Add a WFS layer into an OpenLayers map - openlayers-3

I am having a lot of hard time trying to add a WFS layer from a Geoserver instance in my localhost. I am following the original example from OpenLayers website a-la-lettre just changing the URL value.
Here is the code:
<!doctype html>
<html lang="en">
<head>
<link rel="stylesheet" href="OpenLayers-v4.1.1/ol.css" type="text/css">
<style>
.map {
height: 400px;
width: 100%;
}
</style>
<script src="OpenLayers-v4.1.1/ol.js" type="text/javascript"></script>
<title>OpenLayers Map</title>
</head>
<body>
<h2>My Map</h2>
<div id="map" class="map"></div>
<script type="text/javascript">
var vectorSource = new ol.source.Vector({
format: new ol.format.GeoJSON(),
url: 'http://localhost/geoserver/cite/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=cite:Communes&outputFormat=application%2Fjson',
strategy: ol.loadingstrategy.bbox
});
var vector = new ol.layer.Vector({
source: vectorSource,
style: new ol.style.Style({
stroke: new ol.style.Stroke({
color: 'rgba(0, 0, 255, 1.0)',
width: 2
})
})
});
var map = new ol.Map({
layers: [vector],
target: document.getElementById('map'),
view: new ol.View({
center: [30.158, -1.993],
maxZoom: 19,
zoom: 12
})
});
map.zoomToMaxExtent();
</script>
</body>
</html>
The problem is that my map is empty. I am only getting the ZoomIn/ZoomOut controls.
From googling the problem, I saw a mention of the cross-site-request issue which I resolved by adding the following code in the Geoserver-root/WEB_INF/web.xml:
<filter>
<filter-name>CorsFilter</filter-name>
<filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CorsFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
However, this didn't solve my problem.
Can anyone give me hints of what I am missing?

Related

Get Features in heatmap openlayers3

I want to get all features when I click on heat map in openlayers 3...It is possible or not? How to count the features in heat map and give heat map total count features label? thanks

Openlayers3 can do this easily,You can use getFeatures() to get all the features.
var features = heatlayer.getSource().getFeatures()
alert('count: '+features.length);
This method returns an array containing all the features,so you can use length to count.
<!DOCTYPE html>
<html>
<head>
<title>heatlayer count example</title>
<link rel="stylesheet" href="https://openlayers.org/en/v3.20.1/css/ol.css" type="text/css">
<!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
<script src="https://openlayers.org/en/v3.20.1/build/ol.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.2.61/jspdf.min.js"></script>
<style>
.map {
max-width: 566px;
}
</style>
</head>
<body>
<div id="map" class="map"></div>
<script>
var raster = new ol.layer.Tile({
source: new ol.source.OSM()
});
var heatlayer = new ol.layer.Heatmap({
source: new ol.source.Vector(),
blur: parseInt(14),
radius: parseInt(8)
});
var adddata = [[104.807799,30.232233],[106.803599,31.233225]];
//addfeature
for(var i = 0;i < adddata.length ; i++){
var feature = new ol.Feature({
geometry:new ol.geom.Point([adddata[i][0],adddata[i][1]])
});
heatlayer.getSource().addFeature(feature);
}
var map = new ol.Map({
layers: [raster,heatlayer],
target: 'map',
controls: ol.control.defaults({
attributionOptions: /** #type {olx.control.AttributionOptions} */ ({
collapsible: false
})
}),
view: new ol.View({
projection: 'EPSG:4326',
center:[104.07, 30.7],
zoom: 2
})
});
map.on('click', function(event){
var features = heatlayer.getSource().getFeatures()
alert('count: '+features.length);
});
</script>
</body>
</html>

Rule based Styling in openlayers 3

I am trying to do the rule based styling in openlayers 3, here is my code:
<!DOCTYPE html>
<html>
<head>
<title>CONFIG</title>
<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="http://openlayers.org/en/v3.8.2/css/ol.css" type="text/css">
<script src="http://openlayers.org/en/v3.8.2/build/ol.js"></script>
</head>
<body>
<div class="container-fluid">
<div class="row-fluid">
<div class="span12">
<div id="map" class="map"></div>
</div>
</div>
<script>
var layerStyle = {
default: {
style: new ol.style.Style({
stroke: new ol.style.Stroke({
color: 'rgba(0, 0, 0, 1.0)',
width: 0.5
}),
fill: new ol.style.Fill({
color: 'rgba(0, 255, 0, 0.5)'
})
})
},
filter: [{
type: "AND",
rules: [{
type: "==",
property: "CODE",
value: "16"
}, {
type: "==",
property: "NAME",
value: "CHIKMAGALUR"
}],
symbolizers: {
style: new ol.style.Style({
stroke: new ol.style.Stroke({
color: 'rgba(0, 255, 0, 0.5)',
width: 0.5
}),
fill: new ol.style.Fill({
color: 'red'
})
})
}
} ]
};
var geojson_layer = new ol.layer.Vector({
source: new ol.source.Vector({
url: 'file.geojson',
format: new ol.format.GeoJSON()
}),
});
var vectorLayer = new ol.source.Vector({
features: (new ol.format.GeoJSON()).readFeatures(geojsonObject)
});
if ('CODE'=='16' && 'NAME'=='CHIKMAGALUR') {
style: symbolizers;
}
var map = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
}),
vectorLayer,
],
target: 'map',
controls: ol.control.defaults({
attributionOptions: /** #type {olx.control.AttributionOptions} */ ({
collapsible: false
})
}),
view: new ol.View({
center: [0, 0],
zoom: 5
})
});
</script>
</body>
</html>
I am trying trying to get the style from symbolizer, but I am getting error. Like openlayer2 I used the filters for AND operation but I stucked. Can someone help me on this??

