[OSRS-PROJ] Donald Elliptic Projection for AT&T V&H Coordinates?
gerald.evenden at verizon.net
Wed Nov 27 12:23:37 EST 2002
Hmmm. Seems to be a two-point-equidistant projection for the ellipsoid.
I can't imagine why they went to that trouble just for simple rate calculations---
no wonder the rates are high.
proj=tpeqd is not set up for the ellipsoid.
Ed McNierney wrote:
> Folks -
> I have a user request to be able to select locations based on the V & H coordinate system used in North American telephone tariff calculations. I had never heard of this before - after a bit of research, I found (a) several pretty pictures of North America with a grid overlay on it, (b) references to the "Donald Elliptic Projection" used as developed by a fellow named Donald at Bell Labs in 1957, (c) a CD-ROM I can purchase with Excel spreadsheet formulas for lat/lon conversion, and (d) a $495 book from Telcordia titled "Telcordia(tm) Notes on V&H Coordinates: The Mystery Unveiled".
> What I'd much prefer is a PROJ definition for this projection <g>. If anyone can point me to the projection definition, or to conversion formulas, I'd appreciate it. Thanks!
> - Ed
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