Make sure proj_get_source_crs() and proj_get_target_crs() work on 'pseudo' PJ object returned by proj_create_crs_to_crs() when there are several alternatives

1 files changed, 8 insertions, 0 deletions

diff --git a/src/iso19111/c_api.cpp b/src/iso19111/c_api.cpp
index 240d11b3..79732bab 100644
--- a/src/iso19111/c_api.cpp
+++ b/src/iso19111/c_api.cpp
@@ -1736,6 +1736,10 @@ PJ *proj_get_source_crs(PJ_CONTEXT *ctx, const PJ *obj) {
         }
         return nullptr;
     }
+    if (!obj->alternativeCoordinateOperations.empty()) {
+        return proj_get_source_crs(ctx,
+                                   obj->alternativeCoordinateOperations[0].pj);
+    }
     proj_log_error(ctx, __FUNCTION__,
                    "Object is not a BoundCRS or a CoordinateOperation");
     return nullptr;
@@ -1771,6 +1775,10 @@ PJ *proj_get_target_crs(PJ_CONTEXT *ctx, const PJ *obj) {
         }
         return nullptr;
     }
+    if (!obj->alternativeCoordinateOperations.empty()) {
+        return proj_get_target_crs(ctx,
+                                   obj->alternativeCoordinateOperations[0].pj);
+    }
     proj_log_error(ctx, __FUNCTION__,
                    "Object is not a BoundCRS or a CoordinateOperation");
     return nullptr;