From: Arne K. <ak...@op...> - 2008-03-31 13:42:48
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Once GeoWebCache is in GeoServer you can probably use xyz directly, but if you want your data uncached or right now, without GWC, then you need to convert to 900913 coordinates (note that they are not lat/lon). To convert to 900913 coordinates: http://code.google.com/apis/maps/documentation/overlays.html#Tile_Overlays Note that they have switched x and y on the second grid (documentation bug) , and use the bounding box mentioned below for world bounds. The required code should be very simple. -Arne Javier de la Torre wrote: > Hi Arne, > > Thanks for the info. > > I am trying to adjust my app now to work with 900913 projection, but I > am struggling a bit. > > I am using a flex client that does not know anything about WMS and > projections so I have to handle it myself. Converting Google tiles to > 4326 coordinates was not that complicate, but know I am lost on how to > convert from the X,Y,Z tile information I have in the client to a bbox > in 900913 for a wms url request. > > Do you know how can I convert from Google tiles number X,Y and Z (zoom > level) to this bbox? OpenLayer must be doing the same at some point > but I cant figure out. > > Thanks in advance. > > Javier. > > > On 28/02/2008, at 16:00, Arne Kepp wrote: >> Javier de la Torre wrote: >>> Thats great! >>> >>> I checked on the geoserver wiki but did not find this info. I will try >>> to update the info there once I have my map working. >>> >>> Anjother question. To use this projection what kind of coordinates I >>> have to send? The X and Y tile parameters that Google uses or still >>> the bounding box in lat/lon? >>> >> In spherical mercator the world is a square and the world bounding >> box is >> -20037508.34 -20037508.34 20037508.34 20037508.34 >> (max west , max south, max east , max north) >>> On the other hand I was thinking on using Amazon S3 to create a cache >>> for the requests I produce, anybody has done something similar? >>> >> Tilecache.org currently has some kind of support for this, though I >> haven't tried it yet. I'm working on getting it into geowebcache.org, >> which we hope to ship with GeoServer before long. >> >>> And if someone is interested I have created a Google Maps Interface >>> using Flex. >>> >> Always curios to have a look, is there a demo? >> >> -Arne > > > !DSPAM:4038,47f0d30b91595219720167! > |