[OpenLayers-Users] createRegularPolygon 'circle' radius units?

darethehair darethehair at gmail.com
Thu Sep 6 15:09:27 PDT 2012


Phil Scadden wrote
> 
> I would note that the circle is 1600 wide (as expected) but the scale 
> distance between roads ~ 2500m. You are running foul of the fact
> mercator a terrible projection for this kind of use. ie the ratio of map 
> distance to true distance gets large as you move towards the poles. On a 
> good map in mercator, you will see often that varying scale in the legend.
> 

I appreciate the efforts of Stephen and yourself to help me with my
difficulties!

However, unless I am misunderstanding some of what you are saying, I don't
think the circle *is* 1600m wide -- if it was, it would be the same size as
one of the mile squares.  I think the circle *and* scales are both wrong
(?).   I suspect that if I were to 'fix' the circle size, that the 'scale'
would be fixed at the same time (?). 

Now, for a solution, I can certainly try the math adjustment that you
suggest, but if there is a better projection for me to use in my code to
avoid any unnecessary unit conversions, please let me know how to do so.



--
View this message in context: http://osgeo-org.1560.n6.nabble.com/createRegularPolygon-circle-radius-units-tp5000250p5000301.html
Sent from the OpenLayers Users mailing list archive at Nabble.com.


More information about the Users mailing list