style.Icon(({
anchor: [0, 0],
anchorXUnits: 'fraction',
anchorYUnits: 'pixels',
opacity: 0.75,
src: 'assets/pin.svg'
}))
})
let markerLayer = new ol.layer.Vector({
source: markerSource,
style: markerStyle
})
// render OpenStreetMap tile server
var tileLayer = new ol.layer.Tile({
source: new ol.source.OSM()
}, new ol.layer.Vector({
source: new ol.source.Vector({ features: [], projection: 'EPSG:4326' })
}))
// render cloud tile
let cloudLayer = new ol.layer.Tile({
source: new ol.source.XYZ({
url: api.mapTemperature()
})
})
let forecastLayer = new ol.layer.Tile({
source: new ol.source.XYZ({
url: api.forecast()
})
})
setTimeout(function () {
let layer = this.map.getLayers().getArray()[2]
layer.setSource(forecastLayer)
}.bind(this), 3000)
// create map
this.map = new ol.Map({
target: 'map',
layers: [
tileLayer,
markerLayer,
cloudLayer
],
view: new ol.View({
center: ol.proj.transform(geo, 'EPSG:4326', 'EPSG:3857'),
zoom: 4
})
})
}

layer.setSource should do the trick.
function onClick() {
layer.setSource(xyz2);
}
var xyz1 = new ol.source.XYZ({
url: 'https://server.arcgisonline.com/ArcGIS/rest/services/' +
'Demographics/USA_Percent_Over_64/MapServer/tile/{z}/{y}/{x}'
})
var xyz2 = new ol.source.XYZ({
url: 'https://server.arcgisonline.com/ArcGIS/rest/services/' +
'Demographics/USA_Percent_Under_18/MapServer/tile/{z}/{y}/{x}'
})
var layer = new ol.layer.Tile({
source: xyz1
});
var map = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
}),
layer
],
target: 'map',
view: new ol.View({
center: ol.proj.fromLonLat([0, 0]),
zoom: 3
})
});
Here is a working example:
layer.setSource Example

Openlayers source tileWMS? TypeError: a.addEventListener is not a function

I want to add features to my tile map, the problem ocurred when I try to use
ol.source.TileWMS
The error message is:
TypeError: a.addEventListener is not a function
However it works with
ol.source.OSM
My code:
var projection = new ol.proj.Projection({
code: 'EPSG:32719',
extent: [441867.78, 1116915.04, 833978.56, 10000000.00]
});
var extent = [576631.5686027373,8119272.722829757,655823.9357532839,8286730.359291008];
var wmsSource = new ol.source.TileWMS({
url: 'http://192.168.5.94:8080/geoserver/wms',
params: {'LAYERS': 'layer'},
ratio: 1,
serverType: 'geoserver'
});
var wmsLayers = [
new ol.layer.Tile({
extent: extent,
source: wmsSource
})
];
var raster = new ol.layer.Tile({
source: new ol.source.OSM()
});
var source = new ol.source.Vector({wrapX: false});
var vector = new ol.layer.Vector({
source: source
});
var view = new ol.View({
projection: projection,
center: [593169.72792, 8174979.55243],
//center: ol.proj.fromLonLat([-16.5088, -68.1388], projection),
extent: extent,
zoom: 12
});
var map = new ol.Map({
controls: ol.control.defaults().extend([
new ol.control.ScaleLine()
]),
layers: [wmsLayers, vector],
target: 'map',
view: view
});
var draw; // global so we can remove it later
function addInteraction(){
draw = new ol.interaction.Draw({
source: source,
type: 'Point'
});
map.addInteraction(draw);
}
map.on('singleclick', function(evt) {
var coordinate = map.getEventCoordinate(evt.originalEvent);
console.log(coordinate);
document.getElementById('latitud').value = coordinate[0];
document.getElementById('longitud').value = coordinate[1];
addInteraction();
});
addInteraction();
Just change this line to change my layer, when I use OSM, everything is ok... But when I use TileWMS the error appear
layers: [wmsLayers, vector],
Is there a conflict with TileWMS and Vector source?

ol.Map.layers expects an array of layers - your first object in the array is an array.
Try this:
var wmsLayer = new ol.layer.Tile({
extent: extent,
source: wmsSource
});
var map = new ol.Map({
layers: [wmsLayer, vector],
target: 'map',
view: view
});

Openlayers 3 circles from geojson not working with layer tile source different from TileWMS

I am working with openlayers 3 with a layer from mapbox or openstreetmap and I need to draw some circles on it.
I am able to print the circles with a view with a projection EPSG:4326, but then I have no map. Changing the projection with a transform the map is displayed, but the points are all together. The only way I am made it work is using TileWMS as a source, but I am not able to use it in production environment
Here is my code:
version 1: working with TileWMS
var source = new ol.source.GeoJSON({
url: 'geojson url'
});
var pointsLayer = new ol.layer.Vector({
source: source,
style: new ol.style.Style({
image: new ol.style.Circle({
radius: 15,
fill: new ol.style.Fill({color: 'rgba(170,33,33, 0.8)'}),
stroke: new ol.style.Stroke({color: 'rgba(170,33,33, 0.3)', width: 8})
})
})
});
var map = new ol.Map({
target: 'map',
layers: [
new ol.layer.Tile({
title: "Global Imagery",
source: new ol.source.TileWMS({
url: 'http://maps.opengeo.org/geowebcache/service/wms',
params: {LAYERS: 'bluemarble', VERSION: '1.1.1'}
})
}),
pointsSource
],
view: new ol.View({
projection: 'EPSG:4326',
center: [-82.3, -10.65],
zoom: 3
})
});
This is the result
Using mapbox or osm, failing:
var map = new ol.Map({
target: 'map',
layers: [
new ol.layer.Tile({
source: new ol.source.XYZ({
url: 'http://api.tiles.mapbox.com/v4/XXXXX.kcp9cpdn/{z}/{x}/{y}.png?access_token=token'
})
}),
/*
new ol.layer.Tile({
source: new ol.source.OSM()
}),*/
pointsSource
],
view: new ol.View({
projection: 'EPSG:4326',
center: [-82.3, -10.65],
zoom: 3
})
});
This is the result
And finally, changing the view the map is displayed but the circles
var map = new ol.Map({
target: 'map',
layers: [
new ol.layer.Tile({
source: new ol.source.XYZ({
url: 'http://api.tiles.mapbox.com/v4/XXXXX.kcp9cpdn/{z}/{x}/{y}.png?access_token=token'
})
}),
/*
new ol.layer.Tile({
source: new ol.source.OSM()
}),*/
pointsSource
],
view: new ol.View({
center: ol.proj.transform([-82.3, -10.65], 'EPSG:4326', 'EPSG:3857'),
zoom: 3
})
});
And the result
Is there a way to make this work?
Thanks in advance.

I found the solution, here it is for it is helping anyone
Following this answer in gis stackexchange https://gis.stackexchange.com/a/118818/42868 There is an unstable option for the ol.source.GeoJSON object, so adding it in this way made it work
var source = new ol.source.GeoJSON({
url: 'geojson url',
projection: 'EPSG:3857'
});