Alaska IfSAR Digital Elevation Model (DEM) Data

157,000 square-kilometers of airborne IfSAR data were flown summer of 2010. An additional 210,725 square-kilometers of restrictively licensed IfSAR-derived DEM data collected in 2012 have been uplifted into the public domain through this contract and are available for download from this site. Alaska Statewide IFSAR Status Map

The project is being administered by the USGS through their GPSC vehicle. Major funding contributors include the National Geospatial-Intelligence Agency (NGA), State of Alaska, and USGS. Supporting contributors include the Natural Resources Conservation Service (NRCS), Bureau of Land Management (BLM), the National Park Service, the US Fish and Wildlife Service and the US Forest Service.

These data consists of three products: Bare-earth DEM (DTM), Surface DEM (DSM), and an orthorectified radar intensity image (ORI). The elevation models have a 5-meter post spacing, 22-foot contour equivalent accuracy, vertical accuracy of 3-meter LE90 (0-10 degree slope) and horizontal accuracy of 12.2-meter CE90.

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