pyrdnap 26.6.9

Pure Python RD NAP 2018 conversions

A pure Python implementation of the 2018 v220627 version of the Netherlands' RD (RijksDriehoeksmeting) and NAP (Normaal Amsterdams Peil) systems to convert GRS80 (ETRS89) geodetic lat-, longitudes and heights to local RD coordinates and NAP quasi-geoid-height and vice-versa.

PyRDNAP includes two transformer classes RDNAP2018v1 and RDNAP2018v2 implementing variant 1 respectively variant 2 of the RD NAP 2018 v220627 specification. Each class provides a forward method to convert from geodetic lat-, longitude and height to RDx, RDy and NAPh and a reverse method to convert RDx, RDy and NAPh to geodetic lat-, longitude and height.

NAPh is only interpolated for locations within the bounds RD region. Outside that region NAN is returned for NAPh or an RDNAPError is raised if so specified.

For further details see the documentation.

Note

RDNAP2018v1, RDNAP2018v2, PyRDNAP and pyrdnap have not been formally validated and are not certified to carry the trademark name RDNAPTRANS(tm).

Installation

To install pyrdnap, type python[3] -m pip install pyrdnap or python[3] -m easy_install pyrdnap in a terminal or command window.

Alternatively, download pyrdnap-yy.m.d.tar.gz from PyPI or GitHub, unzip the downloaded file, cd to directory pyrdnap-yy.m.d and type python[3] setup.py install.

To run the pyrdnap tests, type python[3] test/run.py or type python[3] test/unitTestSuite.py before or after installation.

Dependencies

Installation of Python package pygeodesy is required, version 26.5.26 or newer. Type python[3] -m pip install -r requirements.txt to install.

Documentation

In addition to the pyrdnap package, the pyrdnap distribution file contain the tests, the test results (on macOS only) and the complete documentation generated by Epydoc using command line: epydoc --html --no-private --no-source --name=pyrdnap --url=... -v pyrdnap.

Tests

The tests ran with Python 3.14.5, 2.7.18 and with PyPy 7.3.17 (Python 3.10.14), all with pygeodesy 26.5.26 and on macOS 26.5.1 Tahoe in 64-bit. The results of those tests are included in the distribution file.

Python 3.14.5 and PyPy 7.3.17 run on Apple M4 (arm64), natively. Python 2.7.18 runs on Intel (x86_64) or Intel emulation ("arm64_x86_64", see function pyrdnap.machine).

Test coverage has been measured with coverage 7.14.0 using Python 3.14.5. The complete coverage report in HTML and a PDF summary are included in the distribution file.

The tests also ran with Python 3.14.5 on Windows 2019Server and with Python 3.13.3 on Windows 11, both in 64-bit only.

Notes

All Python source code has been statically checked with Ruff using Python 3.13.12 and with PyChecker, PyFlakes, PyCodeStyle (formerly Pep8) and McCabe using Python 2.7.18, both in 64-bit on macOS 26.5.1 Tahoe only.

Last updated: June 09, 2026.

License

Copyright (C) 2026-2026 -- mrJean1 at Gmail -- All Rights Reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.