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Added description of coordinate system 

Thanks to @icewukong for this suggestion.

closes #35
This commit is contained in:
Josh Baker 2016-12-06 06:48:17 -07:00
parent 3c8b9b4110
commit 32014e7560
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README.md
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@ -32,6 +32,7 @@ Tile38 is an open source (MIT licensed), in-memory geolocation data store, spati
- Full [command line interface](#cli).
- Leader / follower [replication](#replication).
- In-memory database that persists on disk.
- All coordinates are in [WGS 84 Web Mercator / EPSG:3857](#coordinate-system)
## Components
- `tile38-server ` - The server
@ -77,6 +78,12 @@ $ ./tile38-cli
> help
```
## Coordinate System
It's important to note that the coordinate system Tile38 uses is
[WGS 84 Web Mercator](https://en.wikipedia.org/wiki/Web_Mercator), also known
as EPSG:3857. All distance are in meters and all calcuations are done on a spherical surface,
not a plane.
## <a name="cli"></a>Playing with Tile38
Basic operations: