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

[Phil Scadden]

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.

Fixing it. From memory, for spherical mercator scale is h=1/cos(lat), so 
instead of 800, you would use 800/cos(lat). You need to be very careful 
that the projection you use for a map is "fit for purpose". If distance 
is important, then the distance from OL is meters on the projection and 
you might want to correct that to true scale.

Notice: This email and any attachments are confidential. If received in error please destroy and immediately notify us. Do not copy or disclose the contents.