A DJI Phantom 4 quadcopter UAS was flown by Peter Traykovski to acquire these images. They were geotagged in flight by the UAS. It 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 10.64) was used to add required attribution tags to all the photos. The command used to update and add the tags for all the photos was: exiftool -AllDates+=4 -CopyrightNotice="Public Domain - please credit U.S. Geological Survey " -ImageDescription="Photographs of Town Neck Beach, Sandwich, Massachusetts, USA from survey 2017-010-FA " -Caption-Abstract="Town Neck Beach, Sandwich, Massachusetts, USA from survey 2017-010-FA " -Caption="Town Neck Beach, Sandwich, Massachusetts, USA from survey 2017-010-FA " -sep ", " -keywords="Town Neck Beach, Sandwich, Massachusetts, 2017-010-FA, UAS, aerial imagery, USGS " -comment="Photo from down-looking UAS camera during survey 2017-010-FA." -Credit="U.S. Geological Survey" -Contact="WHSC_data_contact@usgs.gov " -Artist="Peter Traykovski" *.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 and Marine Geology 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 '2017027FA_U029DJP4_20170428T092440Z_DJI_0678.JPG', 2017027FA is the survey ID, U029 is the internal identifier code, DJP4 is the internal camera ID, 20170428 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, and DJI_0678.JPG is the original raw photo name appended to the end of the new filename.