Method metadataItem

ThirdParty/libproj/vtklibproj/src/grids.cpp:2523–2526

    }

    std::string metadataItem(const std::string &key,
                             int sample = -1) const override {
        return m_grid->metadataItem(key, sample);
    }

    void insertGrid(PJ_CONTEXT *ctx,
                    std::unique_ptr<GTiffGenericGrid> &&subgrid);