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<!DOCTYPE html>
<html>
<head>
<title>OpenLayers ArcGIS Cache Example (MapServer Access)</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link rel="stylesheet" href="../theme/default/style.css" type="text/css">
<link rel="stylesheet" href="style.css" type="text/css">
<script src='http://maps.google.com/maps?file=api&v=2&key=ABQIAAAAjpkAC9ePGem0lIq5XcMiuhR_wWLPFku8Ix9i2SXYRVK3e45q1BQUd_beF8dtzKET_EteAjPdGDwqpQ'></script>
<script src="../lib/OpenLayers.js"></script>
<script src="../lib/OpenLayers/Layer/ArcGISCache.js" type="text/javascript"></script>
<script type="text/javascript">
var map,
cacheLayer,
testLayer,
//This layer requires meta data about the ArcGIS service. Typically you should use a
//JSONP call to get this dynamically. For this example, we are just going to hard-code
//an example that we got from here (yes, it's very big):
// http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer?f=json&pretty=true
layerInfo = {
"currentVersion" : 10.01,
"serviceDescription" : "This worldwide street map presents highway-level data for the world and street-level data for the United States, Canada, Japan, Southern Africa, and a number of countries in Europe and elsewhere. This comprehensive street map includes highways, major roads, minor roads, railways, water features, administrative boundaries, cities, parks, and landmarks, overlaid on shaded relief imagery for added context. The street map was developed by ESRI using ESRI basemap data, AND road data, USGS elevation data, and UNEP-WCMC parks and protected areas for the world, and Tele Atlas Dynamap® and Multinet® street data for North America and Europe. Coverage for street-level data in Europe includes Andorra, Austria, Belgium, Czech Republic, Denmark, France, Germany, Great Britain, Greece, Hungary, Ireland, Italy, Luxembourg, Netherlands, Northern Ireland (Belfast only), Norway, Poland, Portugal, San Marino, Slovakia, Spain, Sweden, and Switzerland. Coverage for street-level data elsewhere in the world includes China (Hong Kong only), Colombia, Egypt (Cairo only), Indonesia (Jakarta only), Japan, Mexico (Mexico City only), Russia (Moscow and St. Petersburg only), South Africa, Thailand, and Turkey (Istanbul and Ankara only). For more information on this map, visit us \u003ca href=\"http://goto.arcgisonline.com/maps/World_Street_Map \" target=\"_new\"\u003eonline\u003c/a\u003e.",
"mapName" : "Layers",
"description" : "This worldwide street map presents highway-level data for the world and street-level data for the United States, Canada, Japan, Southern Africa, most countries in Europe, and several other countries. This comprehensive street map includes highways, major roads, minor roads, one-way arrow indicators, railways, water features, administrative boundaries, cities, parks, and landmarks, overlaid on shaded relief imagery for added context. The map also includes building footprints for selected areas in the United States and Europe and parcel boundaries for much of the lower 48 states.\n\nThe street map was developed by ESRI using ESRI basemap data, DeLorme base map layers, AND road data, USGS elevation data, UNEP-WCMC parks and protected areas for the world, Tele Atlas Dynamap® and Multinet® street data for North America and Europe, and First American parcel data for the United States. Coverage for street-level data in Europe includes Andorra, Austria, Belgium, Czech Republic, Denmark, France, Germany, Great Britain, Greece, Hungary, Ireland, Italy, Luxembourg, Netherlands, Norway, Poland, Portugal, San Marino, Slovakia, Spain, Sweden, and Switzerland. Coverage for street-level data elsewhere in the world includes China (Hong Kong only), Colombia, Egypt (Cairo only), Indonesia (Jakarta only), Japan, Mexico, Russia, South Africa, Thailand, and Turkey (Istanbul and Ankara only). For more information on this map, visit us online at http://goto.arcgisonline.com/maps/World_Street_Map\n",
