Another technique designed to meet this requirement is UTFGrid: https://www.mapbox.com/foundations/an-open-platform/#utfgrid
OpenLayers apparently has support for UTFGrids: Doc: http://dev.openlayers.org/apidocs/files/OpenLayers/Control/UTFGrid-js.html Example: http://openlayers.org/dev/examples/utfgrid.html The tricky part is generating the UFTGrid! Not sure what tools there are out there for doing this. It would be nice if there was a map server which could generate these on-the-fly... On Wed, Jun 25, 2014 at 3:35 AM, Rob Marjot <rob.mar...@gmail.com> wrote: > Dear list, > > I'm in the quest of developing a performant webmapping application > involving large, complex vector objects (pipelines) originating from CAD. > In the application, these objects need to be interactive. > > Whether complex or not: the vectors will only be (possibly partly: clipped > by the map extents) rendered to a limited number of pixels. In OpenLayers > 3, this idea is exploited: before rendering vectors are pre-processed by > quantizing (and removing duplicate / co-linear) coordinates. (The > algorithm has been implemented by Tim Schaub > <http://tschaub.net/blog/2014/03/04/topology-preserving-simplification.html> > ). > > Applying quantization (and clipping) dramatically reduces the serialized > (GeoJSON) size of the geometries. Yet, since my coordsys is in meters, > exchanging pixel coordinates will reduce the size even further... > > My question: is there a layer type that takes pixel coordinates, relative > to a map corner? Effectively, this would allow me to create hotspots on a > map that was rendered purely serverside. > > I fully understand (and tend to accept) the downside of required traffic > upon each panning / zooming. It will be acceptable to request a refresh of > hotspots with a delay of a 1 sec or so. > > Otherwise, I'm open to any suggestion taking another approach :)) > > Thank you in advance! > > Rob > > _______________________________________________ > Users mailing list > us...@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/openlayers-users >
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