the approach that Andre is proposing is actually used for a DTM matrix at http://www.carto.net/williams/yosemite/ each time the user pans or zooms, a new matrix of dtm values is transfered. The values that are displayed are interpolated bilinear. A serverside CGI script extracts the requested range and resolution from a quad-tree like structure. Even if, in my case the data is dtm values, it could be adopted to other grid values as well. In order to keep the transfer-rates low you can dynamically zip the data using Apache mod-gzip. In my case the dtm resolution varies a bit - a matrix is around 400x400 to 500x500 and the transfer size per matrix is around 120-160k. Andreas --- In [email protected], "Andre M. Winter - Carto.net" <[EMAIL PROTECTED]> wrote: > hi nicolas, > > you should be able to place the color value (or whatever value) info per px in a 2-dim js-array and access this on mousemove based on some returned screen coords. 600² is a lot but not too much for js. > > andré > > > -- >
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