In OL3 vector layers have a style attribute that can be a Style object, an array of Style objects or a function that returns a Style object or an array of Style objects. You probably want to use a style function for what you are trying to do.
See the following example for how this can be done:
http://openlayers.org/en/v3.20.1/examples/earthquake-clusters.html

Openlayers 3 WMTS

I am having an issue where I am trying to load a WMTS feed using Openlayers and seem not to be getting good results. For ArcGis services this seems to go through but not GeoServer's WMTS services. The code is as shown below. I keep getting a javascript error
TypeError: Argument 2 of CanvasRenderingContext2D.putImageData is not a finite floating-point value.
The code I am using is shown below. Regardless of changing the projection the error remains the same. Please advise. Raw Gist here
<!DOCTYPE html>
<html>
<head>
<title>WMTS example</title>
<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"> </script>
<link rel="stylesheet" href="http://openlayers.org/en/v3.8.2/css/ol.css" type="text/css">
<script src="http://openlayers.org/en/v3.8.2/build/ol.js"></script>
<meta content="text/html;charset=utf-8" http-equiv="Content-Type">
<meta content="utf-8" http-equiv="encoding">
</head>
<body>
<div class="container-fluid">
<div class="row-fluid">
<div class="span12">
<div id="map" class="map"></div>
</div>
</div>
</div>
<script>
var projection = ol.proj.get('EPSG:4326');
var projectionExtent = projection.getExtent();
var size = ol.extent.getWidth(projectionExtent) / 256;
var resolutions = new Array(21);
var matrixIds = new Array(21);
for (var i=0; i<21; ++i) {
matrixIds[i] = "EPSG:4326:" + i;
}
var attribution = new ol.Attribution({
html: 'Tiles © <a href="http://services.arcgisonline.com/arcgis/rest/' +
'services/Demographics/USA_Population_Density/MapServer/">ArcGIS</a>'
});
var map = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.OSM(),
opacity: 0.7
}),
new ol.layer.Tile({
opacity: 0.7,
source: new ol.source.WMTS({
attributions: [attribution],
url: 'http://suite.opengeo.org/geoserver/gwc/service/wmts',
layer: 'opengeo:countries',
matrixSet: 'ESPG:4326',
format: 'image/png',
style : 'default',
projection: projection,
tileGrid: new ol.tilegrid.WMTS({
origin: ol.extent.getTopLeft(projectionExtent),
resolutions: resolutions,
matrixIds: matrixIds
}),
wrapX: true
})
})
],
target: 'map',
controls: ol.control.defaults({
attributionOptions: /** #type {olx.control.AttributionOptions} */ ({
collapsible: false
})
}),
view: new ol.View({
center: [-13677832, 5213272],
//center: [-11158582, 4813697],
zoom: 1
})
});
</script>
</body>
</html>

Your resolutions array is just filled with undefineds, right? You should fill it with you desired resolutions.

You should to init your resolution array like this:
for (var z = 0; z < 21; ++z) {
resolutions[z] = size / Math.pow(2, z);
matrixIds[z] = "EPSG:4326:" + z;;
}
Did you set map's projection to ol.proj.get('EPSG:4326')?
var view = new ol.View({
center: [0, 0],
zoom: 1,
projection: ol.proj.get('EPSG:4326')
});

