Maps of iron oxides and the color of Australian soil
Iron (Fe) oxide mineralogy in most Australian soils is poorly characterized, even though Fe oxides play an important role in soil function. Fe oxides reflect the conditions of pH, redox potential, moisture, and temperature in the soil environment. The strong pigmenting effect of Fe oxides gives most soils their color, which is largely a reflection of the soil’s Fe mineralogy. Visible-near-infrared (vis-NIR) spectroscopy can be used to identify and measure the abundance of certain Fe oxides in soil, and the visible range can be used to derive tristimuli soil color information. We measured the spectra of 4606 surface soil samples from across Australia using a vis-NIR spectrometer with a wavelength range of 350-2500 nm. We determined the Fe oxide abundance for each sample using the diagnostic absorption features of hematite (near 880 nm) and goethite (near 920 nm) and derived a normalized iron oxide difference index (NIODI) to better discriminate between them. The NIODI was generalized across Australia with its spatial uncertainty using sequential indicator simulation, which resulted in a map of the probability of the occurrence of hematite and goethite. We also derived soil RGB color from the spectra and mapped its distribution and uncertainty across the country using sequential Gaussian simulations. The simulated RGB color values were made into a composite true color image and were also converted to Munsell hue, value, and chroma. These color maps were compared to the map of the NIODI, and both were used to interpret our results. The maps were validated by randomly splitting the data into training and test data sets, as well as by comparing our results to existing studies on the distribution of Fe oxides in Australian soils.
Attributes:
Units of measurement:
1. Munsell Hue;
2. Munsell Chroma;
3. Munsell value;
4. NIODI;
5. NIODI uncertainty.
For details please see Viscarra Rossel et al. (2010).
Data Type: Float Grid.
Map projection: Lambert Conformal Conic.
Datum: GDA94.
Map units: Decimal degrees.
Resolution: 10,000 metres.
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Simple
Identification info
- Date (Creation)
- 2015-08-28
- Date (Publication)
- 2015-08-28
- Date (Revision)
- 2015-08-28
- Edition
- v1
Publisher
Author
Author
Author
Author
Identifier
- Keywords (Discipline)
-
- TERN_Soils
- TERN_Soils_DSM
- hematite
- goethite
- soil color
- soil colour
- visible-near-infrared reflectance
- soil mapping
- geostatistical simulations
- ANZSRC Fields of Research
Extent
Resource constraints
- Use limitation
- CSIRO Data Licence
- Title
- CSIRO Data Licence
- Alternate title
- CSIRO
- Access constraints
- License
- Use constraints
- Other restrictions
- Other constraints
- Data is accessible online and may be reused in accordance with licence conditions
Resource constraints
- Classification
- Unclassified
- Credit
- All Rights (including copyright) CSIRO Australia 2014.
- Title
- Viscarra Rossel, R. A., E. N. Bui, P. de Caritat, and N. J. McKenzie (2010), Mapping iron oxides and the color of Australian soil using visible-near-infrared reflectance spectra, J. Geophys. Res., 115, F04031, doi:10.1029/2009JF001645.
- Website
-
Viscarra Rossel, R. A., E. N. Bui, P. de Caritat, and N. J. McKenzie (2010), Mapping iron oxides and the color of Australian soil using visible-near-infrared reflectance spectra, J. Geophys. Res., 115, F04031, doi:10.1029/2009JF001645.
Viscarra Rossel, R. A., E. N. Bui, P. de Caritat, and N. J. McKenzie (2010), Mapping iron oxides and the color of Australian soil using visible-near-infrared reflectance spectra, J. Geophys. Res., 115, F04031, doi:10.1029/2009JF001645.
- Title
- Browse all Soil and Landscape Grid of Australia collections
- Website
-
Browse all Soil and Landscape Grid of Australia collections
Browse all Soil and Landscape Grid of Australia collections
- Title
- Browse all Soil and Landscape Grid of Australia Digital Soil Property Maps
- Website
-
Browse all Soil and Landscape Grid of Australia Digital Soil Property Maps
Browse all Soil and Landscape Grid of Australia Digital Soil Property Maps
Distribution Information
Distributor
Distributor
- Distribution format
-
- OnLine resource
- http://hdl.handle.net/102.100.100/22999?index=1
Reference System Information
- Reference system identifier
- EPSG/EPSG:4326
- Reference system type
- Geodetic Geographic 2D
Metadata
- Metadata identifier
-
urn:uuid/86743bad-72e0-5030-a351-4be4830155e3
- Title
- TERN GeoNetwork UUID - Commonwealth Scientific and Industrial Research Organisation
- Language
- English
- Character encoding
- UTF8
Point of contact
Type of resource
- Resource scope
- Dataset
- Metadata linkage
-
https://geonetwork.tern.org.au/geonetwork/srv/eng/catalog.search#/metadata/86743bad-72e0-5030-a351-4be4830155e3
Point of truth URL of this metadata record
- Date info (Creation)
- 2016-04-11T14:23:03.926+10:00
Metadata standard
- Title
- ISO 19115-1:2014/AMD 1:2018 Geographic information - Metadata - Fundamentals
- Edition
- 1
Metadata standard
- Title
- ISO/TS 19115-3:2016
- Edition
- 1.0
Metadata standard
- Title
- ISO/TS 19157-2:2016
- Edition
- 1.0
- Title
- Terrestrial Ecosystem Research Network (TERN) Metadata Profile of ISO 19115-3:2016 and ISO 19157-2:2016
- Date (published)
- 2021
- Edition
- 1.0