WKT1 ESRI export: fix wrong mapping of Lambert Cylindrical Equal Area…

… to Behrmann
OSGeo · Nov 25, 2024 · 16eb426 · 16eb426
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diff --git a/scripts/build_esri_projection_mapping.py b/scripts/build_esri_projection_mapping.py
@@ -34,6 +34,15 @@
 # Map methods from pe_list_projection.csv to WKT2 naming
 
 config_str = """
+
+- Equidistant_Cylindrical:
+    WKT2_name: EPSG_NAME_METHOD_EQUIDISTANT_CYLINDRICAL
+    Params:
+        - False_Easting: EPSG_NAME_PARAMETER_FALSE_EASTING
+        - False_Northing: EPSG_NAME_PARAMETER_FALSE_NORTHING
+        - Central_Meridian: EPSG_NAME_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN
+        - Standard_Parallel_1: EPSG_NAME_PARAMETER_LATITUDE_1ST_STD_PARALLEL
+
 - Plate_Carree:
     WKT2_name:
         - EPSG_NAME_METHOD_EQUIDISTANT_CYLINDRICAL
@@ -45,14 +54,6 @@
     Cond:
         - EPSG_NAME_PARAMETER_LATITUDE_1ST_STD_PARALLEL = 0
 
-- Equidistant_Cylindrical:
-    WKT2_name: EPSG_NAME_METHOD_EQUIDISTANT_CYLINDRICAL
-    Params:
-        - False_Easting: EPSG_NAME_PARAMETER_FALSE_EASTING
-        - False_Northing: EPSG_NAME_PARAMETER_FALSE_NORTHING
-        - Central_Meridian: EPSG_NAME_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN
-        - Standard_Parallel_1: EPSG_NAME_PARAMETER_LATITUDE_1ST_STD_PARALLEL
-
 - Miller_Cylindrical:
     WKT2_name: PROJ_WKT2_NAME_METHOD_MILLER_CYLINDRICAL
     Params:
@@ -168,18 +169,6 @@
         - False_Northing: EPSG_NAME_PARAMETER_FALSE_NORTHING
         - Central_Meridian: EPSG_NAME_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN
 
-- Behrmann:
-    WKT2_name: EPSG_NAME_METHOD_LAMBERT_CYLINDRICAL_EQUAL_AREA
-    Params:
-        - False_Easting: EPSG_NAME_PARAMETER_FALSE_EASTING
-        - False_Northing: EPSG_NAME_PARAMETER_FALSE_NORTHING
-        - Central_Meridian:
-            Name: EPSG_NAME_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN
-            Default: 0.0
-        - Standard_Parallel_1:
-            Name: EPSG_NAME_PARAMETER_LATITUDE_1ST_STD_PARALLEL
-            Default: 30.0
-
 - Winkel_I:
     WKT2_name: "Winkel I"
     Params:
@@ -365,6 +354,20 @@
         - Central_Meridian: EPSG_NAME_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN
         - Standard_Parallel_1: EPSG_NAME_PARAMETER_LATITUDE_1ST_STD_PARALLEL
 
+- Behrmann:
+    WKT2_name: EPSG_NAME_METHOD_LAMBERT_CYLINDRICAL_EQUAL_AREA
+    Params:
+        - False_Easting: EPSG_NAME_PARAMETER_FALSE_EASTING
+        - False_Northing: EPSG_NAME_PARAMETER_FALSE_NORTHING
+        - Central_Meridian:
+            Name: EPSG_NAME_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN
+            Default: 0.0
+        - Standard_Parallel_1:
+            Name: EPSG_NAME_PARAMETER_LATITUDE_1ST_STD_PARALLEL
+            Default: 30.0
+    Cond:
+        - EPSG_NAME_PARAMETER_LATITUDE_1ST_STD_PARALLEL = 30
+
 # No example in pe_list_projection.csv: temptative mapping !
 - Hotine_Oblique_Mercator_Two_Point_Center:
     WKT2_name: PROJ_WKT2_NAME_METHOD_HOTINE_OBLIQUE_MERCATOR_TWO_POINT_NATURAL_ORIGIN

