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9 lines
1.1 KiB
Markdown
9 lines
1.1 KiB
Markdown
# Overview
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The parts of the Sentinel-2 data that extend the visible spectrum can be used to calculate _Spectral Indices_ or _Spectral Indicators_.
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These indicators can be used for a range of different tasks. The Normalised Difference in Water Index (NDWI) for example gives information about how likely a pixel represents water, the Bare-Soil Index (BSI) gives an estimate about how likely a pixel represents unvegetaed soil. Other indices give an indication about vegetation health or plant activity using reflectance properties of the ground in different spectra of light.
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This chapter explores how to calculate these indices over long and short time spans, leveraging the high spatial resolution to provide highly localized information using these indices.
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It ends with a notebook that implements the BSI, the NDWI, the Normalized Difference In Vegetation Index (NDVI) and the Normalized Burn Ratio (NBR) which can be used to determine burn severity after a fire. The implementation is extensible enough to perform many different kinds of index calculations on downloaded products with only minimal changes.
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