The scalebar created by MapServer 4.6 is too short when I'm using
epsg:3857. I'm guessing that it's correct at the equator and gets worse as
you get further north or south? Has anyone else experienced this and
possibly have a solution?
Thanks,
Rich
--
Richard W. Greenwood, PLS
No scalebar is ever correct on any map if the map is not having an 'equal area'
(sometimes called 'equivalent') projection -- meaning the areas are
comparable/not distorted over the map. The 3857, being a Mercator projection is
not, and indeed here the distortions reach from none at the equator
This is a larger error than simple map distortion. See screen shot below.
The orange dashed lines are a grid of 1 mile x 1 mile (5280 feet). The
upper scale bar that says "5000 ft" is generated by OpenLayers and is
pretty good. The lower scale bar is generated by MapServer is off by 25% to
30%.
