Package pygeodesy :: Module gars

Module gars

Global Area Reference System (GARS) en-/decoding.

Class Garef and several functions to encode, decode and inspect GARS references.

Transcoded from Charles Karney's C++ class GARS.

See Also: Global Area Reference System and NGA (GARS).

Version: 24.08.13

Classes
	GARSError Global Area Reference System (GARS) encode, decode or other Garef issue.
	Garef Garef class, a named `str`.

Functions

decode3(garef, center=True, **name)
Decode a garef to lat-, longitude and precision.

encode(lat, lon, precision=1)
Encode a lat-/longitude as a garef of the given precision.

precision(res)
Determine the Garef precision to meet a required (geographic) resolution.

resolution(prec)
Determine the (geographic) resolution of a given Garef precision.

Variables
	__all__ = `_ALL_LAZY.gars`

Function Details

decode3 (garef, center=True, **name)

Decode a garef to lat-, longitude and precision.

Arguments:

garef - To be decoded (Garef or str).
center - If True, use the garef's center, otherwise the south-west, lower-left corner (bool).

Returns:

A LatLonPrec3Tuple

(lat, lon, 
          precision)

Raises:

GARSError - Invalid garef, INValid, non-alphanumeric or bad length garef.

encode (lat, lon, precision=1)

Encode a lat-/longitude as a garef of the given precision.

Arguments:

lat - Latitude (degrees).
lon - Longitude (degrees).
precision - Optional, the desired garef resolution and length (int 0..2).

Returns:

The garef (str).

Raises:

RangeError - Invalid lat or lon.
GARSError - Invalid precision.

Note: The garef length is precision + 5 and the garef resolution is 30′ for precision 0, 15′ for 1 and 5′ for 2, respectively.

precision (res)

Determine the Garef precision to meet a required (geographic) resolution.

Arguments:

res - The required resolution (degrees).

Returns:

The Garef precision (int 0..2).

Raises:

ValueError - Invalid res.

See Also: Function gars.encode for more precision details.

resolution (prec)

Determine the (geographic) resolution of a given Garef precision.

Arguments:

prec - The given precision (int).

Returns:

The (geographic) resolution (degrees).

Raises:

GARSError - Invalid prec.

See Also: Function gars.encode for more precision details.