Canada is a signatory of the Kyoto Protocol and is obligated to report greenhouse gas sources and sinks associated with aforestation and deforestation. To do so, it has implemented a national forest sector carbon accounting system that brings together data from multiple resources, including a national forest inventory, growth and yield data from sample plots, statistics on change agents, and land-use change calculated from remote-sensing data. The accounting method integrates image processing and GIS analysis to monitor deforestation and calculate the carbon storage and changes, which are essential for Canadian national assessments.