[OSM-newbies] Interpolating a point
vidthekid at gmail.com
Tue Oct 13 11:00:42 BST 2009
On Mon, Oct 12, 2009 at 10:36 PM, Chris Hunter <chunter952 at gmail.com> wrote:
> If someone does feel like coding up an intersection/resection surveying
> plugin for JOSM, it looks like many of the calculations involve Vicenty's
Wow that's complicated. Sure, that's the way to go if you need
millimeter precision. I actually had in mind some much simpler
methods with a flat earth approximation and a relatively simple
cylindrical projection. On smaller scales (distances on the order of
one mile) the precision should be pretty good, like less than 1%
error. You'd introduce greater errors than that just in the process
of taking magnetic compass readings.
Really, why would you need better precision than that? If you can't
get close to a feature for whatever reason, that probably means there
are no other mapped or mappable features very close to it. If a dot
on the map is off by 50 feet, but there's no other feature on the map
for a mile around, is there really a problem? You could use
professional surveying equipment and complicated algorithms to bet
better precision, but in the context of OpenStreetMap, I don't think
it's worth the trouble.
Oh, and I really don't mean to discourage anyone. If someone actually
goes to the trouble, I'll be impressed.
a.k.a. Vid the Kid
Does this font make me look fat?
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