[OSM-dev] Algorithm for converting lat/lon into Mercator as used in OSM PostGIS?

Nick Black nickblack1 at gmail.com
Mon Mar 12 11:00:54 GMT 2007


As much as it pains me to promote the work of a former lecturer,
"Datums and Map Projections" was pretty much the standard text we were
taught about projections and the like from.  Its short, concise, and
has worked examples that show how the equations relate to real-world

ISBN-10: 1870325281

Worth a trip to the library for anyway.

On 3/11/07, Kristian Thy <thy at 42.dk> wrote:
> On Sun, Mar 11, Nick Whitelegg wrote:
> > > Maybe it's just me being daft, but is there any real reason you want to
> > > do this massive duplication of effort? Can't you just link to libproj?
> >
> > Not if you want to implement it in javascript :-) (see earlier reference to
> > wishing to avoid unneccessary computations server side)
> See, it *was* me being daft :)
> > Besides, I'd like to understand what all these parameters actually *mean*...
> Something like this: http://www.remotesensing.org/proj/gen_parms.html ?
> More in-depth information than you can shake a stick at can be found in
> ftp://ftp.remotesensing.org/proj/proj.4.3.I2.pdf - it's dense, but it
> probably makes more sense than trying to read the Proj.4 source code ...
> \\kristian
> --
> Cthulhu.call();
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Nick Black

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