7f271988-d7cd-5488-9af5-e3a981f97d52 urn:uuid en UTF-8 nonGeographicDataset nonGeographicDataset 2025-09-20T19:52:53 creation ISO 19115 2016 Python workflow for seamlessly merging high resolution digital elevation models 7f271988-d7cd-5488-9af5-e3a981f97d52 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. Workflow/1_Preprocessing/01_Preprocessing_1a_Create_FABDEM_vrt.html documentDigital HTML Workflow/1_Preprocessing/01_Preprocessing_1a_Create_FABDEM_vrt.ipynb documentDigital binary/octet-stream Workflow/1_Preprocessing/02_Preprocessing_1b_Extract_metadata_steps.html documentDigital HTML Workflow/1_Preprocessing/02_Preprocessing_1b_Extract_metadata_steps.ipynb documentDigital binary/octet-stream Workflow/1_Preprocessing/03_Preprocessing_1c_Vertical_adjustment_surfaces.html documentDigital HTML Workflow/1_Preprocessing/03_Preprocessing_1c_Vertical_adjustment_surfaces.ipynb documentDigital binary/octet-stream Workflow/1_Preprocessing/04_Preprocessing_2_Merge_and_reproject.html documentDigital HTML Workflow/1_Preprocessing/04_Preprocessing_2_Merge_and_reproject.ipynb documentDigital binary/octet-stream Workflow/1_Preprocessing/05_Preprocessing_3a_Create_stacked_DEM_and_index.html documentDigital HTML Workflow/1_Preprocessing/05_Preprocessing_3a_Create_stacked_DEM_and_index.ipynb documentDigital binary/octet-stream Workflow/1_Preprocessing/06_Preprocessing_3b_Create_hillshade.html documentDigital HTML Workflow/1_Preprocessing/06_Preprocessing_3b_Create_hillshade.ipynb documentDigital binary/octet-stream Workflow/1_Preprocessing/extract_metadata.py documentDigital binary/octet-stream Workflow/1_Preprocessing/vertical_transform.py documentDigital binary/octet-stream Workflow/1_Preprocessing/vrtMosaic.py documentDigital binary/octet-stream Workflow/2_DEM_Merging/07_DEM_merging_Gallant_method.html documentDigital HTML Workflow/2_DEM_Merging/07_DEM_merging_Gallant_method.ipynb documentDigital binary/octet-stream Workflow/2_DEM_Merging/dem_merging.py documentDigital binary/octet-stream Workflow/3_Postprocessing_Validation_and_COG_creation/08_Postprocessing_Corrections_reduced_resolution_DEMs.html documentDigital HTML Workflow/3_Postprocessing_Validation_and_COG_creation/08_Postprocessing_Corrections_reduced_resolution_DEMs.ipynb documentDigital binary/octet-stream Workflow/3_Postprocessing_Validation_and_COG_creation/09_Validation_Plots_stats_mergedDEM_and_stacked_elev.html documentDigital HTML Workflow/3_Postprocessing_Validation_and_COG_creation/09_Validation_Plots_stats_mergedDEM_and_stacked_elev.ipynb documentDigital binary/octet-stream Workflow/3_Postprocessing_Validation_and_COG_creation/10_Create_cloud_optimised_geotiffs.html documentDigital HTML Workflow/3_Postprocessing_Validation_and_COG_creation/10_Create_cloud_optimised_geotiffs.ipynb documentDigital binary/octet-stream Workflow/3_Postprocessing_Validation_and_COG_creation/plots_stats.py documentDigital binary/octet-stream Workflow/easienv.py documentDigital binary/octet-stream Workflow/LICENCE.txt documentDigital TXT Workflow/README Python workflow for seamlessly merging high resolution digital elevation models.txt documentDigital TXT Workflow/REQUIREMENTS.txt documentDigital TXT