THE CEOS DATABASE : Missions, Instruments and Measurements
CEOS EO HANDBOOK – MEASUREMENTS
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Vegetation


Changes in land cover are important aspects of global environmental change, with implications for ecosystems, biogeochemical fluxes and global climate. Land cover change affects climate through a range of factors from albedo to emissions of greenhouse gases from the burning of biomass. Deforestation increases the amount of carbon dioxide (CO2) and other trace gases in the atmosphere.
Detailed MeasurementDescription*InstrumentsTimeline
Chlorophyll Fluorescence from Vegetation on LandSolar induced chlorophyll fluorescence occurs during photosynthesis. It exhibits a strong linear correlation with terrestrial gross primary production (GPP). Direct global space borne observations of the fluorescence emission provide the same or better GPP estimations as those derived from traditional remotely-sensed vegetation indices using ancillary data and model assumptions.2 instruments
Land coverProcessed from land surface imagery by assigning identified cluster(s) within a given area to specific classes of objects - Accuracy expressed as number of classes. Actually [ classes-1 ] is used, so that smaller figure corresponds to better performance, as usual.48 instruments
Leaf Area Index (LAI)One half of the total projected green leaf fractional area in the plant canopy within a given area. Representative of total biomass and health of vegetation - Physical unit: [ % ] - Accuracy unit: [ % ].15 instruments
Normalized Differential Vegetation Index (NDVI)Difference between maximum (in NIR) and minimum (around the Red) vegetation reflectance, normalised to the summation. Representative of total biomass, supportive for computing LAI if not directly measured - Physical unit: [ % ] - Accuracy unit: [ % ].24 instruments
Soil typeResult of the classification of different types of soil within a vegetated area - Accuracy expressed as number of classes. Actually [ classes-1 ] is used, so that smaller figure corresponds to better performance, as usual.12 instruments
Vegetation Canopy (cover)Fraction of the ground area covered by tree crowns in %.4 instruments
Vegetation Canopy (height)Vertical projection of an area covered by tree crowns in meters.3 instruments
Vegetation CoverFraction of vegetated land in an area - Physical unit: [ % ] - Accuracy unit: [ % ].13 instruments
Vegetation typeResult of the classification of different types of vegetation within a vegetated area - Accuracy expressed as number of classes. Actually [ classes-1 ] is used, so that smaller figure corresponds to better performance, as usual.62 instruments
* Description adapted from WMO.
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