Function ll_points

src/wrf/util.py:3857–3888

Return the lower left latitude and longitude point(s). This functions extracts the lower left corner points and returns the result as either a single :class:`CoordPair` object, or a list of :class:`CoordPair` objects. This is primarily used for testing or constructing the corner po

(lat, lon)

def ll_points(lat, lon):
    """Return the lower left latitude and longitude point(s).

    This functions extracts the lower left corner points and returns the result
    as either a single :class:`CoordPair` object, or a list of
    :class:`CoordPair` objects.

    This is primarily used for testing or constructing the corner point objects
    from the XLAT and XLONG variables.

    Args:

        lat (:class:`xarray.DataArray` or :class:`numpy.ndarray`): The latitude
            array. Must be at least two dimensions.

        lon (:class:`xarray.DataArray` or :class:`numpy.ndarray`): The
            longitude array. Must be at least two dimensions.

    Returns:

        :class:`wrf.CoordPair` or :obj:`list`: A single :class:`wrf.CoordPair`
        object or a list of :class:`wrf.CoordPair` objects.

    """
    latvals = np.ravel(to_np(lat)[..., 0, 0])
    lonvals = np.ravel(to_np(lon)[..., 0, 0])

    if latvals.shape[0] == 1:
        return CoordPair(lat=float(latvals), lon=float(lonvals))
    else:
        return [CoordPair(lat=latvals[i], lon=lonvals[i])
                for i in py3range(latvals.shape[0])]


def pairs_to_latlon(pairs):