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pure Python coordinate conversions, following convention of several popular Matlab routines.

Project description

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# Python 3-D coordinate conversions

3-D geographic coordinate conversions, with API similar to popular $1000 Matlab Mapping Toolbox routines for:

* Python
* [Matlab, GNU Octave](
* [modern Fortran](

PyMap3D is intended for non-interactive use on massively parallel (HPC) and embedded systems.
Includes some relevant
[Vallado algorithms](

[API docs](

## Prerequisites

* Python ≥ 3.5 or PyPy3

References to AstroPy are optional, algorithms from Vallado and Meeus are used if AstroPy is not present.

## Install

pip install pymap3d

or for the latest development code:
git clone
cd pymap3d
pip install -e .

One can verify Python functionality after installation by:
pip install -e .[tests]
pytest -rsv

## Usage

Where consistent with the definition of the functions, all arguments may
be arbitrarily shaped (scalar, N-D array).

import pymap3d as pm

x,y,z = pm.geodetic2ecef(lat,lon,alt)

az,el,range = pm.geodetic2aer(lat, lon, alt, observer_lat, observer_lon, 0)

[argument unpacking](
can be used for compact function arguments with scalars or arbitrarily
shaped N-D arrays:

aer = (az,el,slantrange)
obslla = (obs_lat,obs_lon,obs_alt)

lla = pm.aer2geodetic(*aer,*obslla)

where tuple `lla` is comprised of scalar or N-D arrays `(lat,lon,alt)`.

### Functions

Popular mapping toolbox functions ported to Python include the
following, where the source coordinate system (before the "2") is
converted to the desired coordinate system:

aer2ecef aer2enu aer2geodetic aer2ned
ecef2aer ecef2enu ecef2enuv ecef2geodetic ecef2ned ecef2nedv
ecef2eci eci2ecef eci2aer aer2eci
enu2aer enu2ecef enu2geodetic
geodetic2aer geodetic2ecef geodetic2enu geodetic2ned
ned2aer ned2ecef ned2geodetic
azel2radec radec2azel
vreckon vdist

Additional functions:

`loxodrome_inverse`: rhumb line distance and azimuth between ellipsoid points (lat,lon) akin to Matlab `distance('rh', ...)` and `azimuth('rh', ...)`


- [AER: Azimuth, Elevation, Range](
- [ECEF: Earth-centered, Earth-fixed](
- [ECI: Earth-centered Inertial](
- [ENU: East North Up](
- [NED: North East Down](
- [radec: right ascension, declination](

### Caveats

* Atmospheric effects neglected in all functions not invoking AstroPy.
Would need to update code to add these input parameters (just start a GitHub Issue to request).
* Planetary perturbations and nutation etc. not fully considered.

## Notes

As compared to [PyProj](

- PyMap3D does not require anything beyond pure Python + Numpy.
- PyMap3D API is similar to Matlab Mapping Toolbox, while PyProj's interface is quite distinct
- PyMap3D intrinsically handles local coordinate systems such as ENU,
while for PyProj ENU requires some [additional
- PyProj is oriented towards points on the planet surface, while
PyMap3D handles points on or above the planet surface equally well,
particularly important for airborne vehicles and remote sensing.

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