hwrf.constants Namespace Reference

Constants used throughout the hwrf package. More...

Detailed Description

Constants used throughout the hwrf package.

This module contains various constants, including the Earth "radius" and unit conversions. Unit conversion constants are given as fractions.Fraction objects to allow the conversion to be exact.

Variables
list	__all__ = ['']
	ensures that "from hwrf.constants import *" does nothing
tuple	ft2m = fractions.Fraction(12*254,10000)
	"""US foot to meters conversion (exact)."""
int	m2ft = 1
	Meters to US foot conversion (exact). More...
tuple	nmi2km = fractions.Fraction(1852,1000)
	Nautical miles to kilometers conversion (exact). More...
int	km2nmi = 1
	Kilometers to nautical miles conversion (exact). More...
tuple	kts2mps = fractions.Fraction(1852,3600)
	Knots to meters per second conversion (exact). More...
int	mps2kts = 1
	Meters per second to knots conversion (exact). More...
float	Rpole = 6356752.3142
	EGM2008 Earth radius at the pole. More...
float	Requator = 6378137.0000
	EGM2008 Earth radius at the equator. More...
int	flattening = 1
	EGM2008 Earth flattening ratio. More...
float	REmean = 6371009.0
	Earth mean ellipsoid radius from IUGG 1980.
float	REauthalic = 6371007.2
	Earth authalic (equal surface area) radius from IUGG 1980.
float	REvolume = 6371000.8
	Earth equal volume radius from IUGG 1980.
float	RErectifying = 6367449.1
	Earth rectivying (equal circumference) radius from IUGG 1980.
tuple	Rearth = (REmean+REauthalic+REvolume)
	A compromise: the average of the mean ellipsoid radius, authalic radius and equal volume radius.

Variable Documentation

hwrf.constants.flattening = 1

EGM2008 Earth flattening ratio.

Definition at line 60 of file constants.py.

hwrf.constants.km2nmi = 1

Kilometers to nautical miles conversion (exact).

Definition at line 34 of file constants.py.

hwrf.constants.kts2mps = fractions.Fraction(1852,3600)

Knots to meters per second conversion (exact).

Definition at line 39 of file constants.py.

hwrf.constants.m2ft = 1

Meters to US foot conversion (exact).

Definition at line 24 of file constants.py.

hwrf.constants.mps2kts = 1

Meters per second to knots conversion (exact).

Definition at line 44 of file constants.py.

hwrf.constants.nmi2km = fractions.Fraction(1852,1000)

Nautical miles to kilometers conversion (exact).

Definition at line 29 of file constants.py.

hwrf.constants.Requator = 6378137.0000

EGM2008 Earth radius at the equator.

Definition at line 55 of file constants.py.

hwrf.constants.Rpole = 6356752.3142

EGM2008 Earth radius at the pole.

Definition at line 50 of file constants.py.