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ellipsoid.py
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ellipsoid.py
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"""Minimal class for planetary ellipsoids"""
from __future__ import annotations
from math import sqrt
from dataclasses import dataclass, field
from typing import TypedDict
import sys
if sys.version_info < (3, 9):
from typing import Dict
else:
Dict = dict
class Model(TypedDict):
"""Ellipsoid parameters"""
name: str
a: float
b: float
@dataclass
class Ellipsoid:
"""
generate reference ellipsoid parameters
as everywhere else in pymap3d, distance units are METERS
Ellipsoid sources
-----------------
maupertuis, plessis, everest1830, everest1830m, everest1967,
airy, bessel, clarke1866, clarke1878, clarke1860, helmert, hayford,
international1924, krassovsky1940, wgs66, australian, international1967,
grs67, sa1969, wgs72, iers1989, iers2003:
- https://en.wikipedia.org/wiki/Earth_ellipsoid#Historical_Earth_ellipsoids
- https://en.wikibooks.org/wiki/PROJ.4#Spheroid
wgs84: https://en.wikipedia.org/wiki/World_Geodetic_System#WGS84
wgs84_mean: https://en.wikipedia.org/wiki/Earth_radius#Mean_radii
grs80: https://en.wikipedia.org/wiki/GRS_80
io: https://doi.org/10.1006/icar.1998.5987
pz90.11: https://structure.mil.ru/files/pz-90.pdf
gsk2011: https://racurs.ru/downloads/documentation/gost_r_32453-2017.pdf
mars: https://tharsis.gsfc.nasa.gov/geodesy.html
mercury, venus, moon, jupiter, saturn, uranus, neptune:
- https://nssdc.gsfc.nasa.gov/planetary/factsheet/index.html
feel free to suggest additional ellipsoids
"""
model: str # short name
name: str # name for printing
semimajor_axis: float
semiminor_axis: float
flattening: float
thirdflattening: float
eccentricity: float
models = field(default_factory=Dict[str, Model])
def __init__(
self, semimajor_axis: float, semiminor_axis: float, name: str = "", model: str = ""
):
"""
Ellipsoidal model of world
Parameters
----------
semimajor_axis : float
semimajor axis in meters
semiminor_axis : float
semiminor axis in meters
name: str, optional
Human-friendly name for the ellipsoid
model: str, optional
Short name for the ellipsoid
"""
self.flattening = (semimajor_axis - semiminor_axis) / semimajor_axis
assert self.flattening >= 0, "flattening must be >= 0"
self.thirdflattening = (semimajor_axis - semiminor_axis) / (semimajor_axis + semiminor_axis)
self.eccentricity = sqrt(2 * self.flattening - self.flattening**2)
self.name = name
self.model = model
self.semimajor_axis = semimajor_axis
self.semiminor_axis = semiminor_axis
models = {
# Earth ellipsoids
"maupertuis": {"name": "Maupertuis (1738)", "a": 6397300.0, "b": 6363806.283},
"plessis": {"name": "Plessis (1817)", "a": 6376523.0, "b": 6355862.9333},
"everest1830": {"name": "Everest (1830)", "a": 6377299.365, "b": 6356098.359},
"everest1830m": {
"name": "Everest 1830 Modified (1967)",
"a": 6377304.063,
"b": 6356103.039,
},
"everest1967": {
"name": "Everest 1830 (1967 Definition)",
"a": 6377298.556,
"b": 6356097.55,
},
"airy": {"name": "Airy (1830)", "a": 6377563.396, "b": 6356256.909},
"bessel": {"name": "Bessel (1841)", "a": 6377397.155, "b": 6356078.963},
"clarke1866": {"name": "Clarke (1866)", "a": 6378206.4, "b": 6356583.8},
"clarke1878": {"name": "Clarke (1878)", "a": 6378190.0, "b": 6356456.0},
"clarke1860": {"name": "Clarke (1880)", "a": 6378249.145, "b": 6356514.87},
"helmert": {"name": "Helmert (1906)", "a": 6378200.0, "b": 6356818.17},
"hayford": {"name": "Hayford (1910)", "a": 6378388.0, "b": 6356911.946},
"international1924": {"name": "International (1924)", "a": 6378388.0, "b": 6356911.946},
"krassovsky1940": {"name": "Krassovsky (1940)", "a": 6378245.0, "b": 6356863.019},
"wgs66": {"name": "WGS66 (1966)", "a": 6378145.0, "b": 6356759.769},
"australian": {"name": "Australian National (1966)", "a": 6378160.0, "b": 6356774.719},
"international1967": {
"name": "New International (1967)",
"a": 6378157.5,
"b": 6356772.2,
},
"grs67": {"name": "GRS-67 (1967)", "a": 6378160.0, "b": 6356774.516},
"sa1969": {"name": "South American (1969)", "a": 6378160.0, "b": 6356774.719},
"wgs72": {"name": "WGS-72 (1972)", "a": 6378135.0, "b": 6356750.52001609},
"grs80": {"name": "GRS-80 (1979)", "a": 6378137.0, "b": 6356752.31414036},
"wgs84": {"name": "WGS-84 (1984)", "a": 6378137.0, "b": 6356752.31424518},
"wgs84_mean": {"name": "WGS-84 (1984) Mean", "a": 6371008.7714, "b": 6371008.7714},
"iers1989": {"name": "IERS (1989)", "a": 6378136.0, "b": 6356751.302},
"pz90.11": {"name": "ПЗ-90 (2011)", "a": 6378136.0, "b": 6356751.3618},
"iers2003": {"name": "IERS (2003)", "a": 6378136.6, "b": 6356751.9},
"gsk2011": {"name": "ГСК (2011)", "a": 6378136.5, "b": 6356751.758},
# Other worlds
"mercury": {"name": "Mercury", "a": 2440500.0, "b": 2438300.0},
"venus": {"name": "Venus", "a": 6051800.0, "b": 6051800.0},
"moon": {"name": "Moon", "a": 1738100.0, "b": 1736000.0},
"mars": {"name": "Mars", "a": 3396900.0, "b": 3376097.80585952},
"jupyter": {"name": "Jupiter", "a": 71492000.0, "b": 66770054.3475922},
"io": {"name": "Io", "a": 1829.7, "b": 1815.8},
"saturn": {"name": "Saturn", "a": 60268000.0, "b": 54364301.5271271},
"uranus": {"name": "Uranus", "a": 25559000.0, "b": 24973000.0},
"neptune": {"name": "Neptune", "a": 24764000.0, "b": 24341000.0},
"pluto": {"name": "Pluto", "a": 1188000.0, "b": 1188000.0},
}
@classmethod
def from_name(cls, name: str) -> Ellipsoid:
"""Create an Ellipsoid from a name."""
return cls(
cls.models[name]["a"], cls.models[name]["b"], name=cls.models[name]["name"], model=name
)