From 3b0a4a30bb1392d14c58d2d3376fec5efe5c8560 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20T=C5=AFma?= <tumic@cbox.cz>
Date: Fri, 11 May 2018 20:06:16 +0200
Subject: [PATCH] Use precise arc second to radian transformation constants

---
 src/map/datum.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/map/datum.cpp b/src/map/datum.cpp
index f1fc76e5..7c2012b6 100644
--- a/src/map/datum.cpp
+++ b/src/map/datum.cpp
@@ -3,8 +3,8 @@
 #include "datum.h"
 
 
-#define as2rad(x) ((x) * 4.84814e-6)
-#define rad2as(x) ((x) * 206265.0)
+#define as2rad(x) ((x) * (M_PI/648000.0))
+#define rad2as(x) ((x) * (648000.0/M_PI))
 
 static Ellipsoid WGS84e = Ellipsoid(WGS84_RADIUS, WGS84_FLATTENING);
 static Datum WGS84 = Datum(&WGS84e, 0.0, 0.0, 0.0);