----------------------------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