Instructions to extract WA 20m TMI grid compilation in ERMapper (.ers) format:
Download the file WA_20m_Mag_Merge_v1_2023_7z.bin
Rename the downloaded file as WA_20m_Mag_Merge_v1_2023.7z
Decompress this file with free, open-source application 7-Zip available from https://www.7-zip.org/.
The file contains:
WA_20m_Mag_Merge_v1_2023 (grid data) -- 31 GB
WA_20m_Mag_Merge_v1_2023.ers (header)
If you have any difficulties, email geophysics@dmirs.wa.gov.au
| File Name | Size (MB) | Date Modified |
| Image_file_in_JP2_format.zip | 345 | 26/11/2025 |
| Metadata_for_grids_and_images.zip | 1 | 17/11/2025 |
| WA_20m_Mag_Merge_v1_2023_7z.bin | 20,600 | 25/11/2025 |