Authors / CoAuthors
Abstract
A `weighted geometric median' approach has been used to estimate the median surface reflectance of the barest state (i.e., least vegetation) observed through Landsat-8 Operational Land Image (OLI) observations from 2013 to September 2018 to generate a six-band Landsat-8 Barest Earth pixel composite mosaic over the Australian continent. The bands include BLUE (0.452 - 0.512), GREEN (0.533 - 0.590), RED, (0.636 - 0.673) NIR (0.851 - 0.879), SWIR1 (1.566 - 1.651) and SWIR2 (2.107 - 2.294) wavelength regions. The weighted median approach is robust to outliers (such as cloud, shadows, saturation, corrupted pixels) and also maintains the relationship between all the spectral wavelengths in the spectra observed through time. The product reduces the influence of vegetation and allows for more direct mapping of soil and rock mineralogy. Reference: Dale Roberts, John Wilford, and Omar Ghattas (2018). Revealing the Australian Continent at its Barest, submitted. <b>Value: </b>Has broad application in mapping surface geochemistry and mineralogy of exposed soil and bedrock. Has applications in geological mapping and natural resource management including mapping of soil characteristics. <b>Scope: </b>Two enhanced bare earth products have been generated reflecting different Landsat satellites and acquisition periods. The first only uses Landsat 8 observations from 2013 to 2018. The second incorporates the full 30+ year archive combining Landsat 5, 7, and 8 from 1986 to 2018.
Product Type
collection
eCat Id
144632
Contact for the resource
Resource provider
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Point of contact
- Contact instructions
- MEG
Keywords
- theme.ANZRC Fields of Research.rdf
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- EARTH SCIENCES
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- HVC_144632
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- HVC - High Value Collection
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- DC2020
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- Remote sensing soil and bedrock
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- Mapping soil and bedrock
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- Landsat TM
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- Bare Earth
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- Soil Mineralogy
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- Rock Mineralogy
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- Landsat 8
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- Imagery Soil, Regolith and Geology
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- Published_External
Publication Date
2022-02-24T01:47:36
Creation Date
Security Constraints
Legal Constraints
Status
onGoing
Purpose
Has broad application in mapping surface geochemistry and mineralogy of exposed soil and bedrock. Has applications in geological mapping and natural resource management including mapping of soil characteristics.
Maintenance Information
annually
Topic Category
geoscientificInformation
Series Information
Lineage
<b>Source: </b>Landsat series satellites (5, 7 and 8) from the mid-80’s to the present day. Imagery computed by Geoscience Australia staff from Earth Observation (EO) data contained in other collections<br /> <br /> <b>Form: </b>Bare earth Landsat Images as geotifs for 6 bands covering the visible, near infrared and Shortwave infrared region <br /> <br /> This Collection record was created to enhance the discoverability and management of the individual products contained in the collection. See the individual eCat records for product specific lineage.
Parent Information
Extents
[-44.00, -9.00, 112.00, 154.00]
Reference System
Spatial Resolution
Service Information
Associations
Source Information