This demo uses a raster operation to classify layer based data.
This example uses a OpenLayers.Raster.Operation to
create a hypothetical classification scheme for data derived from
a WMS layer. The resulting data is displayed on the map with
a OpenLayers.Layer.Raster. The classification
is run whenever breakpoint values are adjusted with the slider.
See the raster-classification.js source for details on how this is done.