Photogrammetry-derived digital surface model and orthoimagery of Valdez Glacier ice-dammed lake, Valdez, Alaska, October 12, 2016

Abstract

The State of Alaska Division of Geological & Geophysical Surveys (DGGS) produced a digital surface model (DSM) and an orthorectified aerial image over Valdez Glacier ice-dammed lake in support of glacial lake outburst flood hazard assessment and monitoring. Aerial photographs and Global Navigation Satellite System (GNSS) data were collected on October 12, 2016, and were processed using Structure-from-Motion (SfM) photogrammetric techniques to create orthoimagery and a DSM. DSMs represent surface elevations of all surfaces, including vegetation, vegetation-free land, bridges, buildings, and so on. The DSM is a single-band, 32-bit float GeoTIFF file, with a ground sample distance (GSD) of 0.19 m. The No Data value is set to -32767. All files can be downloaded free of charge from the DGGS website (http://doi.org/10.14509/30200).