Methodology ยท Sun-induced fluorescence
Sun-induced fluorescence (SIF) retrieval
Retrieves photosynthetic activity of vegetation from solar-induced chlorophyll fluorescence at O2-A/B Fraunhofer lines; good for gross primary production estimation and vegetation stress detection.
How it works
SIF constitutes only 0.5-2% of top-of-canopy radiance and requires both high spectral resolution (~0.3 nm) and advanced retrieval schemes (DOAS/PCA-based infilling of Fraunhofer lines at 687 nm and 760 nm). TROPOMI demonstrated at 3.5 x 5.6 km; ESA FLEX mission dedicated to SIF at 300 m. Distinct from vegetation indices -- SIF measures active photosynthesis, not greenness. [Wikipedia: Solar-induced fluorescence](https://en.wikipedia.org/wiki/Solar-induced_fluorescence)
Topics this serves
- Crop stress and yield well suited
- Drought adequate
- Greenhouse gas inventory adequate
Existing implementations
No implementations recorded yet.
Sources
- [wikipedia]Wikipedia: Solar-induced fluorescencecommunityaccessed 2026-05-22
Methodology
Edited from public sources. Last reviewed date pending by SpectraWorks editorial. See the data dictionary for field definitions.