[OSM-dev] Algorithm for converting lat/lon into Mercator as used in OSM PostGIS?
Nick Whitelegg
nick at hogweed.org
Sun Mar 11 11:24:41 GMT 2007
Hello Artem,
> Nick,
>
> see below
>
Tried this (literally direct copy and paste) but I don't get the same answer
as the Mapnik conversion. For example, with bbox -0.75, 51.02, -0.7, 51.07
here is what I get from a test program:
Mapnik projection conversion, using PROJ.4 (correct with respect to the
PostGIS database):
-83489
6591595
-77923
6600425
Older OSM Mercator conversion code:
-83489
6624832
-77923
6633685
Your sample code:
-4783602
5317872
-4464695
5764860
The last one seems to be in the wrong scale, as the box is supposed to be
about 6km x 9km. Are there any other parameters I need to set?
Thanks,
Nick
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