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Transformez

Global vertical datum transformations, simplified.

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Transformez is a standalone Python engine for converting geospatial data between vertical datums (e.g., MLLW ↔ NAVD88 ↔ Ellipsoid).

Originally developed as the core transformation engine for the CUDEM project, Transformez has evolved into a standalone datum transformation suite.

❓ Why Transformez?

Vertical Datum transformations can cause a lot of confusion and headache when trying to process heterogeneous data from around the world into a single unified vertial reference.

Transformez simplifies this process!

📦 Installation

Install Transformez Install the transformez python package:

pip install transformez

Install HTDP The NGS Horizontal Time-Dependent Positioning (HTDP) software is required to perform highly accurate plate tectonic and frame transformations, you can install it with transformez!:

transformez htdp install

🐄 Quickstart

Generate a vertical shift grid for anywhere on Earth.

# Transform MLLW to WGS84 Ellipsoid in Norton Sound, AK

transformez grid -R -166/-164/63/64 -E 1s -I mllw -O 4979

Transform a raster directly. Transformez reads the bounds/resolution from the file.

transformez raster my_dem.tif -I mllw -O 5703

Integrate directly into your fetchez pipeline.

# Download GEBCO and shift EGM96 to WGS84 on the fly
fetchez gebco ... --hook transformez:datum_in=5773,datum_out=4979

📚 Documentation

Would you like to know more? Check out our Official Documentation to learn about:

  • The Python API: Build custom transformation into your apps.

⚖ License

This project is licensed under the MIT License - see the LICENSE file for details.

Copyright (c) 2010-2026 Regents of the University of Colorado

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  • Released:
Newer release available (0.5.7)

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Credits

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Author: Matthew Love

Maintainer: Matthew Love

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Data verified by PyPI on Jul 18, 2026
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License

MIT License

Requires

Python >=3.12

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Geospatial

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