From dedd2916926f1e7b0e9e774918faf6d1a7bcafbb Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Wed, 12 May 2021 15:36:11 +0200
Subject: Fix export of transformation to PROJ string in a particular situation
 where CompoundCRS are involved (fixes #2720)

---
 src/iso19111/operation/transformation.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/iso19111/operation/transformation.cpp b/src/iso19111/operation/transformation.cpp
index 8b822d51..6126d325 100644
--- a/src/iso19111/operation/transformation.cpp
+++ b/src/iso19111/operation/transformation.cpp
@@ -2806,14 +2806,14 @@ void Transformation::_exportToPROJString(
                                   common::UnitOfMeasure::ARC_SECOND);
 
         auto sourceCRSGeog =
-            dynamic_cast<const crs::GeographicCRS *>(sourceCRS().get());
+            extractGeographicCRSIfGeographicCRSOrEquivalent(sourceCRS());
         if (!sourceCRSGeog) {
             throw io::FormattingException(
                 "Can apply Geographic 2D offsets only to GeographicCRS");
         }
 
         auto targetCRSGeog =
-            dynamic_cast<const crs::GeographicCRS *>(targetCRS().get());
+            extractGeographicCRSIfGeographicCRSOrEquivalent(targetCRS());
         if (!targetCRSGeog) {
             throw io::FormattingException(
                 "Can apply Geographic 2D offsets only to GeographicCRS");
-- 
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