Photogrammetric digital surface models and mosaiced orthoimagery for Barter Island, Alaska

Abstract

In 2017, the National Oceanic & Atmospheric Administration (NOAA), National Geodetic Survey, Remote Sensing Division (RSD) performed extensive aerial collection of imagery along Alaska's northeastern coastline in support of NOAA's Coastal Mapping Program. Data collected under this initiative are typically used to improve maritime chart products, serve as a baseline for shoreline change monitoring, and update the national shoreline database. This report summarizes photogrammetric digital surface models (DSMs) and an orthomosaic derived from this image dataset using Structure from Motion (SfM) techniques for the Barter Island area. Aerial images used to derive products described in this report were collected on July 19, 2017. Ground control points (GCPs) and checkpoints used for vertical correction and validation of this data were collected with Global Navigation Satellite System (GNSS) surveys by the U.S. Geological Survey (USGS) on September 4, 2014, and September 18, 2016. This data collection is being released as a Raw Data File with an open end-user license and includes the following for the Barter Island area: (1) orthomosaic raster, (2) DSM raster, (3) smoothed DSM raster, and (4) DSM hillshade. All files can be downloaded free of charge from the Alaska Division of Geological & Geophysical Surveys website (http://doi.org/10.14509/30456).