[OpenMap Users] What does the scale *really* represent?

        Hi folks. I have a question about the mathematical foundations
        of the scale value in the Projection interface.

        I'm trying to puzzle out how one would write an adapter from
        a reasonable subset of the OpenGIS coordinate transform API
        to OpenMap's projection API. I believe that scale in an OpenGIS
        ProjectedCoordinateSystem object is represented as
        meters / unit (aka pixel). The OpenMap API docs claim that
        the scale value of a Projection is represented as pixels/meter.
        However, in the list archives, Don says something to this
        effect:

        "Actually, the scale parameter is a ratio, and is doesn't have
         units. It just has its roots based on a pixels/meter constant."
        
        So, how is the scale parameter actually derived?

- Matt

--
[To unsubscribe to this list send an email to "majdart@bbn.com"
with the following text in the BODY of the message "unsubscribe openmap-users"]