OpenLayers3で使える Projection

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Go to /OL3Exam/20_Projection.html

https://github.com/kagyuu/OL3Exam/blob/master/20_Projection.html

<!doctype html>
<html lang="jp">
<head>
	<title>OpenLayers 3 example 20 Projection</title>
	<meta charset="UTF-8">
	<link rel="stylesheet" href="css/ol.css" type="text/css"/>
	<link rel="stylesheet" href="css/sample.css" type="text/css"/>
	<style>
	body {
		padding : 0;
		margin : 0;
	}
	table {
		width:80%;
		border-collapse: separate;
		border-spacing: 0px;
		border-top: 1px solid #ccc;
		border-left: 1px solid #ccc;
	}
	th{
		padding: 4px;
		text-align: left;
		vertical-align: top;
		color: #444;
		background-color: #ccc;
		border-top: 1px solid #fff;
		border-left: 1px solid #fff;
		border-right: 1px solid #ccc;
		border-bottom: 1px solid #ccc;
	}
	td{
		padding: 4px;
		background-color: #fafafa;
		border-right: 1px solid #ccc;
		border-bottom: 1px solid #ccc;
	}
	</style>
</head>
<body>
	<select>
		<option value="EPSG:4326" selected="selcted">EPSG 4326 (WGS 84 -- WGS84 - World Geodetic System 1984 正距円筒図法, used in GPS)</option>
		<option value="EPSG:3857">EPSG 3857 (WGS 84 / Pseudo-Mercator -- Spherical Mercator 正角円筒図法, Google Maps, OpenStreetMap, Bing, ArcGIS, ESRI)</option>
		<option value="EPSG:4087">EPSG:4087 (WGS 84 / World Equidistant Cylindrical 正積円筒図法)</option>
		<option value="ESRI:54009">ESRI:54009 (World Mollweide 正積擬円筒図法)</option>
		<option value="ESRI:54032">ESRI:54032 (World Azimuthal Equidistant 正距方位図法)</option>
	<select>
	<button onclick="javascript:location.reload()">refresh</button>
    <div id="map" class="map"></div>
    <table>
		<tr><th>Code</th><th>Extent</th><th>Meters Per Unit</th><th>Unit</th><th>is Global?</th></tr>
		<tr>
			<td><span id="code"></span></td>
			<td><span id="extent"></span></td>
			<td><span id="meter"></span></td>
			<td><span id="unit"></span></td>
			<td><span id="isGlobal"></span></td>
		</tr>
	</table>
<script src="js/jquery-2.1.4.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/proj4js/2.3.10/proj4.js"></script>
<script src="http://epsg.io/3410.js"></script>
<script src="http://epsg.io/4087.js"></script>
<script src="http://epsg.io/54009.js"></script>
<script src="http://epsg.io/54032.js"></script>
<script src="js/ol-debug.js"></script>
<script type="text/javascript">
var wgs84Sphere = new ol.Sphere(6378137);

// --(1) Create World Map
function createWorldMapLayer() {
	var worldMapSource = new ol.source.Vector({
		format: new ol.format.GeoJSON(),
		url: 'js/countries.geojson'
	});
	
	var worldMapStyle = new ol.style.Style({
		stroke: new ol.style.Stroke({
			color: 'lightgreen',
			width: 2
		}),
		fill : new ol.style.Fill({
			color: 'rgba(250, 255, 250, 1)'
		}),
	});
	
	var worldMapLayer = new ol.layer.Vector({
		source: worldMapSource,
		style: worldMapStyle
	});
	
	return worldMapLayer;	
}

// --(2) Create Circles (Tissot's indicatrix)
function createCircles(projection) {
	var featureArray = new ol.Collection();
	for (var lat = -60; lat < 90; lat +=30) {
		for (var lng = -180; lng < 180; lng += 30) {
			var geom = ol.geom.Polygon.circular(wgs84Sphere, [lng, lat], 800000, 32);
			geom.transform('EPSG:4326', projection);
			featureArray.push(new ol.Feature(geom));	
		}
	}
	
	var circleLayer = new ol.layer.Vector({
	  source : new ol.source.Vector({
		features: featureArray
	  })
	});
	
	return circleLayer;
}

// --(3) Projection Info
function showProjectionInfo(proj) {
	$('#code').text(proj.getCode());
	var extentAry = proj.getExtent();
	if (extentAry) {
		$('#extent').text("(" + extentAry[0] + "," + extentAry[1] + ") - (" + extentAry[2] + "," + extentAry[3] + ")");
	} else {
		$('#extent').text('');
	}
	$('#meter').text(proj.getMetersPerUnit());
	$('#unit').text(proj.getUnits());
	$('#isGlobal').text(proj.isGlobal() ? 'Global' : 'Local');
}

// --(4) Create Map
var map = new ol.Map({
	target: 'map',
	layers: [createWorldMapLayer(), createCircles('EPSG:4326')],
	view: new ol.View({
	  projection : 'EPSG:4326',
	  center: [0,0],
	  zoom: 2
	})
});
showProjectionInfo(map.getView().getProjection());

// -- (5) Create the graticule component
var graticule = new ol.Graticule({
  maxLines: 6,
  strokeStyle: new ol.style.Stroke({
    color: 'lightblue',
    width: 2,
    lineDash: [0.5, 4]
  })
});
graticule.setMap(map);

// -- (6) Projection Change
$('select').on('change', function(e) {
	var projection = $(this).val();
	
	for (var cnt = 0; cnt < 100 && map.getLayers().getLength() > 0; cnt++) {
		map.getLayers().forEach(function(elem, idx, ary){
			map.removeLayer(elem);
		});
	}
	
	var center = ol.proj.transform(map.getView().getCenter(), map.getView().getProjection(), projection);
	var zoom = map.getView().getZoom();
	
	map.setView(new ol.View({
	  projection : projection,
	  center: center,
	  zoom: zoom
	}));

	showProjectionInfo(map.getView().getProjection());
	map.addLayer(createWorldMapLayer());
	map.addLayer(createCircles(projection));	
});
</script>
</body>
</html>


GIS


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Last-modified: 2015-09-27 (日) 02:06:55 (433d)
ISBN10
ISBN13
9784061426061