"copyrightText" : "Sources: ESRI, DeLorme, AND, Tele Atlas, First American, ESRI Japan, UNEP-WCMC, USGS, METI, ESRI Hong Kong, ESRI Thailand, Procalculo Prosis",
"layers" : [
{
"id" : 0,
"name" : "World Street Map",
"parentLayerId" : -1,
"defaultVisibility" : true,
"subLayerIds" : null,
"minScale" : 0,
"maxScale" : 0
}
],
"tables" : [
],
"spatialReference" : {
"wkid" : 102100
},
"singleFusedMapCache" : true,
"tileInfo" : {
"rows" : 256,
"cols" : 256,
"dpi" : 96,
"format" : "JPEG",
"compressionQuality" : 90,
"origin" : {
"x" : -20037508.342787,
"y" : 20037508.342787
},
"spatialReference" : {
"wkid" : 102100
},
"lods" : [
{"level" : 0, "resolution" : 156543.033928, "scale" : 591657527.591555},
{"level" : 1, "resolution" : 78271.5169639999, "scale" : 295828763.795777},
{"level" : 2, "resolution" : 39135.7584820001, "scale" : 147914381.897889},
{"level" : 3, "resolution" : 19567.8792409999, "scale" : 73957190.948944},
{"level" : 4, "resolution" : 9783.93962049996, "scale" : 36978595.474472},
{"level" : 5, "resolution" : 4891.96981024998, "scale" : 18489297.737236},
{"level" : 6, "resolution" : 2445.98490512499, "scale" : 9244648.868618},
{"level" : 7, "resolution" : 1222.99245256249, "scale" : 4622324.434309},
{"level" : 8, "resolution" : 611.49622628138, "scale" : 2311162.217155},
{"level" : 9, "resolution" : 305.748113140558, "scale" : 1155581.108577},
{"level" : 10, "resolution" : 152.874056570411, "scale" : 577790.554289},
{"level" : 11, "resolution" : 76.4370282850732, "scale" : 288895.277144},
{"level" : 12, "resolution" : 38.2185141425366, "scale" : 144447.638572},
{"level" : 13, "resolution" : 19.1092570712683, "scale" : 72223.819286},
{"level" : 14, "resolution" : 9.55462853563415, "scale" : 36111.909643},
{"level" : 15, "resolution" : 4.77731426794937, "scale" : 18055.954822},
{"level" : 16, "resolution" : 2.38865713397468, "scale" : 9027.977411},
{"level" : 17, "resolution" : 1.19432856685505, "scale" : 4513.988705}
]
},
"initialExtent" : {
"xmin" : -20037507.0671618,
"ymin" : -20037507.0671618,
"xmax" : 20037507.0671618,
"ymax" : 20037507.0671619,
"spatialReference" : {
"wkid" : 102100
}
},
"fullExtent" : {
"xmin" : -20037507.0671618,
"ymin" : -19971868.8804086,
"xmax" : 20037507.0671618,
"ymax" : 19971868.8804086,
"spatialReference" : {
"wkid" : 102100
}
},
"units" : "esriMeters",
"supportedImageFormatTypes" : "PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,AI,BMP",
"documentInfo" : {
"Title" : "World Street Map",
"Author" : "ESRI",
"Comments" : "",
"Subject" : "streets, highways, major roads, railways, water features, administrative boundaries, cities, parks, protected areas, landmarks ",
"Category" : "transportation(Transportation Networks) ",
"Keywords" : "World, Global, 2009, Japan, UNEP-WCMC",
"Credits" : ""
},
"capabilities" : "Map"
};
function init(){
//The max extent for spherical mercator
var maxExtent = new OpenLayers.Bounds(-20037508.34,-20037508.34,20037508.34,20037508.34);
//Max extent from layerInfo above
var layerMaxExtent = new OpenLayers.Bounds(
layerInfo.fullExtent.xmin,
layerInfo.fullExtent.ymin,
layerInfo.fullExtent.xmax,
layerInfo.fullExtent.ymax
);
var resolutions = [];
for (var i=0; i<layerInfo.tileInfo.lods.length; i++) {
resolutions.push(layerInfo.tileInfo.lods[i].resolution);
}
map = new OpenLayers.Map('map', {
maxExtent: maxExtent,
StartBounds: layerMaxExtent,
