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Biophysical Focus Area Contributions to International Structures

GCOS

GCOS target requirements for LAI and fAPAR were set as follows (GCOS-200):

Variable/Parameter Horizontal Resolution Vertical Resolution Temporal Resolution Accuracy Stability
LAI 250m N/A daily Max (15%) Max (10%;0.25)
fAPAR 200/500m N/A daily Max (10%;0.05) Max (3%;0.02)

The LAI focus area of CEOS LPV plays a key coordination role and lends the expertise to address actions related to validation of global LAI and fAPAR measurements as identified in GCOS-200. CEOS LPV specifically contributes to IP-10 Action T3 (Liaison with ICOS, TERN and NEON underway protocols so continuous in situ observations can be applied for validation), T4 (Good Practice Protocol and recommendations, the Online Validation Platform Exercise (OLIVE). Additionally LPV LAI and fAPAR contributes towards action items T35, T36, T37, T40, T41.


GTOS LAI and fAPAR ECV Reports and Fact Sheets

Gobron, N. and M. Verstraete. 2009. Leaf Area Index, ECV-T11: GTOS Assessment of the status of the development of standards for the Terrestrial Essential Climate Variables, ed., R. Sessa, FAO, Rome.   Factsheet

Gobron, N. and M. Verstraete. 2009. Fraction of Absorbed Photosynthetically Active Radiation, ECV-T10: GTOS Assessment of the status of the development of standards for the Terrestrial Essential Climate Variables, ed., R. Sessa, FAO, Rome.   Factsheet


FRM4VEG (Fiducial Reference Measurements for Vegetation)

The aim of ESA's FRM4VEG project is to establish the protocols required for traceable in situ measurements of vegetation-related parameters, to support the validation of satellite vegetation products. The project aims to develop techniques for applying, insofar as is possible, the FRM concept to in situ measurements of three vegetation-related parameters. These are surface reflectance, the fraction of absorbed photosynthetically active radiation (FAPAR) and canopy chlorophyll content.


QA4ECV

Nadine Gobron, of JRC and a former co-lead for the LPV fAPAR focus area, is deputy leader of WP5 (Validation of multi-decadal ECV data using the QA system).


Links to Measurement Networks

  • ImagineS : Implementation of Multi-scale Agricultural Indicators Exploiting Sentinels
  • NEON: National Ecological Observatory Network (US Only)
  • ICOS: Integrated Carbon Observation System (Europe)
  • EnviroNet

 

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