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Python workflow for seamlessly merging high resolution digital elevation models

Created 21/09/2025

Updated 21/09/2025

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This set of python scripts and Jupyter notebooks constitutes a workflow for seamlessly merging multiple digital elevation models (DEMs) to produce a hydrologically robust high-resolution DEM for large river basins. The DEM merging method is adapted from Gallant, J.C. (2019) Merging lidar with coarser DEMs for hydrodynamic modelling over large areas, in: El Sawah, S. (Ed.) MODSIM2019, 23rd International Congress on Modelling and Simulation. Presented at the 23rd International Congress on Modelling and Simulation (MODSIM2019), Modelling and Simulation Society of Australia and New Zealand. https://mssanz.org.au/modsim2019/K24/gallant.pdf The workflow runs on the CSIRO EASI platform https://research.csiro.au/easi/ and expects data stored in an AWS s3 bucket. Dask is used for parallel processing. The workflow was built to merge all the available high-resolution DEMs for the Murray Darling Basin, Australia, using 852 individual lidar and photogrammetry DEMs from the Geoscience Australia elevation data portal Elvis https://elevation.fsdf.org.au/ and the Forests and Buildings removed DEM (FABDEM; Hawker et al. 2022- https://doi.org/10.1088/1748-9326/ac4d4f), a bare-earth radar-derived, 1 arc-second resolution global elevation model. The seamless composite high-resolution Murray Darling Basin DEM datasets (5 m and 25 m resolutions) produced with this workflow can be downloaded here https://doi.org/10.25919/e1z5-mx88. The workflow is divided into three parts: 1) Preprocessing, 2) DEM merging and 3) Postprocessing and validation. The Jupyter notebooks in the workflow are also provided in html format for initial access to the content, without needing a python kernel.

Files and APIs

Additional Info

Field Value
Title Python workflow for seamlessly merging high resolution digital elevation models
Language English
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/7f271988-d7cd-5488-9af5-e3a981f97d52
Contact Point
CSIRO Data Access Portal
CSIROEnquiries@csiro.au
Reference Period 01/01/2000
Geospatial Coverage Australia
Data Portal CSIRO DAP

Data Source

This dataset was originally found on CSIRO DAP "Python workflow for seamlessly merging high resolution digital elevation models". Please visit the source to access the original metadata of the dataset:
https://data.csiro.au/collection/csiro:65029