Low-altitude aerial imagery collected from a kite at Head of the Meadow Beach, Truro during field activity 2020-015-FA on March 6, 2020

These JPG images were collected with a camera (Ricoh GRII HD) labeled 'r##', where 'r' indicates a Ricoh camera, and the following 2 digits normally indicate the camera ID. The camera was wired to the GNSS receiver and duct taped to a PVC flange (2020015FA_Truro_CameraGNSS_browse.JPG), which was mounted with the multi-band GNSS antenna on the back of the camera on an 11 meter Ozone Enduro V2 kitesurfing kite (2020015FA_Truro_KiteCameraAttachment_browse.JPG) for the first flight and then switched to a 9 meter Ozone Reo V5 kite for the second flight when the wind picked up. The kites were on a 50 meter string and Ozone Contact Water V4 control bar, the latter which was walked down the beach. The camera orientation for all flights was oblique based on the nature of maintaining control of the kite. Horizontal positions and elevations of each image (2020015FA_Truro_f1_photolocations.csv and 2020015FA_Truro_f2_photolocations.csv) were recorded from an GNSS receiver (EMLID Reach M2), which were processed in PPK mode with a base station (JAVAD Triumph-1). The navigation data is added to the image EXIF information after the flight as described in the process steps. These JPG images may be used with photogrammetric software to produce geolocated point clouds, digital elevation models, orthomosaics, and other products. It is recommended when using the software to also use the navigation positions and the Aeropoint locations (see larger work citation Navigation: 2020015FA_Truro_nav_AeroPoints.csv) as ground control points. Note that not all images may align when processed in photogrammetry software.

The GNSS navigation data was processed in Inertial Explorer (https://novatel.com/products/waypoint-software/inertial-explorer, version 8.70.8722). In the software, the data were processed using an 'Antenna Height' of 0.0 m to indicate that there was no offset from the camera. The positions were processed in the NAD83(2011) datum, providing the Latitude, Longitude, and H_Ell_m attributes and then Geoid 12B was applied using NAVD88 as the vertical datum in the UTM Zone 19N to produce the Northing, Easting, and H_Ortho_m attributes.
All of the attributes here are provided in the 2020015FA_Truro_f1_photolocations.csv and 2020015FA_Truro_f2_photolocations.csv but only the latitude and longitude are put in the image EXIF data with the horizontal datum.

The images acquired with the camera were geotagged and processed to add additional information required by the USGS to the EXIF headers using ExifTools (https://exiftool.org/, version: 12.06) and the files were renamed to a unique identifier using Namexif (http://www.digicamsoft.com/softnamexif.html, version 2.1) to avoid any possibility of duplicate names. These steps are described here:
1. ExifTools was used to geotag each photo with the GPSDateStamp, GPSTimeStamp, GPSLatitude, and GPSLongitude with the command: exiftool -csv=directoryname\EXIF_tags.csv ; where the CSV file has the following headings and information (anything in () is format based and is only provided to give more context) -Credit="U.S. Geological Survey " -Contact="WHSC_data_contact@usgs.gov " -Copyright="Public Domain " -ImageDescription="Photographs of Head of the Meadow Beach, Truro, Massachusetts, USA from USGS field survey 2020-015-FA " -Attribution="https://doi.org/10.5066/P9KSG1RQ " -Event="USGS Field Activity 2020-015-FA " -GPSAreaInformation="position post-processed from nearby GPS " -GPSMapDatum="ESPG: 6317 (NAD83(2011)) " -GPSDateStamp="2020:03:06 " -GPSTimeStamp="(HH:MM:SS) " -GPSLatitude="(in decimal degrees) " -GPSLatitudeRef="N " -GPSLongitude="(in decimal degrees)" -GPSLongitudeRef="W " -Artist="Peter Traykovski (WHOI)" -Comment="flight number # of 2 (where # is either 1 or 2) " -OriginalFilename="M#######.JPG (where # combinations are unique) " *.JPG
Keywords were added with the following exiftool -sep ", " -iptc:keywords="Head of the Meadow Beach, Massachusetts, 2020-015-FA, Ricoh, USGS, aerial imagery" *.JPG
To read out the photo information to a csv the command is exiftool -csv -f -filename -GPSDateStamp -GPSTimeStamp -GPSLongitude -GPSLatitude -n -Artist -Contact -Comment -Credit -Copyright -ImageDescription -OriginalFileName -AttributionURL -Event -GPSAreaInformation -GPSMapDatum *.JPG > directoryname/out.csv Fewer tags or additional tags may be taken out with this command from those written above.
2. All the JPG images were renamed with Namexif to ensure unique filenames and compliance with the USGS Coastal and Marine Hazards and Resources Program's best practices for image naming convention. Images were renamed with a field survey ID prefix; a flight number and ID that distinguishes among USGS 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 '2020015FA_f01r02_20200306T165822Z_M1040356.JPG', 2020015FA is the survey ID, f01 is the flight number, r02 is the internal camera ID, 20200306 is the UTC date in the format YYYYMMDD. A 'T' is used to separate UTC date from UTC time in format HHMMSS followed by a Z, and M1040356.JPG is the original raw photo name appended to the end of the new filename.