This research effort is designed to investigate effectiveness of burn severity mapping, using differenced Normalized Burn Ratio (dNBR) for ecosystem monitoring at the 30m scale. The hypothesis of our research is that the differenced normalized burn ratio, calibrated and validated using post-fire ground data (Composite Burn Index, or CBI), can perform consistently for difference climate/vegetation regions and faithfully for new as well as old burns. The research is being conducted on burns located on public lands in most regions of the country, including boreal, western arid, western mountain conifer, and eastern humid ecosystems. CBI data collection is supported through generous assistance by the NPS personnel.