Working with federal agencies, Esri is opening up access in ArcGIS Online to dozens of high-priority, high-demand national data layers, often referred to as A-16 data. These include cartographic boundary files and demographic data from the US Census Bureau; National Agriculture Imagery Program (NAIP) data from the US Department of Agriculture (USDA); and the National Inventory of Dams (NID) database, managed by the US Army Corps of Engineers.