National Land Cover Database (NLCD) 2011 - Alaska

This update to the Alaska National Land Cover Database (NLCD) 2016 replaces the files dated 20200213. In this update the landcover footprint was extended along the northern coast to include the islands that were missed in previous versions, and several duplicate roads (offset by 1 or 2 pixels) were removed on the Aleutian Islands. The Alaska National Land Cover Database 2016 was created using change detection between the nominal dates of 2011 and 2016 utilizing Google Earth engine composites of Landsat imagery. Traditionally, previous classifications of Alaska used path row data and spectral comparisons between path rows along with ancillary data to derive areas of change. Alaska has many challenges for land cover...

Tags: AK, Alaska, GIS, Land Cover, Land Use Land Cover Theme, All tags... NGDA, National Geospatial Data Asset, U.S., U.S. Geological Survey, US, USGS, United States, digital spatial data, imageryBaseMapsEarthCover, Fewer tags

National Land Cover Database (NLCD) 2011 Accuracy Assessment Points Conterminous United States

Accuracy assessment is a standard protocol of National Land Cover Database (NLCD) mapping. Here we report agreement statistics between map and reference labels for NLCD 2011, which includes land cover for 2001, 2006, and 2011. The two main objectives were assessment of agreement between map and reference labels for the three, single-date NLCD land cover products at Level II and Level I of the classification hierarchy, and agreement for 17 land cover change themes based on Level I classes (e.g., forest loss; forest gain; forest, no change) for three change periods (2001–2006, 2006–2011, and 2001–2011). The single-date overall accuracies were 82%, 83%, and 83% at Level II and 88%, 89%, and 89% at Level I for 2011,...

Tags: Accuracy assessment, Land cover, Land cover change, NLCD, Reference data quality, All tags... U.S., US, United States, United States, imageryBaseMapsEarthCover, Fewer tags