Accuracy assessment of NLCD 2006 land cover and impervious surface

► We assess the thematic accuracy of NLCD 2006 land cover and impervious surface. ► Nationally, NLCD 2001 and 2006 overall accuracies were 79% and 78%, respectively. ► Land cover change accuracies were high for forest loss, urban gain, and water flux. ► More research on land-cover change reference label assignment is needed.