Add fallback_strategy to tinshift transform

 - this bumps format_version of tinshift JSON to 1.1 for the new field
   fallback_strategy
 - the default behaviour without that field is retained
 - if fallback_strategy is set to "nearest_side", then points that do not fall
   into any of the triangles will be transformed according to the nearest
   triangle
 - if fallback_centroid is set to "nearest_side", then points that do not fall
   into any of the triangles will be transformed according to the triangle
   with the nearest centroid

1 files changed, 11 insertions, 0 deletions

diff --git a/src/transformations/tinshift.hpp b/src/transformations/tinshift.hpp
index cc8771b3..f826e08a 100644
--- a/src/transformations/tinshift.hpp
+++ b/src/transformations/tinshift.hpp
@@ -53,6 +53,12 @@
 
 namespace TINSHIFT_NAMESPACE {
 
+enum FallbackStrategy {
+    FALLBACK_NONE,
+    FALLBACK_NEAREST_SIDE,
+    FALLBACK_NEAREST_CENTROID,
+};
+
 using json = nlohmann::json;
 
 // ---------------------------------------------------------------------------
@@ -93,6 +99,10 @@ class TINShiftFile {
      */
     const std::string &publicationDate() const { return mPublicationDate; }
 
+    const enum FallbackStrategy &fallbackStrategy() const {
+        return mFallbackStrategy;
+    }
+
     /** Basic information on the agency responsible for the model. */
     struct Authority {
         std::string name{};
@@ -204,6 +214,7 @@ class TINShiftFile {
     std::string mLicense{};
     std::string mDescription{};
     std::string mPublicationDate{};
+    enum FallbackStrategy mFallbackStrategy {};
     Authority mAuthority{};
     std::vector<Link> mLinks{};
     std::string mInputCRS{};