BigFoot

The overall goal of BigFoot was to provide validation of MODLand (MODIS Land Science Team) science products, including land cover, leaf area index (LAI), fraction absorbed photosynthetic active radiation (fAPAR) , and net primary production (NPP). To do so, we used ground measurements, remote sensing data, and ecosystem process models at sites representing different biomes. BigFoot sites measured 5 x 5 km in size and surrounded the relatively small footprint (1 km2) of CO2 flux towers. At each site we made multi-year in situ measurements of ecosystem structure and functional characteristics related to the terrestrial carbon cycle. Our sampling design allowed us to explicitly examine scales of fine-grained spatial pattern in these properties, and provided for a field-based ecological characterization of the flux tower footprint. Multi-year measurements ensured that inter-annual validity of MODLand products were assessed.