[Tilecache] maxExtent and BBOX setting

[Etides]

Hi, as Steve, I also need  to set the extent of a Tilecache layer as small as
possible to minimize the quantity of tiles created. I'm using Google layer
as a base map with OL... Is it possible or do I need to create all the
useless tiles to full the bbox that Google force me to use at a specific
lvl?

Thanks a lot.


Etienne


Steve.Toutant wrote:
> 
> Hello,
> I read several posts on bbox and maxExtent settings but I still can't make 
> tilecache works.
> I'm confuse with maxExtent, maxResolution and BBOX of OpenLayers 
> mapOptions, OpenLayers layer definition, tilecache.cfg and 
> tilecache_seed.py.
> 
> I need help for clarifying this please.
> Below are the different settings.
> thanks
> Steve
> 
> ************************OpenLayers 
> Options*********************************
> 
> var mapOptions = {
> projection: "EPSG:900913",//google
> displayProjection: new OpenLayers.Projection("EPSG:4326"), //Pour afficher 
> les coord lat long
> units: "m",
> maxExtent: new OpenLayers.Bounds(-9239517, 5465442, -5565974, 
> 9349764),//bbox google = bbox tilecache_seed.py
> maxResolution: "4892", //BEcause of minZoomLevel: 5 for google MAp
> controls: [],
> numZoomLevels: 20 //google
> };
> //basemap
> var googleM = new OpenLayers.Layer.Google( "Google Map", { minZoomLevel: 
> 5, type: G_NORMAL_MAP, 'sphericalMercator': true} );
> 
> ************************OpenLayers Layer definition 
> *********************************
> createTileCacheLayer
> (
>         'ilotsMiniTC', 'http://10.2.192.247/tilecache/dataWms', 
> 'ilotsMiniTC',
>         {
>                 REPROJECT: 'false',
>                 format:"image/gif",
>                 transparent: "true",
>                 maxExtent: new 
> OpenLayers.Bounds(-9239517,5465442,-7987172.729,5465442), // = bbox of 
> tilecache.cfg
>                 maxResolution: 4892,
>                 attribution:'ICU - INSPQ et 
> http://www.santepub-mtl.qc.ca/ DSP de Montréal '
>         }
> );
> 
> ************************TILECACHE.CFG*********************************
> 
> [ilotsMiniTC]
> type=WMSLayer
> url=http://localhost/cgi-bin/mapserv.exe?map=/ms4w/paccSante/map/paccsante_chaleur.map&
> extent_type=loose
> levels=15
> #Du niveau inférieur au niveau supérieur
> layers=ilotsLavalMini,ilotsMtlMini,ilotsMonteregieMini3,ilotsMonteregieMini1,ilotsMonteregieMini2,ilotsEstrieMini2,ilotsEstrieMini1,ilotsGatMini,ilotsLauMini2,ilotsLauMini1,ilotsLanMini,ilotsMauMini1,ilotsMauMini2,ilotsMauMini3,ilotsChauMini2,ilotsQcMini2,ilotsChauMini1,ilotsQcMini1
> extension=gif
> srs=EPSG:900913
> #metaTile=true
> metaBuffer=30
> #metaSize=10,10
> maxResolution=4892
> bbox=-9239517,5465442,-7987172.729,5465442
> #BBOX = maxExtent of OL Layer definition
> 
> ************************tilecache_seed.py************************
> BBOX = maxExtent of OL map options
> tilecache_seed.py -f ilotsMiniTC 0 2 -b "-9239517, 5465442, -5565974, 
> 9349764"
> 
> 
> 
> Steve Toutant, M. Sc.
> Analyste en géomatique
> Secteur environnement
> Direction des risques biologiques, environnementaux et occupationnels
> Institut national de santé publique du Québec
> 945, avenue Wolfe
> Québec, Qc G1V 5B3 
> Tél.: (418) 650-5115 #5281
> Fax.: (418) 654-3144
> steve.toutant at inspq.qc.ca
> http://www.inspq.qc.ca
>  
> 
> _______________________________________________
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> Tilecache at openlayers.org
> http://openlayers.org/mailman/listinfo/tilecache
> 
> 

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