Click to download the national 2012 CDL zipped file National 2012 CDL (1.4 GB)

Click to download the national 2011 CDL zipped file National 2011 CDL (2 GB)

Click to download the national 2010 CDL zipped file National 2010 CDL (2 GB)

Click to download the national 2009 CDL zipped file National 2009 CDL (1 GB)

Click to download the national 2008 CDL zipped file National 2008 CDL (1 GB)

Click to download the national 2012 cultivated layer zipped file National 2012 Cultivated Layer (205 MB)

The following description of the confidence layer is from the document entitled 'MDA_NLCD_User_Guide.doc' which is available free for download with the NLCD Mapping Tool at http://www.mrlc.gov/. The Confidence Layer "spatially represents the predicted confidence that is associated with that output pixel, based upon the rule(s) that were used to classify it. This is useful in that the user can see the spatial representation of distribution and magnitude of error or confidence for a given classification... This error layer represents a percent confidence associated with each rule and output categorical, classified value. It is expressed as a percentage of confidence. A value of zero would therefore have a low confidence (always wrong), while a value of 100 would have a very high confidence (always right)." For more information on the use of confidence layers please refer to the following paper: Liu, Weiguo, Sucharita Gopal and Curtis E. Woodcock, 2004. Uncertainty and confidence in land cover classification using a hybrid classifier approach, Photogrammetric Engineering & Remote Sensing, 70(8):963-971. Ultimately, however, the confidence value is not a measure of accuracy for a given pixel but rather a how well it fit within the decision tree ruleset.

Click to download the 2012 CDL zipped confidence layer for the Western US (1.5 GB)

Click to download the 2012 CDL zipped confidence layer for the Eastern US (1.8 GB)

Click to download the 2012 CDL zipped confidence layer for the Central US (2.1 GB)