From ffc865a41aa540673eaedb2552565cf9f8d18679 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Tue, 29 Oct 2019 22:20:24 +0100
Subject: Vertical transformations: improve situations similar to transforming
 from 'NAVD88 (ftUS)' to X, where we now consider the available
 transformations from 'NAVD88' to X that might exist in the database

---
 src/iso19111/factory.cpp | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'src/iso19111/factory.cpp')

diff --git a/src/iso19111/factory.cpp b/src/iso19111/factory.cpp
index 993b4eeb..d3ea8f26 100644
--- a/src/iso19111/factory.cpp
+++ b/src/iso19111/factory.cpp
@@ -4602,6 +4602,30 @@ std::list<crs::GeodeticCRSNNPtr> AuthorityFactory::createGeodeticCRSFromDatum(
 
 // ---------------------------------------------------------------------------
 
+//! @cond Doxygen_Suppress
+std::list<crs::VerticalCRSNNPtr> AuthorityFactory::createVerticalCRSFromDatum(
+    const std::string &datum_auth_name, const std::string &datum_code) const {
+    std::string sql(
+        "SELECT auth_name, code FROM vertical_crs WHERE "
+        "datum_auth_name = ? AND datum_code = ? AND deprecated = 0");
+    ListOfParams params{datum_auth_name, datum_code};
+    if (d->hasAuthorityRestriction()) {
+        sql += " AND auth_name = ?";
+        params.emplace_back(d->authority());
+    }
+    auto sqlRes = d->run(sql, params);
+    std::list<crs::VerticalCRSNNPtr> res;
+    for (const auto &row : sqlRes) {
+        const auto &auth_name = row[0];
+        const auto &code = row[1];
+        res.emplace_back(d->createFactory(auth_name)->createVerticalCRS(code));
+    }
+    return res;
+}
+//! @endcond
+
+// ---------------------------------------------------------------------------
+
 //! @cond Doxygen_Suppress
 std::list<crs::GeodeticCRSNNPtr>
 AuthorityFactory::createGeodeticCRSFromEllipsoid(
-- 
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