The Accelerated Canopy Chemistry Program (ACCP) was an investigation to determine the theoretical and empirical basis for remote sensing of nitrogen and lignin concentrations in vegetation canopies of different ecosystems. The study focused on chemical composition, spectral analysis, and remote sensing.

Approximately 1000 leaf samples from fresh forest foliage were collected from 5 geographically distinct sites and analyzed at the University of New Hampshire to determine carbon constituents (non-polar, polar, cellulose, and lignin) content using a series of extractions, and nitrogen content using a standard combustion procedure. Results were used as a calibration set for Visible/NIR reflectance and the estimation of carbon and nitrogen concentrations at both the leaf and canopy level. The canopy level study used high spectral resolution data from NASA's AVIRIS to estimate canopy level nitrogen and lignin concentration for the study sites.

The ORNL DAAC ACCP Data archive includes the following:

• Leaf Carbon and Nitrogen
• Leaf Chemistry
• Seedling Canopy Chemistry
• Seedling Canopy Reflectance
• Site AVIRIS Images
• Leaf Reflectance

The following ACCP resources are maintained by the ORNL DAAC:

• ACCP Project/Campaign Document