Re: [Geographiclib-users] Find S12 using planimeter

[Mike T. <mw...@gm...>]

Great, thanks, I think that clears up my questions with my assumptions
on the quadrilateral for S12. And yes, the absolute error of residual
with the technique described previously increases approaching the
(1-f)*180 deg edges.

The planimeter approach is what I'm interested in. Out of curiosity,
are there any test datasets that can be used to check the accuracy of
polygon area calculations? Also, how does the error of polygon area
calculation accumulate? For instance, I see the expected error of S12
is 0.1 m^2. Does the error relate to the number of vertices in the
polygon in combination to the length of each edge? I just looking for
a general idea, nothing exhaustive.

Thanks in advance,
-Mike