OpenLayers 3 WMS Layer - Misplaced tiles in EPSG:2180 projection

I'm trying to display map of Poland using OpenLayers 3. I need it to be in projection EPSG:2180. Ewerything is ok until I switch the projection.
This works fine:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://openlayers.org/en/v3.7.0/build/ol.js" type="text/javascript"></script>
<script src="proj4js/proj4-src.js" type="text/javascript"></script>
<script>
proj4.defs('EPSG:2180', "+proj=tmerc +lat_0=0 +lon_0=19 +k=0.9993 +x_0=500000 +y_0=-5300000 +ellps=GRS80 +units=m +no_defs");
function init()
{
var p = ol.proj.get('EPSG:3857');
var mapTiles = new ol.Map({
target: 'map',
renderer: 'canvas',
layers: [
new ol.layer.Tile({
source: new ol.source.TileWMS({
url: 'http://mapy.geoportal.gov.pl/wss/service/img/guest/ORTO/MapServer/WMSServer',
params: {
'LAYERS': 'Raster'
}
}),
isBaseLayer: true,
projection: p
})
],
view: new ol.View({
center: ol.proj.transform([19, 52], 'EPSG:4326', 'EPSG:3857'),
zoom: 6,
projection: p
})
});
}
</script>
</head>
<body onload="init()">
<div id="map"></div>
</body>
</html>
When i switch projection to EPSG:2180 tiles are misplaced.
Code with EPSG:2180
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>test</title>
<script src="http://openlayers.org/en/v3.7.0/build/ol.js" type="text/javascript"></script>
<script src="proj4js/proj4-src.js" type="text/javascript"></script>
<script>
proj4.defs('EPSG:2180', "+proj=tmerc +lat_0=0 +lon_0=19 +k=0.9993 +x_0=500000 +y_0=-5300000 +ellps=GRS80 +units=m +no_defs");
function init()
{
var p = ol.proj.get('EPSG:2180');
var mapTiles = new ol.Map({
target: 'map',
renderer: 'canvas',
layers: [
new ol.layer.Tile({
source: new ol.source.TileWMS({
url: 'http://mapy.geoportal.gov.pl/wss/service/img/guest/ORTO/MapServer/WMSServer',
params: {
'LAYERS': 'Raster',
'CRS': 'EPSG:2180'
}
}),
isBaseLayer: true,
projection: p
})
],
view: new ol.View({
center: ol.proj.transform([19, 52], 'EPSG:4326', 'EPSG:2180'),
zoom: 6,
projection: p
})
});
}
</script>
</head>
<body onload="init()">
<div id="map"></div>
</body>
</html>
Any idea what is the problem?
https://jsfiddle.net/b2L6qppd/

I have add one element - it prevent of axes problem.
params: {
'LAYERS': 'Raster',
'CRS': 'EPSG:2180',
'VERSION': '1.1.1'
}
try with this: jsfiddle.net/b2L6qppd/2/

