From 32014e75609bb4aecd6bb5673143b9698c711aa1 Mon Sep 17 00:00:00 2001 From: Josh Baker Date: Tue, 6 Dec 2016 06:48:17 -0700 Subject: [PATCH] Added description of coordinate system Thanks to @icewukong for this suggestion. closes #35 --- README.md | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/README.md b/README.md index 64416123..c9106b9c 100644 --- a/README.md +++ b/README.md @@ -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. + ## Playing with Tile38 Basic operations: