Hi Matt
I suggest you use firefox and the firebug extension to develop with. I loaded
your js and firebug immediately showed me you had unterminated string literals
in your extent definition
var extent = new OpenLayers.Bounds(-7.423, 50.102,
-0.383, 60.988).transform(
new OpenLayers.Projection("EPSG:4326),
new OpenLayers.Projection("EPSG:900913)
);
I should be
var extent = new OpenLayers.Bounds(-7.423, 50.102,
-0.383, 60.988).transform(
new OpenLayers.Projection("EPSG:4326"),
new OpenLayers.Projection("EPSG:900913")
);
I get a map fixing these. Try this, and if your WMS layer doesn't show, check
the firebug Net tab and see what the response to your request was and you
should be able to troubleshoot from there.
hth,
charles
----- Original Message -----
From: "Matt Travis" <[email protected]>
To: "Charles Galpin" <[email protected]>
Cc: [email protected]
Sent: Sunday, December 5, 2010 6:16:38 AM GMT -05:00 US/Canada Eastern
Subject: Re: [OpenLayers-Users] Transform Bounds to EPSG:4326 projection
Thanks for advice Charles. I tried what you suggested but get a blank map
still. I moved the extent declaration above the options but do they need to be
inside the function or outside?
For the record I have tried both methods. As you can probably tell I'm a new to
javascript.
Thanks
Matt
var map;
// Avoid pink error tiles
OpenLayers.IMAGE_RELOAD_ATTEMPTS = 3;
OpenLayers.Util.onImageLoadErrorColor = "transparent";
var extent = new OpenLayers.Bounds(-7.423, 50.102,
-0.383, 60.988).transform(
new OpenLayers.Projection("EPSG:4326),
new OpenLayers.Projection("EPSG:900913)
);
function init(){
// Map is in mercator this time, so over-ride the default
// options that assume lat/lon.
var options = {
projection: new OpenLayers.Projection("EPSG:900913"),
displayProjection: new OpenLayers.Projection("EPSG:4326"),
units: "m",
numZoomLevels: 20,
maxResolution: 156543.0339,
maxExtent: extent
};
// Create the map object
map = new OpenLayers.Map('map', options);
// create Google Maps layer
var gmap = new OpenLayers.Layer.Google(
"Google Streets", // the default
{'sphericalMercator': true, numZoomLevels: 20}
);
// create Google Satellite layer
var gsat = new OpenLayers.Layer.Google(
"Google Satellite",
{type: G_SATELLITE_MAP, 'sphericalMercator': true, numZoomLevels: 20}
);
// create WMS Atrina layer
var wmslayer = new OpenLayers.Layer.WMS(
"Atrina",
" http://localhost:8080/geoserver/wms ",
{'layers': 'DASSH:Atrina', 'format':'image/png', 'transparent':'true'},
{'opacity': 1.0, 'isBaseLayer': false, 'visibility': true}
);
map.addLayers([gmap, gsat, wmslayer]);
map.addControl(new OpenLayers.Control.LayerSwitcher());
map.addControl(new OpenLayers.Control.MousePosition());
map.zoomToMaxExtent()
}
-------------------------------------------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------------------------------------------
On Sat, Dec 4, 2010 at 3:34 PM, Charles Galpin < [email protected] > wrote:
Matt, try setting the maxExtent of the map. Move the declaration of extent to
above the options and add
maxExtent: extent,
to the options.
hth,
charles
On Dec 4, 2010, at 10:00 AM, Matt Travis wrote:
Hi all
I'm trying to start a map using the following function. I want to open using
some prescribed bounds that are in long, lat (ESPG:4326) but i'm using google
maps for the baselayer so the projection is EPSG:900913. I thought the
following code would work ok but it just loads a blank map.
Regards
Matt
function init(){
// Map is in mercator this time, so over-ride the default
// options that assume lat/lon.
var options = {
projection: new OpenLayers.Projection("EPSG:900913"),
displayProjection: new OpenLayers.Projection("EPSG:4326"),
units: "m",
numZoomLevels: 20,
maxResolution: 156543.0339,
};
var extent = new OpenLayers.Bounds(-7.423, 50.102,
-0.383, 60.988).transform(
new OpenLayers.Projection("EPSG:4326),
new OpenLayers.Projection("EPSG:900913)
);
// Create the map object
map = new OpenLayers.Map('map', options);
// create Google Maps layer
var gmap = new OpenLayers.Layer.Google(
"Google Streets", // the default
{'sphericalMercator': true, numZoomLevels: 20}
);
// create Google Satellite layer
var gsat = new OpenLayers.Layer.Google(
"Google Satellite",
{type: G_SATELLITE_MAP, 'sphericalMercator': true, numZoomLevels: 20}
);
// create WMS Atrina layer
var wmslayer = new OpenLayers.Layer.WMS(
"Atrina",
" http://localhost:8080/geoserver/wms ",
{'layers': 'DASSH:Atrina', 'format':'image/png', 'transparent':'true'},
{'opacity': 1.0, 'isBaseLayer': false, 'visibility': true}
);
map.addLayers([gmap, gsat, wmslayer]);
map.addControl(new OpenLayers.Control.LayerSwitcher());
// Coordinate display at bottom of map
map.addControl(new OpenLayers.Control.MousePosition());
map.setCenter(extent, 5);
} _______________________________________________
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