diff --git a/src/iso19111/operation/conversion.cpp b/src/iso19111/operation/conversion.cpp
@@ -3206,6 +3206,16 @@ static void getESRIMethodNameAndParams(const Conversion *conv,
             } else {
                 esriMethodName = "Stereographic_South_Pole";
             }
+        } else if (esriMapping->epsg_code ==
+                   EPSG_CODE_METHOD_LAMBERT_CYLINDRICAL_EQUAL_AREA) {
+            if (std::abs(conv->parameterValueNumeric(
+                             EPSG_CODE_PARAMETER_LATITUDE_1ST_STD_PARALLEL,
+                             common::UnitOfMeasure::DEGREE) -
+                         30.0) < 1e-10) {
+                esriMethodName = "Behrmann";
+            } else {
+                esriMethodName = "Cylindrical_Equal_Area";
+            }
         }
     }
 }

diff --git a/src/iso19111/operation/esriparammappings.cpp b/src/iso19111/operation/esriparammappings.cpp
@@ -46,24 +46,24 @@ namespace operation {
 
 //! @cond Doxygen_Suppress
 
-const ESRIParamMapping paramsESRI_Plate_Carree[] = {
+const ESRIParamMapping paramsESRI_Equidistant_Cylindrical[] = {
     {"False_Easting", EPSG_NAME_PARAMETER_FALSE_EASTING,
      EPSG_CODE_PARAMETER_FALSE_EASTING, "0.0", false},
     {"False_Northing", EPSG_NAME_PARAMETER_FALSE_NORTHING,
      EPSG_CODE_PARAMETER_FALSE_NORTHING, "0.0", false},
     {"Central_Meridian", EPSG_NAME_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN,
      EPSG_CODE_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN, "0.0", false},
+    {"Standard_Parallel_1", EPSG_NAME_PARAMETER_LATITUDE_1ST_STD_PARALLEL,
+     EPSG_CODE_PARAMETER_LATITUDE_1ST_STD_PARALLEL, "0.0", false},
     {nullptr, nullptr, 0, "0.0", false}};
 
-const ESRIParamMapping paramsESRI_Equidistant_Cylindrical[] = {
+const ESRIParamMapping paramsESRI_Plate_Carree[] = {
     {"False_Easting", EPSG_NAME_PARAMETER_FALSE_EASTING,
      EPSG_CODE_PARAMETER_FALSE_EASTING, "0.0", false},
     {"False_Northing", EPSG_NAME_PARAMETER_FALSE_NORTHING,
      EPSG_CODE_PARAMETER_FALSE_NORTHING, "0.0", false},
     {"Central_Meridian", EPSG_NAME_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN,
      EPSG_CODE_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN, "0.0", false},
-    {"Standard_Parallel_1", EPSG_NAME_PARAMETER_LATITUDE_1ST_STD_PARALLEL,
-     EPSG_CODE_PARAMETER_LATITUDE_1ST_STD_PARALLEL, "0.0", false},
     {nullptr, nullptr, 0, "0.0", false}};
 
 static const ESRIParamMapping paramsESRI_Miller_Cylindrical[] = {
@@ -221,17 +221,6 @@ static const ESRIParamMapping paramsESRI_Gall_Stereographic[] = {
      EPSG_CODE_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN, "0.0", false},
     {nullptr, nullptr, 0, "0.0", false}};
 
-static const ESRIParamMapping paramsESRI_Behrmann[] = {
-    {"False_Easting", EPSG_NAME_PARAMETER_FALSE_EASTING,
-     EPSG_CODE_PARAMETER_FALSE_EASTING, "0.0", false},
-    {"False_Northing", EPSG_NAME_PARAMETER_FALSE_NORTHING,
-     EPSG_CODE_PARAMETER_FALSE_NORTHING, "0.0", false},
-    {"Central_Meridian", EPSG_NAME_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN,
-     EPSG_CODE_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN, "0.0", true},
-    {"Standard_Parallel_1", EPSG_NAME_PARAMETER_LATITUDE_1ST_STD_PARALLEL,
-     EPSG_CODE_PARAMETER_LATITUDE_1ST_STD_PARALLEL, "30.0", true},
-    {nullptr, nullptr, 0, "0.0", false}};
-
 static const ESRIParamMapping paramsESRI_Winkel_I[] = {
     {"False_Easting", EPSG_NAME_PARAMETER_FALSE_EASTING,
      EPSG_CODE_PARAMETER_FALSE_EASTING, "0.0", false},
@@ -487,6 +476,17 @@ static const ESRIParamMapping paramsESRI_Cylindrical_Equal_Area[] = {
      EPSG_CODE_PARAMETER_LATITUDE_1ST_STD_PARALLEL, "0.0", false},
     {nullptr, nullptr, 0, "0.0", false}};
 
