Ground control point and transect locations associated with images collected during unmanned aerial systems (UAS) flights over The Lake Ontario shoreline in the vicinity of Braddock Bay, New York in July 2017

Fifty-four ground control points, and 317 transect points, are listed in the CSV file 2017042FA_BraddockEast_GCP.csv. All locations were collected by the USGS field crew over two days of GPS data collection at Braddock Bay. The targets were moved to accommodate changing data acquisition locations over the two day period. Placed targets included commercial targets (4 ft x 4 ft x 4-mil thick PVC plastic sheets with black and white diamond patterns and grommets in corners; Berntsen International, Inc. product number AT48IC-STK), plywood targets (2 ft x 2 ft x 1/2-inch thick plywood boards painted with black and white squares). The commercial targets were designated Tnn and the plywood targets were designated Pnn, where nn is the one or two digit target number. Two differential GPS (Global Positioning System) rover instruments were used by field crews to map targets for ground control points, Spectra Precision model SP80 GNSS (Global Navigation Satellite System) receiver linked via Bluetooth to a data collector (Carlson CHC LT30 Handheld Terminal running Carlson SurvCE v. 4.06 software under Windows Mobile v. 6.1 Professional operating system). Both rover antennas were mounted on 2-m survey rods with bubble levels and 5-cm (2-inch) sand feet. Positions were determined with two GNSS rovers receiving real-time differential corrections from a GNSS base station established over a temporary benchmark on a concrete pad across from the WestPoint Marina office, in Braddock Bay, NY. The base station was a Spectra model SP80 GNSS receiver with UHF radio and external antenna mounted on a separate tripod. The antenna height was 2.25 m. The coordinates of the reference point were determined from an ultra-rapid precise orbit On-line Positioning User Service (OPUS) solution based on GPS data from an average over two days, nineteen-hour, occupation on July 10 and 11, 2017. Coordinates in NAD83(2011) UTM zone 18N (EPSG::6347), elevation NAVD88 (geoid 12b) for the reference point are: Northing (m) 4798402.548 (+/-0.0085), Easting (m) 280485.392 (+/-0.006), Orthometric elevation (m) 76.329 (+/-0.017). The uncertainties in parentheses represent peak-to-peak values. Ground control point measurements were converted to NAD83(2011) UTM zone 18N meters, NAVD88 (Geoid 12b) as the data were collected.

The 54 targets and 317 transect measurements were exported from the data collectors as text file in the RW5 format and then processed (referenced to the base opus rapid static solution) and exported to comma-separated values (CSV) files using the Carlson Report Generator for a SurvCE RW5 Report (https://www.carlsonemea.com/cwa/report). The individual datasets were combined and manually edited to filter by transect point or gound control point and extraneous columns were removed. The target data are used as an input to the Agisoft Photoscan software to control the data horizontally and vertically. The 317 transect points collected within the study area are used to ground truth the processed data products (Point Cloud, DEM and Orthomosaic) created in Agisoft Photoscan.

Added keywords section with USGS persistent identifier as theme keyword.