WFS Layer Not Display - openlayers-3

I created WFS GeoJson layer from GeoServer ,I got this url'http://localhost:8080/geoserver/trail/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=trail:sbi_branch_data&maxFeatures=50&outputFormat=application%2Fjson' ,I got example from OL3 examples From that code ,I tried some code in OpenLayer3 ,but giving some error.please help me .Thanks.
<!DOCTYPE html>
<html>
<head>
<title>WFS</title>
<!-- <link rel="stylesheet" href="https://openlayers.org/en/v4.1.0/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/v4.1.0/build/ol.js"></script>-->
<link rel="stylesheet" href="css/ol.css" type="text/css" />
<link rel="stylesheet" href="css/sample.css" type="text/css" />
</head>
<body>
<div id="map" class="map"></div>
<script src="js/ol.js"></script>
<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
<script>
var vectorSource = new ol.source.Vector({
format: new ol.format.GeoJSON(),
url: function(extent) {
return 'http://localhost:8080/geoserver/trail/ows?service=WFS&'+
'version=1.0.0&request=GetFeature&typeName=trail:sbi_branch_data&'+
'maxFeatures=50&outputFormat=application/json&srsname=EPSG:4326&' +
'bbox=' + extent.join(',') + ',EPSG:4326';
},
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 raster = new ol.layer.Tile({
// source: new ol.source.BingMaps({
// imagerySet: 'Aerial',
// key: 'Your Bing Maps Key from http://www.bingmapsportal.com/ here'
// })
});
var map = new ol.Map({
layers: [raster, vector],
target: document.getElementById('map'),
view: new ol.View({
center: [20.5937, 78.9629],
maxZoom: 19,
zoom: 12
})
});
</script>
</body>
</html>
Error:
"XMLHttpRequest cannot load http://localhost:8080/geoserver/trail/ows?service=WFS&version=1.0.0&request…644126996,-13297.517049905844,22569.517044127,13455.442849905845,EPSG:4326. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access."


I got the solution,First I installed the Apache then modify the httpd.config file.I just put
ProxyRequests Off
ProxyPreserveHost On
<Proxy /geoserver>
Require all granted
</Proxy>
ProxyPass /geoserver http://localhost:8080/geoserver
ProxyPassReverse /geoserver http://localhost:8080/geoserver
ProxyPass /geoserver http://localhost:8080/geoserver
ProxyPassReverse /geoserver http://localhost:8080/geoserver
this code in httpd.config at the end of file.
and then enabled this from httpd.config
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
LoadModule proxy_http_module modules/mod_proxy_http.so
Then all my html files i stored in ht-docs in Apache ,then runs all the wfs files.

Related

Add a WFS layer into an OpenLayers map

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?

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>

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')
});

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.

include a json file in a rails view path?

I am new to rails.
I am trying to add this code:
$.ajax({
url: "states.geojson",
dataType: 'json',
success: function load(d) {
var states = L.geoJson(d).addTo(map);
L.marker([38, -102], {
icon: L.mapbox.marker.icon({
'marker-color': '#f22'
}),
draggable: true
}).addTo(map)
.on('dragend', function(e) {
var layer = leafletPip.pointInLayer(this.getLatLng(), states, true);
document.getElementById('state').innerHTML = layer.length ?
layer[0].feature.properties.name : '';
});
}
});
which I got from here: http://www.mapbox.com/mapbox.js/example/v1.0.0/point-in-polygon/
this is my index.html.erb :
<!DOCTYPE html>
<html>
<head>
<meta name='viewport' content='width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no' />
<script src='//api.tiles.mapbox.com/mapbox.js/v1.3.1/mapbox.js'></script>
<link href='//api.tiles.mapbox.com/mapbox.js/v1.3.1/mapbox.css' rel='stylesheet' />
<!--[if lte IE 8]>
<link href='//api.tiles.mapbox.com/mapbox.js/v1.3.1/mapbox.ie.css' rel='stylesheet' >
<![endif]-->
<style>
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
<style>
#state {
position:absolute;
top:10px;
right:10px;
background:#fff;
font-size:30px;
padding:10px;
z-index:999;
}
</style>
<!-- <script src="leaflet-pip.min.js"></script> -->
<div id='map'></div>
<div id='state'></div>
<script type='text/javascript'>
var map = L.mapbox.map('map', 'lizozomro.map-6yvs8g1g')
.setView([38, -102.0], 5);
$.ajax({
url: "states.geojson",
dataType: 'json',
success: function load(d) {
var states = L.geoJson(d).addTo(map);
L.marker([38, -102], {
icon: L.mapbox.marker.icon({
'marker-color': '#f22'
}),
draggable: true
}).addTo(map)
.on('dragend', function(e) {
var layer = leafletPip.pointInLayer(this.getLatLng(), states, true);
document.getElementById('state').innerHTML = layer.length ?
layer[0].feature.properties.name : '';
});
}
});
</script>
</body>
</html>
I am getting a resource not found error (404) on states.geojson
I am not sure where exactly I should place it or how to reference using the correct paths.
Right now I have a copy of the file in my root app folder, one in my view folder(called maps), right next to the index.html.erb
How can I reference the resource correctly?

put it in the my_project/public/ folder. You also want to rename the file to states.geojson.json

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