For my purpose I can ignore flattening and can assume a radius, because I
need fast math. My requirement is it must not be smaller, and it should be
consistent for conceptional reasons (but not for mathematical or
technical).
Note that the mentioned values come from OSM (as most other maps) using
"Stadin, Benjamin" writes:
> I indeed need to express distances in meters. This is a sinusoidal
> grid with Varying cell resolutions, matching the length of web
> mercator tiles at the equator. I could use any value greater or equal
> to the defined sphere radius, but not smaller. To be consis
;>
Datum: Samstag, 18. Juni 2016 um 07:38
An: Benjamin Stadin
mailto:benjamin.sta...@heidelberg-mobil.com>>,
OSM Dev List mailto:dev@openstreetmap.org>>
Betreff: Re: [OSM-dev] Earth radius
Hi,
OSM uses EPSG:4326 for storing coordinates and EPSG:3857 for rendering.
You can get pr
I indeed need to express distances in meters. This is a sinusoidal grid
with
Varying cell resolutions, matching the length of web mercator tiles at the
equator.
I could use any value greater or equal to the defined sphere radius, but
not smaller.
To be consistent, it should be equal.
Ben
Am
Hi,
OSM uses EPSG:4326 for storing coordinates and EPSG:3857 for rendering.
You can get projection definitions on http://epsg.io/4326 and
http://epsg.io/3857 respectively, or find it bundled with proj4 library
that is widely used to deal with projection nuances.
сб, 18 июн. 2016 г. в 1:37, Stadi
Hi,
I want to double check the earth radius used by OSM and zoom levels is
exactly 6372.7982 as said here:
http://wiki.openstreetmap.org/wiki/Zoom_levels.
I couldn¹t find this as constant in the sources yet. I¹m creating a new
storage system for vector tiles, independent of a projection.
Best
Be
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