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Relative Spectral Mixture Analysis (RSMA) - MODIS, Australia coverage

Created 25/06/2025

Updated 10/01/2026

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RSMA measures change in the relative contributions of photosynthetic vegetation (PV, or GV green vegetation), non-photosynthetic vegetation (NPV) and soil reflectance compared to a baseline date. These spectral changes correspond to changes in fractional cover relative to the baseline date. Full details on the RSMA method are presented in Okin (2007). One of the key advantages of the RSMA, its insensitivity to changes in soil spectra, is a result of the fact that it does not require us to know the soil reflectance profile for a region. This strength is also the cause of a major weakness in RSMA. Since the measure is relative to a baseline date, and the absolute cover levels for every pixel are unknown at the baseline, the RSMA does not convey the absolute cover levels at any other point in time. However, if the absolute cover levels are known at any point in time, it is theoretically possible to convert the RSMA to absolute relative spectral mixture analysis (ARSMA).

As with all products derived from passive remote sensing imagery, this product represents the world as seen from above. Therefore, the cover recorded by this product represent what would be observed from a bird's-eye-view. Therefore, dense canopy may prevent observation of significant soil exposure.

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Additional Info

Field Value
Title Relative Spectral Mixture Analysis (RSMA) - MODIS, Australia coverage
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/0d724a98-0c8b-4a4b-b055-af3c7981ecd2
Contact Point
Terrestrial Ecosystem Research Network's Data Discovery
kenneth.clarke@adelaide.edu.au
Reference Period 18/02/2000 - 09/11/2011
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        110.0,
        -45.0
      ],
      [
        155.0,
        -45.0
      ],
      [
        155.0,
        -10.0
      ],
      [
        110.0,
        -10.0
      ],
      [
        110.0,
        -45.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Terrestrial Ecosystem Research Network

Data Source

This dataset was originally found on Terrestrial Ecosystem Research Network "Relative Spectral Mixture Analysis (RSMA) - MODIS, Australia coverage". Please visit the source to access the original metadata of the dataset:
https://geonetwork.tern.org.au/geonetwork/srv/eng/csw/dataset/relative-spectral-mixture-analysis-rsma-modis-australia-coverage