1 files changed, 12 insertions, 0 deletions
diff --git a/src/iso19111/static.cpp b/src/iso19111/static.cpp
index 11306e35..d099cd6c 100644
--- a/src/iso19111/static.cpp
+++ b/src/iso19111/static.cpp
@@ -39,6 +39,7 @@
 #include "proj/metadata.hpp"
 #include "proj/util.hpp"
 
+#include "operation/oputils.hpp"
 #include "proj/internal/coordinatesystem_internal.hpp"
 #include "proj/internal/io_internal.hpp"
 
@@ -653,6 +654,17 @@ const GeographicCRSNNPtr
 const std::string
     operation::CoordinateOperation::OPERATION_VERSION_KEY("operationVersion");
 
+//! @cond Doxygen_Suppress
+const common::Measure operation::nullMeasure{};
+
+const std::string operation::INVERSE_OF = "Inverse of ";
+
+const std::string operation::AXIS_ORDER_CHANGE_2D_NAME =
+    "axis order change (2D)";
+const std::string operation::AXIS_ORDER_CHANGE_3D_NAME =
+    "axis order change (geographic3D horizontal)";
+//! @endcond
+
 // ---------------------------------------------------------------------------
 
 NS_PROJ_END