From 14b0496b00f2acda1085efdedfb432a993cf758d Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Sun, 22 Nov 2020 23:16:48 +0100
Subject: projinfo.cpp: improve hint when to use --spatial-test intersects

---
 src/apps/projinfo.cpp | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/apps/projinfo.cpp b/src/apps/projinfo.cpp
index 37b76346..c87b23a2 100644
--- a/src/apps/projinfo.cpp
+++ b/src/apps/projinfo.cpp
@@ -689,6 +689,7 @@ static void outputOperations(
 
     std::vector<CoordinateOperationNNPtr> list;
     size_t spatialCriterionPartialIntersectionResultCount = 0;
+    bool spatialCriterionPartialIntersectionMoreRelevant = false;
     try {
         auto authFactory =
             dbContext
@@ -714,10 +715,15 @@ static void outputOperations(
                 ctxt->setSpatialCriterion(
                     CoordinateOperationContext::SpatialCriterion::
                         PARTIAL_INTERSECTION);
-                spatialCriterionPartialIntersectionResultCount =
-                    CoordinateOperationFactory::create()
-                        ->createOperations(nnSourceCRS, nnTargetCRS, ctxt)
-                        .size();
+                auto list2 =
+                    CoordinateOperationFactory::create()->createOperations(
+                        nnSourceCRS, nnTargetCRS, ctxt);
+                spatialCriterionPartialIntersectionResultCount = list2.size();
+                if (spatialCriterionPartialIntersectionResultCount == 1 &&
+                    list.size() == 1 &&
+                    list2[0]->nameStr() != list[0]->nameStr()) {
+                    spatialCriterionPartialIntersectionMoreRelevant = true;
+                }
             } catch (const std::exception &) {
             }
         }
@@ -736,6 +742,10 @@ static void outputOperations(
                      "more results ("
                   << spatialCriterionPartialIntersectionResultCount << ")"
                   << std::endl;
+    } else if (spatialCriterionPartialIntersectionMoreRelevant) {
+        std::cout << "Note: using '--spatial-test intersects' would bring "
+                     "more relevant results."
+                  << std::endl;
     }
     if (summary) {
         for (const auto &op : list) {
-- 
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