units: (layerInfo.units == "esriFeet") ? 'ft' : 'm',
resolutions: resolutions,
tileSize: new OpenLayers.Size(layerInfo.tileInfo.width, layerInfo.tileInfo.height),
projection: 'EPSG:' + layerInfo.spatialReference.wkid
});
cacheLayer = new OpenLayers.Layer.ArcGISCache( "AGSCache",
"http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer", {
isBaseLayer: true,
//From layerInfo above
resolutions: resolutions,
tileSize: new OpenLayers.Size(layerInfo.tileInfo.cols, layerInfo.tileInfo.rows),
tileOrigin: new OpenLayers.LonLat(layerInfo.tileInfo.origin.x , layerInfo.tileInfo.origin.y),
maxExtent: layerMaxExtent,
projection: 'EPSG:' + layerInfo.spatialReference.wkid
});
// create Google Mercator layers
testLayer = new OpenLayers.Layer.Google(
"Google Streets",
{'sphericalMercator': true}
);
map.addLayers([testLayer, cacheLayer]);
map.addControl(new OpenLayers.Control.LayerSwitcher());
map.addControl( new OpenLayers.Control.MousePosition() );
map.zoomToExtent(new OpenLayers.Bounds(-8341644, 4711236, -8339198, 4712459));
}
</script>
</head>
<body onload="init()">
<h1 id="title">OpenLayers ArcGIS Cache Example (MapServer Access)</h1>
<div id="tags">
arcgis, arcgiscache, cache, tms
</div>
<p id="shortdesc">
Demonstrates the basic initialization of the ArcGIS Cache layer using a prebuilt configuration, and standard tile access.
</p>
<div id="map" class="smallmap"></div>
<div id="docs">
<p>This example demonstrates using the ArcGISCache layer for
accessing ESRI's ArcGIS Server (AGS) Map Cache tiles through
an AGS MapServer. Toggle the visibility of the AGS layer to
demonstrate how the two maps are lined up correctly.</p>
<h2>Notes on this layer</h2>
<p>A few attempts have been made at this kind of layer before. See
<a href="http://trac.osgeo.org/openlayers/ticket/1967">here</a> and
<a href="http://trac.osgeo.org/openlayers/browser/sandbox/tschaub/arcgiscache/lib/OpenLayers/Layer/ArcGISCache.js">here</a>.
A problem the users encounter is that the tiles seem to "jump around".
This is due to the fact that the max extent for the cached layer actually
changes at each zoom level due to the way these caches are constructed.
We have attempted to use the resolutions, tile size, and tile origin
from the cache meta data to make the appropriate changes to the max extent
of the tile to compensate for this behavior.</p>
You will need to know:
<ul>
<li>Max Extent: The max extent of the layer</li>
<li>Resolutions: An array of resolutions, one for each zoom level</li>
<li>Tile Origin: The location of the tile origin for the cache in the upper left.</li>
<li>Tile Size: The size of each tile in the cache. Commonly 256 x 256</li>
</ul>
<p>It's important that you set the correct values in your layer, and these
values will differ from layer to layer. You can find these values for your
layer in a metadata page in ArcGIS Server.
(ie. <a href="http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer">http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer</a>)</p>
<ul>
<li>Max Extent: Full Extent</li>
<li>Resolutions: Tile Info -> Levels of Detail -> Resolution</li>
<li>Tile Origin: Origin -> X,Y</li>
<li>Tile Size: Tile Info -> Height,Width</li>
</ul>
<h2> Other Examples </h2>
<p>This is one of three examples for this layer. You can also configure this
layer to use <a href="arcgiscache_direct.html">prebuilt tiles in a file store
(not a live server).</a> It is also possible to let this
<a href="arcgiscache_jsonp.html">layer 'auto-configure' itself using the
capabilities json object from the server itself when using a live ArcGIS server.</a>
</p>
</div>
</body>
</html>
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