Instructions to extract WA 20m TMI grid compilation in ERMapper (.ers) format: Download the file WA_20m_Mag_Merge_v1_2026_7z.bin Rename the downloaded file as WA_20m_Mag_Merge_v1_2026.7z 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_2026 (grid data) -- 31 GB WA_20m_Mag_Merge_v1_2026.ers (header) If you have any difficulties, email geophysics@dmpe.wa.gov.au
| File Name | Size (MB) | Date Modified |
| Image_file_in_JP2_format.zip | 847 | 28/07/2026 |
| Metadata_for_grids_and_images.zip | 1 | 28/07/2026 |
| WA_20m_Mag_Merge_v1_2026_7z.bin | 20,620 | 28/07/2026 |