[OSM-talk] db and user statistics update

[Andy Robinson]

I found this a useful read:

http://cfis.savagexi.com/articles/2006/05/03/google-maps-deconstructed


Andy Robinson
Andy_J_Robinson at blueyonder.co.uk 

>-----Original Message-----
>From: talk-bounces at openstreetmap.org [mailto:talk-
>bounces at openstreetmap.org] On Behalf Of 80n
>Sent: 19 January 2007 10:57 AM
>To: Johnny Doe
>Cc: talk at openstreetmap.org
>Subject: Re: [OSM-talk] db and user statistics update
>
>On 1/19/07, Johnny Doe <uucp1 at yahoo.com> wrote:
>
>
>	--- "Robert (Jamie) Munro" <rjmunro at arjam.net> wrote:
>	>
>	> I know the author of the WMS-C
>	> layer will probably
>	> say Christopher Schmidt will say "But my projection
>	> is right and yours
>	> is wrong", but in fact they are both wrong.
>
>	I doubt that your (and probably everybody else')
>	GPS receiver uses a spheric Earth model
>	to calculate the latitude and longitude from
>	geocentric coordinates.
>	WMS-C Mercator definition based on WGS84 ellipsoid
>	is consistent with the measured lat/long data.
>
>
>Can anyone explain why a simple spheric model is not sufficient?  Does it
>result in cracks somewhere on the planet?  Are lat and lon coordinates
>incorrect for someone's street somewhere?  Is the distance between two
>points distorted in some way?
>
>There have been several discussions on this subject but I've not seen any
>explanation of why either one works better than than the other.
>
>80n
>
>
>
>
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