[OpenLayers-Users] geojson google maps zoom levels

Mon Sep 28 06:54:27 EDT 2009

i have a big problem
i'm managing to overlay a geojson layer to google maps
i did it succesfully
my problem is that when i zoom in too much my geojson level disapperar
i cannot get the problem
can someone help me?

this is the code
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="DefaultOL.aspx.cs" Inherits="DefaultOL" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

<title></title>

<script src="OpenLayers-2.8/OpenLayers.js" type="text/javascript"></script>

<script src="http://ecn.dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=6.2&mkt=it-it"></script> 

<%--localhost google map key--%>

<script src='http://maps.google.com/maps?file=api&amp;v=2&amp;key=ABQIAAAAjpkAC9ePGem0lIq5XcMiuhT2yXp_ZAY8_ufC3CFXhHIE1NvwkxTS6gjckBmeABOGXIUiOiZObZESPg'></script>

</head>

<body>

<form id="form1" runat="server">

<asp:ScriptManager ID="ScriptManager1" runat="server">

<Services>

<asp:ServiceReference Path="~/MapService.asmx" />

</Services>

</asp:ScriptManager>

<input type="button" onclick="getShape_onclick()" value="Overlay selected Shapefile" />

mappa:

<div id="map" style="width: 800px; height: 500px"></div>

<script type="text/javascript">

var map = null; 

function pageLoad() {

var options = {

projection: new OpenLayers.Projection("EPSG:900913"),

displayProjection: new OpenLayers.Projection("EPSG:4326"),

units: "m",

maxResolution: 156543.0339,

maxExtent: new OpenLayers.Bounds(-20037508.34, -20037508.34,

20037508.34, 20037508.34)

//,numZoomLevels: 20

};

map = new OpenLayers.Map('map',options);

var shaded = new OpenLayers.Layer.VirtualEarth("VE Shaded", { "sphericalMercator": true, type: VEMapStyle.Shaded });

var hybrid = new OpenLayers.Layer.VirtualEarth("VE Hybrid", { "sphericalMercator": true, type: VEMapStyle.Hybrid });

var aerial = new OpenLayers.Layer.VirtualEarth("VE Aerial", { "sphericalMercator": true, type: VEMapStyle.Aerial });

var google = new OpenLayers.Layer.Google("Google Hybrid", { "sphericalMercator": true, type: G_HYBRID_MAP});

map.addLayers([shaded, hybrid, aerial, google]);

map.addControl(new OpenLayers.Control.LayerSwitcher());

map.addControl(new OpenLayers.Control.MousePosition());

map.setCenter(new OpenLayers.LonLat(1472482, 5794538), 5);

}

function getShape_onclick() {

MapService.GetMapData('GBR1.shp', GetESRIData_success, onFailed);

}

function onFailed(e) {

MessageBox(true, "Error while connecting to the remote web service. Please try again later.", 5000);

}

function GetESRIData_success(e) {

//replace with call to webservice

//var featurecollection = e;

var featurecollection = {

"type": "FeatureCollection",

"features": [

{ "geometry": {

"type": "GeometryCollection",

"geometries": [

{

"type": "LineString",

"coordinates":

[[13.2, 46.1],

[13, 46]]

},

{

"type": "Polygon",

"coordinates":

[[[11.0878902207, 45.1602390564],

[14.931640625, 40.9228515625],

[0.8251953125, 41.0986328125],

[7.63671875, 48.96484375],

[11.0878902207, 45.1602390564]]]

},

{

"type": "Point",

"coordinates": [13.2, 46.1]

}

]

},

"type": "Feature",

"properties": {}

}

]

};

var geojson_format = new OpenLayers.Format.GeoJSON({

'internalProjection': new OpenLayers.Projection("EPSG:900913"),

'externalProjection': new OpenLayers.Projection("EPSG:4326")

});

var vector_layer = new OpenLayers.Layer.Vector("shape");

//var vector_layer = new OpenLayers.Layer.Vector("shape", { projection: map.displayProjection });

map.addLayer(vector_layer);

vector_layer.addFeatures(geojson_format.read(featurecollection));

}

//]]>

</script> 

</form>

</body>

</html>

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