[Tilecache] maxExtent and BBOX setting

[Steve.Toutant at inspq.qc.ca]

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 <a 
href="http://www.santepub-mtl.qc.ca/" target="_blank">DSP de Montréal</a>'
        }
);

************************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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