+static const ESRIParamMapping paramsESRI_Behrmann[] = {
+    {"False_Easting", EPSG_NAME_PARAMETER_FALSE_EASTING,
+     EPSG_CODE_PARAMETER_FALSE_EASTING, "0.0", false},
+    {"False_Northing", EPSG_NAME_PARAMETER_FALSE_NORTHING,
+     EPSG_CODE_PARAMETER_FALSE_NORTHING, "0.0", false},
+    {"Central_Meridian", EPSG_NAME_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN,
+     EPSG_CODE_PARAMETER_LONGITUDE_OF_NATURAL_ORIGIN, "0.0", true},
+    {"Standard_Parallel_1", EPSG_NAME_PARAMETER_LATITUDE_1ST_STD_PARALLEL,
+     EPSG_CODE_PARAMETER_LATITUDE_1ST_STD_PARALLEL, "30.0", true},
+    {nullptr, nullptr, 0, "0.0", false}};
+
 static const ESRIParamMapping
     paramsESRI_Hotine_Oblique_Mercator_Two_Point_Center[] = {
         {"False_Easting", EPSG_NAME_PARAMETER_EASTING_PROJECTION_CENTRE,
@@ -990,14 +990,14 @@ static const ESRIParamMapping paramsESRI_Peirce_Quincuncial_alt2[] = {
     {nullptr, nullptr, 0, "0.0", false}};
 
 static const ESRIMethodMapping esriMappings[] = {
+    {"Equidistant_Cylindrical", EPSG_NAME_METHOD_EQUIDISTANT_CYLINDRICAL,
+     EPSG_CODE_METHOD_EQUIDISTANT_CYLINDRICAL,
+     paramsESRI_Equidistant_Cylindrical},
     {"Plate_Carree", EPSG_NAME_METHOD_EQUIDISTANT_CYLINDRICAL,
      EPSG_CODE_METHOD_EQUIDISTANT_CYLINDRICAL, paramsESRI_Plate_Carree},
     {"Plate_Carree", EPSG_NAME_METHOD_EQUIDISTANT_CYLINDRICAL_SPHERICAL,
      EPSG_CODE_METHOD_EQUIDISTANT_CYLINDRICAL_SPHERICAL,
      paramsESRI_Plate_Carree},
-    {"Equidistant_Cylindrical", EPSG_NAME_METHOD_EQUIDISTANT_CYLINDRICAL,
-     EPSG_CODE_METHOD_EQUIDISTANT_CYLINDRICAL,
-     paramsESRI_Equidistant_Cylindrical},
     {"Miller_Cylindrical", PROJ_WKT2_NAME_METHOD_MILLER_CYLINDRICAL, 0,
      paramsESRI_Miller_Cylindrical},
     {"Mercator", EPSG_NAME_METHOD_MERCATOR_VARIANT_B,
@@ -1021,8 +1021,6 @@ static const ESRIMethodMapping esriMappings[] = {
     {"Eckert_VI", PROJ_WKT2_NAME_METHOD_ECKERT_VI, 0, paramsESRI_Eckert_VI},
     {"Gall_Stereographic", PROJ_WKT2_NAME_METHOD_GALL_STEREOGRAPHIC, 0,
      paramsESRI_Gall_Stereographic},
-    {"Behrmann", EPSG_NAME_METHOD_LAMBERT_CYLINDRICAL_EQUAL_AREA,
-     EPSG_CODE_METHOD_LAMBERT_CYLINDRICAL_EQUAL_AREA, paramsESRI_Behrmann},
     {"Winkel_I", "Winkel I", 0, paramsESRI_Winkel_I},
     {"Winkel_II", "Winkel II", 0, paramsESRI_Winkel_II},
     {"Lambert_Conformal_Conic", EPSG_NAME_METHOD_LAMBERT_CONIC_CONFORMAL_1SP,
@@ -1070,6 +1068,8 @@ static const ESRIMethodMapping esriMappings[] = {
     {"Cylindrical_Equal_Area", EPSG_NAME_METHOD_LAMBERT_CYLINDRICAL_EQUAL_AREA,
      EPSG_CODE_METHOD_LAMBERT_CYLINDRICAL_EQUAL_AREA,
      paramsESRI_Cylindrical_Equal_Area},
+    {"Behrmann", EPSG_NAME_METHOD_LAMBERT_CYLINDRICAL_EQUAL_AREA,
+     EPSG_CODE_METHOD_LAMBERT_CYLINDRICAL_EQUAL_AREA, paramsESRI_Behrmann},
     {"Hotine_Oblique_Mercator_Two_Point_Center",
      PROJ_WKT2_NAME_METHOD_HOTINE_OBLIQUE_MERCATOR_TWO_POINT_NATURAL_ORIGIN, 0,
      paramsESRI_Hotine_Oblique_Mercator_Two_Point_Center},

