Method IsDynamic

ogr/ogrspatialreference.cpp:9572–9639

 */

bool OGRSpatialReference::IsDynamic() const

{
    TAKE_OPTIONAL_LOCK();
    bool isDynamic = false;
    d->refreshProjObj();
    d->demoteFromBoundCRS();
    auto ctxt = d->getPROJContext();
    PJ *horiz = nullptr;
    if (d->m_pjType == PJ_TYPE_COMPOUND_CRS)
    {
        horiz = proj_crs_get_sub_crs(ctxt, d->m_pj_crs, 0);
    }
    else if (d->m_pj_crs)
    {
        horiz = proj_clone(ctxt, d->m_pj_crs);
    }
    if (horiz && proj_get_type(horiz) == PJ_TYPE_BOUND_CRS)
    {
        auto baseCRS = proj_get_source_crs(ctxt, horiz);
        if (baseCRS)
        {
            proj_destroy(horiz);
            horiz = baseCRS;
        }
    }
    auto datum = horiz ? proj_crs_get_datum(ctxt, horiz) : nullptr;
    if (datum)
    {
        const auto type = proj_get_type(datum);
        isDynamic = type == PJ_TYPE_DYNAMIC_GEODETIC_REFERENCE_FRAME ||
                    type == PJ_TYPE_DYNAMIC_VERTICAL_REFERENCE_FRAME;
        if (!isDynamic)
        {
            const char *auth_name = proj_get_id_auth_name(datum, 0);
            const char *code = proj_get_id_code(datum, 0);
            if (auth_name && code && EQUAL(auth_name, "EPSG") &&
                EQUAL(code, "6326"))
            {
                isDynamic = true;
            }
        }
        proj_destroy(datum);
    }
#if PROJ_VERSION_MAJOR > 7 ||                                                  \
    (PROJ_VERSION_MAJOR == 7 && PROJ_VERSION_MINOR >= 2)
    else
    {
        auto ensemble =
            horiz ? proj_crs_get_datum_ensemble(ctxt, horiz) : nullptr;
        if (ensemble)
        {
            auto member = proj_datum_ensemble_get_member(ctxt, ensemble, 0);
            if (member)
            {
                const auto type = proj_get_type(member);
                isDynamic = type == PJ_TYPE_DYNAMIC_GEODETIC_REFERENCE_FRAME ||
                            type == PJ_TYPE_DYNAMIC_VERTICAL_REFERENCE_FRAME;