[OpenLayers-Users] Disappear layers with large scale google maps
Ishikawa Hiroshi
ishikawa at geowork.co.jp
Wed Feb 14 22:51:59 EST 2007
Thanks for everyone.
I could succeed display layers with the largest scale of googlemaps.
I feel this is a quite simple problem.
I'm wondering that the problem is the value of "MAX_ZOOM_LEVEL" and "RESOLUTIONS" in the Google.js.
I chenged the valuse of "MAX_ZOOM_LEVEL" to 20 and added three small scales to
RESOLUTIONS.
Now my RESOLUTIONS is
RESOLUTIONS:[1.40625,0.703125,0.3515625,0.17578125,0.087890625,0.0439453125,0.02197265625,0.010986328125,0.0054931640625,0.00274658203125,0.001373291015625,0.0006866455078125,0.00034332275390625,0.000171661376953125,0.0000858306884765625,0.00004291534423828125,0.0000214576721191140625,0.000107288360595703125,0.0000053644182978515625,0.000002682209014892578125],
As a resulet I can see more zoomed maps on the openlayers.
When we use Google Satellite we mightn't notice.
But with a normal map we could recognize the difference.
best wish,
Ishikawa Hiroshi
On Thu, 15 Feb 2007 05:00:50 +0900, Arnd Wippermann <arnd.wippermann at web.de> wrote:
> Hello,
>
> The solution, which I'm using for displaying all zoomlevels for Google and the WMS, is something i have found in the mailing list for OpenLayers Dev (http://www.nabble.com/Google-Zoom-Levels-tf2644005.html) and is from Ludwig Max Brinckmann.
>
> Put this in your html
>
> <script type="text/javascript" src="OpenLayers2.2.js"></script>
> <!-- Overwrite the original class -->
> <script type="text/javascript" src="Google_ludwig.js"></script>
>
> <script>
>
> ...
> //somthing like this
> map = new OpenLayers.Map('map', {maxExtent: new OpenLayers.Bounds(myBounds[0], myBounds[1], myBounds[2], myBounds[3]), maxResolution: mymaxResolution, projection: mySRS, maxZoomLevel: mymaxZoomLevel, controls:[],'numZoomLevels':22 } );
>
> //and this
> googleLyr = new OpenLayers.Layer.Google( "Google Satellite" , {type: G_SATELLITE_MAP, 'maxZoomLevel':22} );
>
> ...
>
> </script>
>
> And save this as Google_ludwig.js
>
> /*#################################################
> Google_ludwig.js
> #################################################*/
>
> OpenLayers.Layer.Google=OpenLayers.Class.create();
> OpenLayers.Layer.Google.prototype=
> OpenLayers.Class.inherit(OpenLayers.Layer.EventPane,
> OpenLayers.Layer.FixedZoomLevels,
> {
> MIN_ZOOM_LEVEL:0,
> MAX_ZOOM_LEVEL:22,
> RESOLUTIONS:[1.40625,0.703125,0.3515625,0.17578125,0.087890625,0.0439453125,0.02197265625,0.010986328125,0.0054931640625,0.00274658203125,0.001373291015625,0.0006866455078125,0.00034332275390625,0.000171661376953125,0.0000858306884765625,0.00004291534423828125,0.0000214576721191140625,0.000107288360595703125,0.0000053644182978515625,0.000002682209014892578125,0.0000013411045074462890625,0.00000067055225372314453125],
>
> type:null,
>
> initialize:function(name,options){
> OpenLayers.Layer.EventPane.prototype.initialize.apply(this,arguments);
> OpenLayers.Layer.FixedZoomLevels.prototype.initialize.apply(this,arguments);
> this.addContainerPxFunction();
> },
>
> loadMapObject:function(){
> try{
> this.mapObject=new GMap2(this.div);
> var poweredBy=this.div.lastChild;
> this.div.removeChild(poweredBy);
> this.pane.appendChild(poweredBy);
> poweredBy.className="olLayerGooglePoweredBy gmnoprint";
> poweredBy.style.left="";
> poweredBy.style.bottom="";
> var termsOfUse=this.div.lastChild;
> this.div.removeChild(termsOfUse);
> this.pane.appendChild(termsOfUse);
> termsOfUse.className="olLayerGoogleCopyright";
> termsOfUse.style.right="";
> termsOfUse.style.bottom="";
> }catch(e){
> }
> },
>
> setMap:function(map){
> OpenLayers.Layer.EventPane.prototype.setMap.apply(this,arguments);
> if(this.type!=null){
> this.map.events.register("moveend",this,this.setMapType);
> }
> },
>
> setMapType:function(){if(this.mapObject.getCenter()!=null){this.mapObject.setMapType(this.type);
> this.map.events.unregister("moveend",this,this.setMapType);
> }},
>
> onMapResize:function(){
> this.mapObject.checkResize();
> },
>
> getOLBoundsFromMapObjectBounds:function(moBounds){
> var olBounds=null;
> if(moBounds!=null){
> var sw=moBounds.getSouthWest();
> var ne=moBounds.getNorthEast();
> olBounds=new OpenLayers.Bounds(sw.lng(),sw.lat(),ne.lng(),ne.lat());
> }
> return olBounds;
> },
>
> getMapObjectBoundsFromOLBounds:function(olBounds){
> var moBounds=null;
> if(olBounds!=null){
> var sw=new GLatLng(olBounds.bottom,olBounds.left);
> var ne=new GLatLng(olBounds.top,olBounds.right);
> moBounds=new GLatLngBounds(sw,ne);
> }
> return moBounds;
> },
>
> addContainerPxFunction:function(){
> if(typeof GMap2!="undefined"&&!GMap2.fromLatLngToContainerPixel)
> {
> GMap2.prototype.fromLatLngToContainerPixel=function(gLatLng)
> {
