Re: [OSM-talk] How inaccurate was the mapnik distance/scale marker?

2010-02-24 Thread Dave F.
Hi Thanks for your replies Egil Hjelmeland wrote: I assume you are referring to the OpenLayers based slippy map at openstreetmap.org? The Openlayers 2.8 ScaleLine class has the the problem that it does not handle that the map-scale is not constant accoss the map. The slippy map uses

Re: [OSM-talk] How inaccurate was the mapnik distance/scale marker?

2010-02-24 Thread Egil Hjelmeland
Dave F. wrote: Excuse my ignorance, are you saying that it's 2x inaccurate at all zoom levels? At lattitude 60: yes. So one of the mapnik guys could implement it quite easily then? I don't think it is related to mapnik. It is the javascript code served by the web-site that wraps up the

Re: [OSM-talk] How inaccurate was the mapnik distance/scale marker?

2010-02-24 Thread Richard Weait
On Wed, Feb 24, 2010 at 8:42 AM, Egil Hjelmeland pri...@egil-hjelmeland.no wrote: Dave F. wrote: So one of the mapnik guys could implement it quite easily then? I don't think it is related to mapnik. It is the javascript code served by the web-site that wraps up the map rendered by mapnik,

[OSM-talk] How inaccurate was the mapnik distance/scale marker?

2010-02-23 Thread Dave F.
Hi There used to be a distance indicator graphic in the bottom left of the map. I believe it was removed because it was inaccurate due to the curvature of the Earth. I can understand the point at low zoom levels, but at say, zoom 13, just how inaccurate, percentage wise, is it? I found it

Re: [OSM-talk] How inaccurate was the mapnik distance/scale marker?

2010-02-23 Thread Egil Hjelmeland
I assume you are referring to the OpenLayers based slippy map at openstreetmap.org? The Openlayers 2.8 ScaleLine class has the the problem that it does not handle that the map-scale is not constant accoss the map. The slippy map uses mercators projection, where the scale increases with