Description of Data Sources

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	USFS - This database of US forest cover types was created by the US Forest Service from AVHRR satellite imagery at 1 km resolution. Metadata and database are available here.
	USGS - This database of US land cover types was created by the US Geological Survey from Landsat Thematic Mapper satellite data at 1 km resolution and 30 meter resolution and mapped in the Albers Conic Equal Area projection, NAD 83. 30 meter database available here. 1 km database available here.
	CCRS - This database of Canadian vegetation cover types was created by the Canada Centre for Remote Sensing from AVHRR satellite imagery at 1 km resolution. Database and metadata are available here.
	UCSB - The database of federal and state land ownership was created by the Remote Sensing Research Unit in the Department of Geography at the University of California-Santa Barbara and is presented at 1 km resolution. Database and metadata are available here.
	BTS - This database of US roads was created by the US Department of Transportation, Bureau of Transportation Statistics. Downloadbale maps and metadata are available here.