Two DJI Phantom 3 quadcopter UAS were flown to acquire these images; one owned and flown by Peter Traykovski, the other owned and flown by Simon Miner. The images were geotagged in flight by the UAS; 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 2016-053-FA " -Caption-Abstract="Town Neck Beach, Sandwich, Massachusetts, USA from survey 2016-053-FA " -Caption="Town Neck Beach, Sandwich, Massachusetts, USA from survey 2016-053-FA " -sep ", " -keywords="Town Neck Beach, Sandwich, Massachusetts, 2016-053-FA, UAS, aerial imagery, USGS " -comment="Photo from down-looking UAS camera during survey 2016-053-FA." -Credit="U.S. Geological Survey" -Contact="WHSC_data_contact@usgs.gov " -Artist="Peter Traykovski" (or "Simon Miner") *.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, image name '2016053FA_U015SMP3_20160122T185830Z_DJI_0012.JPG', 2016053FA is the survey ID, U015 is the internal identifier code, SMP3 is the internal camera ID where 'SMP3' refers to the DJI Phantom 3 operated by Simon Miner, 20160122 is the UTC date in format YYYYMMDD. A 'T' is used to separate UTC date from UTC time in format HHMMSS followed by a Z (for Zulu), and 'DJI_0012.JPG' is the original raw photo name appended to the end of the new filename. For images taken by the DJI Phantom 3 operated by Peter Traykovski, the camera ID is 'DJP3'.