Journal
REMOTE SENSING
Volume 1, Issue 4, Pages 842-857Publisher
MDPI
DOI: 10.3390/rs1040842
Keywords
spectral vegetation index; soil noise; soil line; vegetation isoline
Categories
Funding
- JSPS KAKENHI [21510019]
- Sao Paulo Foundation Research (FAPESP) [98/01059-7]
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This paper introduces derivations of soil line influences on two-band vegetation indices (VIs) and vegetation isolines in the red and near infra-red reflectance space. Soil line variations are described as changes in the soil line parameters (slope and offset) and the red reflectance of the soil surface. A general form of a VI model equation written as a ratio of two linear functions (e.g., NDVI and SAVI) was assumed. It was found that relative VI variations can be approximated by a linear combination of the three soil parameters. The derived expressions imply the possibility of estimating and correcting for soil-induced bias errors in VIs and their derived biophysical parameters, caused by the assumption of a general soil line, through the use of external data sources such as regional soil maps.
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