thanks Andrew Leach let me try that and see where it takes me regards xeus On Oct 27, 4:06 am, Andrew Leach <[email protected]> wrote: > On 27 October 2011 11:49, xeus <[email protected]> wrote: > > > guys hi, > > am working on a project (http://m4water.org/m4wmaps/phjs.php) which > > requires all markers to appear if they are within an active polygon > > and all those outside the polygon not to appear.from the project url > > its self evident. thanks. > > Cor. What a lot of data you give to the page! > > I would suggest the best way to deal with this amount of data is only > fetch what you need, when you need it. That is: > > - User clicks on a polygon choice > - You clear any existing markers > - You change the polygon's colour > - You download the data for that polygon (using GDownloadUrl and a > server-side script which provides the data) > - You display the points > > That requires either an extra field in your database for the subcounty > which you can use to determine which points to select, or a bit of > point-in-polygon analysis. The first is definitely a better method of > selection. > > You could use point-in-polygon analysis, though, to determine which > subcounty contains a point clicked by a user: then use that as the > polygon choice instead of the radio button and proceed as before. > 4.
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