94bfd63c-32db-4278-bf32-ecda27e4f443 urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-16T11:09:53 creation ISO 19115 2016 National ASTER Map Ferric oxide content 94bfd63c-32db-4278-bf32-ecda27e4f443 Band ratio: B4/B3 Blue is low abundance, Red is high abundance (1) Exposed iron ore (hematite-goethite). Use in combination with the "Opaques index" to help separate/map dark (a) surface lags (e.g. maghemite gravels) which can be misidentified in visible and false colour imagery; and (b) magnetite in BIF and/or bedded iron ore; and (3) Acid conditions: combine with FeOH Group content to help map jarosite which will have high values in both products. Mapping hematite versus goethite mapping is NOT easily achieved as ASTER's spectral bands were not designed to capture diagnostic iron oxide spectral behaviour. However, some information on visible colour relating in part to differences in hematite and/or goethite content can be obtained using a ratio of B2/B1 especially when this is masked using a B4/B3 to locate those pixels with sufficient iro oxide content. {"type": "Polygon", "coordinates": [[[111.5, -44.5], [155.0, -44.5], [155.0, -9.0], [111.5, -9.0], [111.5, -44.5]]]} 111.5 155.0 -44.5 -9.0 Earth Observations from Space Earth Sciences HVC_144626 NCI Published_External Remote Sensing Satellite imagery mineralogy Link to data - NCI documentDigital Link to data - NCI XML Link to Digital Earth Australia data page documentDigital Link to Digital Earth Australia data page audio/basic Link to NCI web service documentDigital Link to NCI web service HTML Unnamed resource documentDigital HTML