void linestring_add_location(const osmium::geom::Coordinates& xy) { xy.append_to_string(m_str, ' ', m_precision); m_str += ','; }
point_type make_point(const osmium::geom::Coordinates& xy) const { std::string str {"POINT"}; xy.append_to_string(str, '(', ' ', ')', m_precision); return str; }