Transformez
Global vertical datum transformations, simplified.
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.
📦 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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