----------------------------Original message---------------------------- Anne Sutherland posed the following question, which Alberta Wood cross- posted to MAPS-L > Has anyone out there come across a red/green 3D map showing a part of > New York - (red/green spectacles provided) - by Tobar Limited, St > Margaret, Harleston, Norfolk IP20 0PJ. Telephone number, 0986-82537. We > have been given one. Buildings are shown more or less bird's eye view > style. Other than a separate description of 3 Dimensional images and > how they work etc. no further information is given other than mentioning > that 3D photography is used for, amongst other things, map making. Any > of you folk seen other examples? I am just curious. These maps are called anaglyphs and were quite popular some decades ago. There are a number of examples in the Relief Forms Atlas produced by (I think) the French IGN. They are enjoying an upsurge of interest because modern computer technology can calculate the off-sets for the red and green (blue and red is a variant) images. The Japanese Earth Resources Satellite Data Centre in Tokyo produced some very nice anaglyphs from their satellite imagery a few years ago, and I believe that at least one of the big GIS vendors now includes capabilities of creating and displaying anaglyphs on-screen (Intergraph comes to mind but I could be mistaken) as one form of visualisation of terrain models. I am sure that there are many other examples around the world.... Darius Bartlett