Variable ,Description,Unit
site_id,AmeriFlux site ID,CC-XXX
year,Study year,YYYY
case,Site ID + year,CC-XXX_YYYY
fpt_extent_day,Footprint extent (fetch) based on daytime footprint,m
fpt_extent_night,Footprint extent (fetch) based on nighttime footprint,m
fpt_area_day,Footprint area based on daytime footprint,m2
fpt_area_night,Footprint area based on nighttime footprint,m2
fpt_extent_day_sd,Footprint extent (fetch) standard deviation based on daytime footprint,m
fpt_extent_night_sd,Footprint extent (fetch) standard deviation based on nighttime footprint,m
fpt_area_day_sd,Footprint area  standard deviation based on daytime footprint,m2
fpt_area_night_sd,Footprint area  standard deviation based on nighttime footprint,m2
fpt_day_night_overlap,Footprint overlap index for daytime-nightitme overlap (0-1),unitless
fpt_day_monthly_overlap,Footprint overlap index for daytime seasonal overlap (0-1),unitless
fpt_night_monthly_overlap,Footprint overlap index for nighttime seasonal overlap (0-1),unitless
fpt_day_symmetry,Footprint symmetry index based on daytime footprint,unitless
fpt_night_symmetry,Footprint symmetry index based on nighttime footprint,unitless