Add proj_create_derived_geographic_crs() and proj_create_conversion_pole_rotation_grib_convention() to address GRIB datasets using a pole rotation method

2 files changed, 30 insertions, 0 deletions

diff --git a/include/proj/coordinateoperation.hpp b/include/proj/coordinateoperation.hpp
index 1ced5333..e3e3ece3 100644
--- a/include/proj/coordinateoperation.hpp
+++ b/include/proj/coordinateoperation.hpp
@@ -607,6 +607,11 @@ class PROJ_GCC_DLL SingleOperation : virtual public CoordinateOperation {
                               const common::UnitOfMeasure &targetUnit) const
         noexcept;
 
+    PROJ_INTERNAL double
+    parameterValueNumeric(const char *param_name,
+                          const common::UnitOfMeasure &targetUnit) const
+        noexcept;
+
     PROJ_INTERNAL double parameterValueNumericAsSI(int epsg_code) const
         noexcept;
 
@@ -1319,6 +1324,12 @@ class PROJ_GCC_DLL Conversion : public SingleOperation {
                               const common::Length &falseEasting,
                               const common::Length &falseNorthing);
 
+    PROJ_DLL static ConversionNNPtr createPoleRotationGRIBConvention(
+        const util::PropertyMap &properties,
+        const common::Angle &southPoleLatInUnrotatedCRS,
+        const common::Angle &southPoleLongInUnrotatedCRS,
+        const common::Angle &axisRotation);
+
     PROJ_DLL static ConversionNNPtr
     createChangeVerticalUnit(const util::PropertyMap &properties,
                              const common::Scale &factor);
diff --git a/include/proj/internal/coordinateoperation_constants.hpp b/include/proj/internal/coordinateoperation_constants.hpp
index eb0bb8c5..533599a0 100644
--- a/include/proj/internal/coordinateoperation_constants.hpp
+++ b/include/proj/internal/coordinateoperation_constants.hpp
@@ -1150,6 +1150,22 @@ static const ParamMapping paramVerticalOffsetFile = {
 static const ParamMapping *const paramsVERTCON[] = {&paramVerticalOffsetFile,
                                                     nullptr};
 
+static const ParamMapping paramSouthPoleLatGRIB = {
+    PROJ_WKT2_NAME_PARAMETER_SOUTH_POLE_LATITUDE_GRIB_CONVENTION, 0, nullptr,
+    common::UnitOfMeasure::Type::ANGULAR, nullptr};
+
+static const ParamMapping paramSouthPoleLonGRIB = {
+    PROJ_WKT2_NAME_PARAMETER_SOUTH_POLE_LONGITUDE_GRIB_CONVENTION, 0, nullptr,
+    common::UnitOfMeasure::Type::ANGULAR, nullptr};
+
+static const ParamMapping paramAxisRotationGRIB = {
+    PROJ_WKT2_NAME_PARAMETER_AXIS_ROTATION_GRIB_CONVENTION, 0, nullptr,
+    common::UnitOfMeasure::Type::ANGULAR, nullptr};
+
+static const ParamMapping *const paramsPoleRotationGRIBConvention[] = {
+    &paramSouthPoleLatGRIB, &paramSouthPoleLonGRIB, &paramAxisRotationGRIB,
+    nullptr};
+
 static const MethodMapping otherMethodMappings[] = {
     {EPSG_NAME_METHOD_CHANGE_VERTICAL_UNIT,
      EPSG_CODE_METHOD_CHANGE_VERTICAL_UNIT, nullptr, nullptr, nullptr,
@@ -1172,6 +1188,9 @@ static const MethodMapping otherMethodMappings[] = {
      EPSG_CODE_METHOD_AFFINE_PARAMETRIC_TRANSFORMATION, nullptr, nullptr,
      nullptr, paramsAffineParametricTransformation},
 
+    {PROJ_WKT2_NAME_METHOD_POLE_ROTATION_GRIB_CONVENTION, 0, nullptr, nullptr,
+     nullptr, paramsPoleRotationGRIBConvention},
+
     {EPSG_NAME_METHOD_GEOCENTRIC_TRANSLATION_GEOCENTRIC,
      EPSG_CODE_METHOD_GEOCENTRIC_TRANSLATION_GEOCENTRIC, nullptr, nullptr,
      nullptr, paramsHelmert3},