openlayer geometric points won't show

I am new to openlayers and a beginner to javascript, but I have tried for 3 days and nights now. My code seems okay but there is something I am missing out and just can’t figure it out
I have this problem, I can’t find my geometric points on my map.
My code goes thus:
//html
<!doctype html>
<head>
<title> Me OpenStreetMap </title>
<link rel="stylesheet" href="../assets/ol3/css/ol.css" type="text/css" />
<link rel="stylesheet" href="../assets/ol3/css/samples.css" type="text/css" />
</head>
<body>
<div id="map"></div>
<script src="../assets/ol3/js/ol.js"></script>
<script>
// style for geometric layer
var meStyle = new ol.style.Circle({
radius: 20,
fill: new ol.style.Fill({
color: '#ff9900',
opacity: 1
}),
stroke: new ol.style.Stroke({
color: '#ffcc00',
opacity: 1
})
});
// geometric layer
var geoLayer = new ol.layer.Vector({
source : new ol.source.Vector({
projection : 'EPSG:3857',
url : '../data/json.json',
format: new ol.format.GeoJSON(),
style: meStyle
})
});
// create layer
var osmLayer = new ol.layer.Tile({
source : new ol.source.OSM()
});
// create view
var yaounde = new ol.proj.transform([11.5653, 3.86617],
'EPSG:4326', 'EPSG:3857'
);
var view = new ol.View({
center: yaounde,
zoom: 15
});
// create map
var map = new ol.Map({
target: 'map'
});
map.addLayer(osmLayer, geoLayer);
map.setView(view);
</script>
</body>
</html>
//geojson
{"type":"FeatureCollection",
"features":
[
{"type":"Feature","properties":{"Name":"","Description":""},"geometry":{"type":"Point","coordinates":[0.0,0.0]}},
{"type":"Feature","properties":{"Name":"1","Description":""},"geometry":{"type":"Point","coordinates":[11.50728,3.87471,0.0]}},
{"type":"Feature","properties":{"Name":"2","Description":""},"geometry":{"type":"Point","coordinates":[11.5072,3.8759,0.0]}},
{"type":"Feature","properties":{"Name":"3","Description":""},"geometry":{"type":"Point","coordinates":[11.5032,3.87556,0.0]}},
{"type":"Feature","properties":{"Name":"4","Description":""},"geometry":{"type":"Point","coordinates":[11.50291,3.87552,0.0]}},
{"type":"Feature","properties":{"Name":"5","Description":""},"geometry":{"type":"Point","coordinates":[11.50278,3.87573,0.0]}},
{"type":"Feature","properties":{"Name":"6","Description":""},"geometry":{"type":"Point","coordinates":[11.50316,3.87621,0.0]}},
{"type":"Feature","properties":{"Name":"7","Description":""},"geometry":{"type":"Point","coordinates":[11.50347,3.87611,0.0]}},
{"type":"Feature","properties":{"Name":"8","Description":""},"geometry":{"type":"Point","coordinates":[11.50314,3.8763,0.0]}},
{"type":"Feature","properties":{"Name":"9","Description":""},"geometry":{"type":"Point","coordinates":[11.50325,3.87652,0.0]}},
{"type":"Feature","properties":{"Name":"10","Description":""},"geometry":{"type":"Point","coordinates":[11.50356,3.87558,0.0]}},
{"type":"Feature","properties":{"Name":"11","Description":""},"geometry":{"type":"Point","coordinates":[11.5033,3.87564,0.0]}},
{"type":"Feature","properties":{"Name":"12","Description":""},"geometry":{"type":"Point","coordinates":[11.50397,3.87586,0.0]}},
{"type":"Feature","properties":{"Name":"13","Description":""},"geometry":{"type":"Point","coordinates":[11.50299,3.87641,0.0]}},
{"type":"Feature","properties":{"Name":"14","Description":""},"geometry":{"type":"Point","coordinates":[11.50279,3.8771,0.0]}},
{"type":"Feature","properties":{"Name":"15","Description":""},"geometry":{"type":"Point","coordinates":[11.50269,3.87723,0.0]}},
{"type":"Feature","properties":{"Name":"16","Description":""},"geometry":{"type":"Point","coordinates":[11.50258,3.87722,0.0]}},
{"type":"Feature","properties":{"Name":"17","Description":""},"geometry":{"type":"Point","coordinates":[11.49122,3.8738,0.0]}},
{"type":"Feature","properties":{"Name":"18","Description":""},"geometry":{"type":"Point","coordinates":[11.48567,3.87447,0.0]}},
{"type":"Feature","properties":{"Name":"19","Description":""},"geometry":{"type":"Point","coordinates":[11.48548,3.88107,0.0]}},
{"type":"Feature","properties":{"Name":"20","Description":""},"geometry":{"type":"Point","coordinates":[11.48526,3.8812,0.0]}},
{"type":"Feature","properties":{"Name":"21","Description":""},"geometry":{"type":"Point","coordinates":[11.48614,3.88044,0.0]}},
{"type":"Feature","properties":{"Name":"22","Description":""},"geometry":{"type":"Point","coordinates":[11.48638,3.88033,0.0]}},
{"type":"Feature","properties":{"Name":"23","Description":""},"geometry":{"type":"Point","coordinates":[11.48641,3.88053,0.0]}},
{"type":"Feature","properties":{"Name":"24","Description":""},"geometry":{"type":"Point","coordinates":[11.4868,3.88029,0.0]}},
{"type":"Feature","properties":{"Name":"25","Description":""},"geometry":{"type":"Point","coordinates":[11.48772,3.87994,0.0]}},
{"type":"Feature","properties":{"Name":"26","Description":""},"geometry":{"type":"Point","coordinates":[11.4887,3.88057,0.0]}},
{"type":"Feature","properties":{"Name":"27","Description":""},"geometry":{"type":"Point","coordinates":[11.48869,3.88057,0.0]}},
{"type":"Feature","properties":{"Name":"28","Description":""},"geometry":{"type":"Point","coordinates":[11.48868,3.8807,0.0]}},
{"type":"Feature","properties":{"Name":"29","Description":""},"geometry":{"type":"Point","coordinates":[11.4888,3.88071,0.0]}},
{"type":"Feature","properties":{"Name":"30","Description":""},"geometry":{"type":"Point","coordinates":[11.49206,3.8775,0.0]}},
{"type":"Feature","properties":{"Name":"31","Description":""},"geometry":{"type":"Point","coordinates":[11.49251,3.87748,0.0]}},
{"type":"Feature","properties":{"Name":"32","Description":""},"geometry":{"type":"Point","coordinates":[11.4923,3.87783,0.0]}},
{"type":"Feature","properties":{"Name":"33","Description":""},"geometry":{"type":"Point","coordinates":[11.49273,3.87822,0.0]}}
]
}
The OpenStreet map appears by I can’t find the points

It is very simple to solve:
map.addLayer(osmLayer);
map.addLayer(geoLayer);
The addLayer method accepts a layer, only one. A working demo with your code.

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