Two UAS were flown to acquire these images; one owned and flown by Peter Traykovski, the other owned and operated by Airshark LLC. The DJI images were geotagged in flight by the UAS. The Airshark images were geotagged by Ian Ray of Airshark immediately after the flights and provided to the USGS as geotagged images. Both used local time, so an adjustment to GMT was made (see first parameter of step 1 below). They were also processed to add USGS required information to the EXIF headers and renamed to unique file names. These steps are described here:
1. ExifTool (https://www.sno.phy.queensu.ca/~phil/exiftool/
, version 10.75) was used to add required attribution tags to all the photos. The command used to update the tags was: exiftool -AllDates+=4 -CopyrightNotice="Public Domain - please credit U.S. Geological Survey " -ImageDescription="Photographs of Town Neck Beach, Sandwich, Massachusetts, USA from survey 2016-013-FA " -Caption-Abstract="Town Neck Beach, Sandwich, Massachusetts, USA from survey 2016-013-FA " -Caption="Town Neck Beach, Sandwich, Massachusetts, USA from survey 2016-013-FA " -sep ", " -keywords="Town Neck Beach, Sandwich, Massachusetts, 2016-013-FA, UAS, aerial imagery, USGS " -comment="Photo from down-looking UAS camera during survey 2016-013-FA." -Credit="U.S. Geological Survey" -Contact="WHSC_data_contact@usgs.gov " -Artist="Peter Traykovski" (or "Airshark") *.JPG
2) All the JPEG images were renamed with Namexif (version 1.7, http://www.digicamsoft.com/softnamexif.html
) to ensure unique filenames and compliance with USGS Coastal/Marine Hazards and Resources Program's best practices for image naming convention. Images were renamed with a survey ID prefix followed by a local USGS UID, which corresponds to a distinct UAS project; a camera ID that distinguishes among the cameras by make, model, and camera number; the image acquisition date and coordinated universal time (UTC) in ISO8601 format; and a suffix with the original image name. For example, in this image name '2016013FA_U018AS5R_20160330T145026Z_DSC05859.JPG', 2016043FA is the survey ID, U019 is the internal identifier code, AS5R is the internal camera ID for the Airshark UAS camera, 20160330 is the UTC date in format YYYYMMDD. A 'T' is used to separate date from UTC time in format HHMMSS followed by a Z (for Zulu), and 'DSC05859.JPG' is the original raw photo name appended to the end of the new filename. For images taken by the DJI Phantom 3, the camera ID is 'DJP3'.