From 17b8566f303e0585d7cd775afd5d39da8058fdc3 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Thu, 13 Dec 2018 17:49:11 +0100
Subject: Prime meridian equivalence: increase tolerance

---
 src/datum.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'src/datum.cpp')

diff --git a/src/datum.cpp b/src/datum.cpp
index 9f9fb4ec..975a870a 100644
--- a/src/datum.cpp
+++ b/src/datum.cpp
@@ -388,7 +388,10 @@ bool PrimeMeridian::_isEquivalentTo(
         !IdentifiedObject::_isEquivalentTo(other, criterion)) {
         return false;
     }
-    return longitude()._isEquivalentTo(otherPM->longitude(), criterion);
+    // In MapInfo, the Paris prime meridian is returned as 2.3372291666667
+    // instead of the official value of 2.33722917, which is a relative
+    // error in the 1e-9 range.
+    return longitude()._isEquivalentTo(otherPM->longitude(), criterion, 1e-8);
 }
 //! @endcond
 
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