> var gPoint=this.fromLatLngToDivPixel(gLatLng);
> var div=this.b.firstChild.firstChild;
> gPoint.x+=div.offsetLeft;
> gPoint.y+=div.offsetTop;
> return gPoint;
> };
> }
> },
>
> getWarningHTML:function()
> {
> var html="";
> html+="The Google Layer was unable to load correctly.<br>";
> html+="<br>";
> html+="To get rid of this message, select a new BaseLayer "
> html+="in the layer switcher in the upper-right corner.<br>";
> html+="<br>";
> html+="Most likely, this is because the Google Maps library";
> html+=" script was either not included, or does not contain the";
> html+=" correct API key for your site.<br>";
> html+="<br>";
> html+="Developers: For help getting this working correctly, ";
> html+="<a href='http://trac.openlayers.org/wiki/Google' "
> html+="target='_blank'>";
> html+="click here";
> html+="</a>";
> return html;
> },
>
> setMapObjectCenter:function(center,zoom){this.mapObject.setCenter(center,zoom);
> },
>
> getMapObjectCenter:function(){return this.mapObject.getCenter();
> },
>
> getMapObjectZoom:function(){return this.mapObject.getZoom();
> },
>
> getMapObjectLonLatFromMapObjectPixel:function(moPixel){return this.mapObject.fromContainerPixelToLatLng(moPixel);
> },
>
> getMapObjectPixelFromMapObjectLonLat:function(moLonLat){return this.mapObject.fromLatLngToContainerPixel(moLonLat);
> },
>
> getMapObjectZoomFromMapObjectBounds:function(moBounds){return this.mapObject.getBoundsZoomLevel(moBounds);
> },
>
> getLongitudeFromMapObjectLonLat:function(moLonLat){return moLonLat.lng();
> },
>
> getLatitudeFromMapObjectLonLat:function(moLonLat){return moLonLat.lat();
> },
>
> getMapObjectLonLatFromLonLat:function(lon,lat){return new GLatLng(lat,lon);
> },
>
> getXFromMapObjectPixel:function(moPixel){return moPixel.x;
> },
>
> getYFromMapObjectPixel:function(moPixel){return moPixel.y;
> },
>
> getMapObjectPixelFromXY:function(x,y){return new GPoint(x,y);
> },
>
> CLASS_NAME:"OpenLayers.Layer.Google"
> }
> );
>
> Than it should work.
>
> Arnd Wippermann
>
> -----Ursprüngliche Nachricht-----
> Von: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org] Im Auftrag von Ishikawa Hiroshi
> Gesendet: Mittwoch, 14. Februar 2007 03:15
> An: Christopher Schmidt
> Cc: OpenLayers ML
> Betreff: Re: [OpenLayers-Users] Disappear layers with large scale google maps
>
> Hi, Christopher
>
> I've tried your suggestion.
> But I cound't succeed probably my way was wrong.
>
> Could you show a sample?
>
> How should I change that? I copyed from the example page.
> map = new OpenLayers.Map( $('map') ,
> { controls: [new OpenLayers.Control.MouseDefaults()] , 'numZoomLevels':20});
> var satellite = new OpenLayers.Layer.Google( "Google Satellite" , {type: G_NORMAL_MAP, 'maxZoomLevel':18} );
> map.addLayers([satellite]);
>
> var twms = new OpenLayers.Layer.WMS(
> "World Map",
> "http://world.freemap.in/cgi-bin/mapserv?",
> {map: '/www/freemap.in/world/map/factbooktrans.map', transparent:'true', layers: 'factbook', 'format':'png'} );
> map.addLayer(twms);
>
>
> On Tue, 13 Feb 2007 23:27:08 +0900, Ishikawa Hiroshi <ishikawa at geowork.co.jp> wrote:
>
>> Hi, Christopher
>>
>> Thanks for the reply.
>>
>> Ishikawa Hiroshi
>>
>> On Tue, 13 Feb 2007 21:41:24 +0900, Christopher Schmidt <crschmidt at metacarta.com> wrote:
>>
>>> On Tue, Feb 13, 2007 at 07:26:25PM +0900, Ishikawa Hiroshi wrote:
>>>> Dear all,
>>>>
>>>> I'm facing a problem that a layer disappear when I use with large scale google maps.
>>>> We can see this problem on the page that is an openlayers official example page.
>>>> http://openlayers.org/dev/examples/google.html
>>>>
>>>> There is a world map(coast line) layer on the page.
>>>> When I zoom in the largest zoom level or the 2nd largest zoom level
>>>> the check box become a disable status.
>>>>
>>>> Is this a bug or a regulation of google maps?
>>>
>>> This is a bug. You can change the behavior by adding 'numZoomLevels: 20'
>>> or something similar to your overlay when creating the layer. (This
>>> should be added as an option to the layer.)
>>>
>>> I'll file this as a bug to get fixed in 2.4.
>>>
>>> Regards,
>> _______________________________________________
>> Users mailing list
>> Users at openlayers.org
>> http://openlayers.org/mailman/listinfo/users
>>
>
>
>
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> 有限会社ジオ・ワーク 石川博司
> 〒514-8507 三重県津市栗真町屋町１５７７
> 三重大学 創造開発研究センター内
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> E-Mail: ishikawa at geowork.co.jp
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>
>
--
************************************
有限会社ジオ・ワーク 石川博司
〒514-8507 三重県津市栗真町屋町１５７７
三重大学 創造開発研究センター内
TEL/FAX：059-231-5484
http://www.geowork.co.jp
E-Mail: ishikawa at geowork.co.jp
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