Data Quality Assessment Scope
Product completeness is dependent on the completeness of the underlying MODIS product, MCD43A4. The MCD43A4 product uses 16 day compositing to minimise the chance of failing to acquire data due to cloud cover, and to maximise the quality of the recorded reflectance. However, frequent cloud cover still prevents acquisition of data, most notably in the far northern tropical areas of Western Australia, Northern Territory and Queensland in the rainy season (November to April), and in Tasmania in the winter (June to August).
The LCI is an index of total vegetation cover (green and non-photosynthetic vegetation ), and so is also an index of soil exposure. Importantly this means that it is unit-less, and is not intended to report absolute vegetation or soil fraction. It may be possible to calibrate the LCI to absolute fractions for a specific region, with appropriate field data, as was done in Clarke et al., (2011).
Data Quality Assessment Outcome
The LCI has been evaluated against two sets of South Australian field data; 1) field fractional cover (photosynthetic vegetation (PV), non-photosynthetic vegetation (NPV) and soil) measured at MODIS scale sites (15 sites, x 3 dates), and; 2) rapid field cover assessment data (> 5,500 sites x 4 dates). These evaluations are documented in Clarke et al., (2011).
Additional validation comparing LCI to the other AusCover fractional cover products and to SLATS field data is underway.