Function check_crs

hvplot/util.py:96–143

Checks if the crs represents a valid grid, projection or ESPG string. (Code copied and adapted from https://github.com/fmaussion/salem) Examples -------- >>> p = check_crs('epsg:26915 +units=m') >>> p.srs '+proj=utm +zone=15 +datum=NAD83 +units=m +no_defs' >>> p =

(crs)

def check_crs(crs):
    """
    Checks if the crs represents a valid grid, projection or ESPG string.

    (Code copied and adapted from https://github.com/fmaussion/salem)

    Examples
    --------
    >>> p = check_crs('epsg:26915 +units=m')
    >>> p.srs
    '+proj=utm +zone=15 +datum=NAD83 +units=m +no_defs'
    >>> p = check_crs('wrong')
    >>> p is None
    True

    Returns
    -------
    A valid crs if possible, otherwise None.
    """
    import pyproj

    try:
        crs_type = pyproj.crs.CRS
    except AttributeError:

        class Dummy:
            pass

        crs_type = Dummy

    if isinstance(crs, pyproj.Proj):
        out = crs
    elif isinstance(crs, crs_type):
        out = pyproj.Proj(crs.to_wkt(), preserve_units=True)
    elif isinstance(crs, dict) or isinstance(crs, str):
        if isinstance(crs, str):
            try:
                crs = pyproj.CRS.from_wkt(crs)
            except RuntimeError:
                # quick fix for https://github.com/pyproj4/pyproj/issues/345
                crs = crs.replace(' ', '').replace('+', ' +')
        try:
            out = pyproj.Proj(crs, preserve_units=True)
        except RuntimeError:
            out = None
    else:
        out = None
    return out


def proj_is_latlong(proj):