I have a KMZ file that contains several image overlays (RF coverage plots).
I would like to convert the image overlays to polygons to decrease loading time in Google Maps.
Currently I'm tracing a rough outline of the image but that is labor intensive and not very accurate.
Is there a way to automatically convert a image to a polygon?
I have Google Earth and Manifold GIS. ArcScan looks promising but it is outside of my budget.