diff --git a/test/unit/test_io.cpp b/test/unit/test_io.cpp
@@ -7791,10 +7791,15 @@ static const struct {
 TEST(wkt_parse, esri_projcs) {
 
     for (const auto &projDef : esriProjDefs) {
-        std::string wkt("PROJCS[\"unnamed\",GEOGCS[\"unnamed\","
-                        "DATUM[\"unnamed\",SPHEROID[\"unnamed\","
-                        "6378137.0,298.257223563]],PRIMEM[\"Greenwich\",0.0],"
-                        "UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"");
+        std::string wkt("PROJCS[\"");
+        if (strcmp(projDef.esriProjectionName, "Plate_Carree") == 0)
+            wkt += "Plate Carree";
+        else
+            wkt += "unnamed";
+        wkt += "\",GEOGCS[\"unnamed\","
+               "DATUM[\"unnamed\",SPHEROID[\"unnamed\","
+               "6378137.0,298.257223563]],PRIMEM[\"Greenwich\",0.0],"
+               "UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"";
         wkt += projDef.esriProjectionName;
         wkt += "\"],";
         for (const auto &param : projDef.esriParams) {
@@ -7829,6 +7834,28 @@ TEST(wkt_parse, esri_projcs) {
                 EXPECT_EQ(measure.value(), projDef.wkt2Params[i].second) << wkt;
             }
         }
+
+        auto wkt1Esri = crs->exportToWKT(
+            WKTFormatter::create(WKTFormatter::Convention::WKT1_ESRI).get());
+        const char *expectedESRIProjectionName = projDef.esriProjectionName;
+        // Not totally sure about the below exceptions. They just capture the
+        // current state of things.
+        if (strcmp(projDef.esriProjectionName, "Transverse_Mercator_Complex") ==
+            0)
+            expectedESRIProjectionName = "Transverse_Mercator";
+        else if (strcmp(projDef.esriProjectionName,
+                        "Equidistant_Cylindrical_Ellipsoidal") == 0)
+            expectedESRIProjectionName = "Equidistant_Cylindrical";
+        else if (strcmp(projDef.esriProjectionName, "Mercator_Variant_C") == 0)
+            expectedESRIProjectionName = "Mercator";
+        else if (strcmp(projDef.esriProjectionName, "Gnomonic_Ellipsoidal") ==
+                 0)
+            expectedESRIProjectionName = "Gnomonic";
+        EXPECT_TRUE(wkt1Esri.find(std::string("PROJECTION[\"")
+                                      .append(expectedESRIProjectionName)) !=
+                    std::string::npos)
+            << "input: " << wkt << std::endl
+            << "output: " << wkt1Esri;
     }
 }