From 17b5dbea2afebe6befb431ccd9e21c5d160c2942 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Sat, 21 Nov 2020 23:59:33 +0100
Subject: PROJJSON parsing: fix parsing of a Geodetic CRS with a DatumEnsemble,
 and fix parsing of a ProjectedCRS whose base is a Geocentric CRS

---
 src/iso19111/io.cpp | 33 ++++++++++++++++++++++++---------
 1 file changed, 24 insertions(+), 9 deletions(-)

(limited to 'src')

diff --git a/src/iso19111/io.cpp b/src/iso19111/io.cpp
index fff24e2f..f39a52a1 100644
--- a/src/iso19111/io.cpp
+++ b/src/iso19111/io.cpp
@@ -4976,6 +4976,10 @@ class JSONParser {
     TransformationNNPtr buildTransformation(const json &j);
     ConcatenatedOperationNNPtr buildConcatenatedOperation(const json &j);
 
+    void buildGeodeticDatumOrDatumEnsemble(const json &j,
+                                           GeodeticReferenceFramePtr &datum,
+                                           DatumEnsemblePtr &datumEnsemble);
+
     static util::optional<std::string> getAnchor(const json &j) {
         util::optional<std::string> anchor;
         if (j.contains("anchor")) {
@@ -5435,9 +5439,9 @@ BaseObjectNNPtr JSONParser::create(const json &j)
 
 // ---------------------------------------------------------------------------
 
-GeographicCRSNNPtr JSONParser::buildGeographicCRS(const json &j) {
-    GeodeticReferenceFramePtr datum;
-    DatumEnsemblePtr datumEnsemble;
+void JSONParser::buildGeodeticDatumOrDatumEnsemble(
+    const json &j, GeodeticReferenceFramePtr &datum,
+    DatumEnsemblePtr &datumEnsemble) {
     if (j.contains("datum")) {
         auto datumJ = getObject(j, "datum");
         datum = util::nn_dynamic_pointer_cast<GeodeticReferenceFrame>(
@@ -5450,6 +5454,14 @@ GeographicCRSNNPtr JSONParser::buildGeographicCRS(const json &j) {
         datumEnsemble =
             buildDatumEnsemble(getObject(j, "datum_ensemble")).as_nullable();
     }
+}
+
+// ---------------------------------------------------------------------------
+
+GeographicCRSNNPtr JSONParser::buildGeographicCRS(const json &j) {
+    GeodeticReferenceFramePtr datum;
+    DatumEnsemblePtr datumEnsemble;
+    buildGeodeticDatumOrDatumEnsemble(j, datum, datumEnsemble);
     auto csJ = getObject(j, "coordinate_system");
     auto ellipsoidalCS =
         util::nn_dynamic_pointer_cast<EllipsoidalCS>(buildCS(csJ));
@@ -5463,12 +5475,9 @@ GeographicCRSNNPtr JSONParser::buildGeographicCRS(const json &j) {
 // ---------------------------------------------------------------------------
 
 GeodeticCRSNNPtr JSONParser::buildGeodeticCRS(const json &j) {
-    auto datumJ = getObject(j, "datum");
-    if (getType(datumJ) != "GeodeticReferenceFrame") {
-        throw ParsingException("Unsupported type for datum.");
-    }
-    auto datum = buildGeodeticReferenceFrame(datumJ);
+    GeodeticReferenceFramePtr datum;
     DatumEnsemblePtr datumEnsemble;
+    buildGeodeticDatumOrDatumEnsemble(j, datum, datumEnsemble);
     auto csJ = getObject(j, "coordinate_system");
     auto cs = buildCS(csJ);
     auto props = buildProperties(j);
@@ -5503,7 +5512,13 @@ GeodeticCRSNNPtr JSONParser::buildGeodeticCRS(const json &j) {
 // ---------------------------------------------------------------------------
 
 ProjectedCRSNNPtr JSONParser::buildProjectedCRS(const json &j) {
-    auto baseCRS = buildGeographicCRS(getObject(j, "base_crs"));
+    auto jBaseCRS = getObject(j, "base_crs");
+    auto jBaseCS = getObject(jBaseCRS, "coordinate_system");
+    auto baseCS = buildCS(jBaseCS);
+    auto baseCRS = dynamic_cast<EllipsoidalCS *>(baseCS.get()) != nullptr
+                       ? util::nn_static_pointer_cast<GeodeticCRS>(
+                             buildGeographicCRS(jBaseCRS))
+                       : buildGeodeticCRS(jBaseCRS);
     auto csJ = getObject(j, "coordinate_system");
     auto cartesianCS = util::nn_dynamic_pointer_cast<CartesianCS>(buildCS(csJ));
     if (!cartesianCS) {
-- 
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