[Proj] Canonic North-American Projection
gerald.evenden at verizon.net
Tue Feb 22 19:56:59 EST 2005
One of the nicest for NA that I can recall is the Chamberlin Trimetric
National Geographic Society uses---or, at least, once used. The
Conic does a nice job for NA and SA combined. Realistically, oblique
would work. I would not be much in favor of the conics if covering US
& Canada in
the same map. More important, consider if one wants equal-area as a
requirement. For small scale maps conformality is is of little
As a bottom line, there is no "canonical" map for NA. People are used
all sorts of lousy projection choices and ignore the distortions: like
just the conterminous US.
If you have any sense of artistic judgement, pick one that looks good.
On Feb 22, 2005, at 4:24 PM, Patrick Mézard wrote:
> [Sorry if this message is a dupe. First, I tried to send through the
> gmane interface but the previous mail seemed to have disappeared in
> I would like to know if there are canonical projections to display
> maps of North America (USA + Canada). I am not looking for specific
> properties, just to find a representation US people are accustomed to
> (think US elections results maps for instance).
> I thought there would be some kind of Lambert Conic projection that
> USGS or other official agencies would prefer among others but I cannot
> find any sanctified datum/transformation. Web searches or quick looks
> to MapInfo returns several proposals for secant parallels for Lambert
> SP2 projections applied to NAD27 datums but no canonic one.
> What should I use ? Is there one with a registed ESPG or GeoTiff
> identifier ?
> Thank you for any hint.
> Patrick Mézard
> Proj mailing list
> Proj at xserve.flids.com
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