[Proj] Polyconic web page typo?

Mikael Rittri Mikael.Rittri at carmenta.com
Wed Sep 28 06:27:30 EST 2011

Hello Carl,

> corrected to say +proj=poly instead of +proj=stere 
I agree.

> also to include +k.

No, as far as I can see, +proj=poly does not support a scale factor +k.
I would say that a scale factor is normally used only with a conformal
projection, and the polyconic is not conformal.  Snyder's formulas* for
the polyconic does not mention a scale factor (unless I overlooked it). 

*John P. Snyder. Map Projections: A Working Manual.

Best regards,

Mikael Rittri


From: proj-bounces at lists.maptools.org [mailto:proj-bounces at lists.maptools.org] On Behalf Of Carl Godkin
Sent: den 27 september 2011 13:29
To: PROJ.4 and general Projections Discussions
Subject: [Proj] Polyconic web page typo?


I was looking for some information on American Polyconic and came across
this page:


I think the PROJ.4 information at the bottom of the page should be 
corrected to say +proj=poly instead of +proj=stere and also to 
include +k.  Or am I missing something?



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