U.S. Geological Survey
2018
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
1.0
digital text files
data release
DOI:10.5066/F74F1PX3
Woods Hole Coastal and Marine Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
https://doi.org/10.5066/F74F1PX3
https://www.sciencebase.gov/catalog/item/5a5cb30be4b06e28e9bcd246
Christopher R. Sherwood
Sandra M. Brosnahan
Seth D. Ackerman
Jonathan Borden
Ellyn T. Montgomery
Elizabeth A. Pendleton
Emily J. Sturdivant
2018
Aerial imagery and photogrammetric products from unmanned aerial systems (UAS) flights over the Lake Ontario shoreline at Braddock Bay, New York, July 10 to 11, 2017.
1.0
data release
DOI:10.5066/F74F1PX3
Reston, VA
U.S. Geological Survey
Suggested citation: Sherwood C.R., Brosnahan S.M., Ackerman S.D., Borden Jonathan, Montgomery E.T., Pendleton E.A., and Sturdivant, E.J., 2018, Aerial imagery and photogrammetric products from unmanned aerial systems (UAS) flights over the Lake Ontario shoreline at Braddock Bay, New York, July 10 to 11, 2017: U.S. Geological Survey data release, https://doi.org/10.5066/F74F1PX3.
https://doi.org/10.5066/F74F1PX3
https://www.sciencebase.gov/catalog/item/5a329336e4b08e6a89d88012
Low-altitude (80-100 meters above ground level) digital images were obtained from a camera mounted on a 3DR Solo quadcopter, a small unmanned aerial system (UAS), in three locations along the Lake Ontario shoreline in New York during July 2017. These data were collected to document and monitor effects of high lake levels, including shoreline erosion, inundation, and property damage in the vicinities of Braddock Bay, Sodus Bay, and Chimney Bluffs State Park, New York. This data release includes images tagged with locations determined from the UAS GPS; tables with updated estimates of camera positions and attitudes based on the photogrammetric reconstruction; tables listing locations of the base stations, ground control points, and transect points; geolocated, RGB-colored point clouds; orthomosaic images; and digital elevation models for each of the survey regions. Collection of these data was supported by the Federal Emergency Management Agency, the State of New York Departments of State and Environmental Conservation, and the USGS Coastal and Marine Geology Program and was conducted under USGS field activity number 2017-042-FA.
The objective of obtaining these ground control points was to constrain the photogrammetric products constructed from the aerial images taken at Braddock Bay, by providing survey-quality ground validation, which far exceeds the accuracty that can be provided from the photo geolocations alone. Transect points are used to validate the final accuracy of the products, and ground control points are used geolocate the products as accurately as possible.
For more information about this field activity, see https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-042-FA. Photogrammetric processing using ground control points produces estimates of camera location and attitude (roll, pitch, and yaw) with much higher accuracies than can be provided by a GPS attached to the UAS. These tables contain position information derived using surveying techniques, and are used in post-processing to improve the quality of the positioning in the final photogrammetric products.
20170710
20170711
ground condition, temporary markers
None planned
-77.713289
-77.682145
43.312040
43.296576
USGS Metadata Identifier
USGS:5a5cb30be4b06e28e9bcd246
None
U.S. Geological Survey
USGS
Coastal and Marine Geology Program
CMGP
Woods Hole Coastal and Marine Science Center
WHCMSC
State of New York Department of State
State of New York Department of Environmental Conservation
Federal Emergency Management Agency
low-altitude aerial imagery
lakeshore
transect points
ground control points
navigation
Global Positioning System
Spectra Precision SP80
Carlson SurvCE
GPS
field activity number 2017-042-FA
USGS Thesaurus
navigational data
ISO 19115 Topic Category
inlandWaters
location
elevation
None
USA
Great Lakes
New York
Lake Ontario
Braddock Bay Wildlife Management Area
Braddock Bay
Greece, NY
Braddock Point
Westpoint Marina
Braddock Bay Park
none
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.
U.S. Geological Survey
Sandra Brosnahan
Physical Scientist
mailing and physical address
384 Woods Hole Road
Woods Hole
Massachusetts
02543-1598
508-548-8700 x2265
508-457-2310
sbrosnahan@usgs.gov
https://www.sciencebase.gov/catalog/file/get/5a5cb30be4b06e28e9bcd246/?name=2017042FA_BraddockBay_GCPs_browse.jpg
Browse image of part of the ground control point text file
JPEG
Three Spectra Precision SP80 GNSS receivers were used to collect the ground control points and transect coordinates. Two of the units functioned as "rovers" and the third was a stationary base broadcasting a signal from a static point, later used to correct all rover coordinates. Overall measured horizontal accuracy based on re-occupation of the same location was 1.5 cm and vertical accuracy was 0.5 cm.
The CSV file lists the locations (coordinates in NAD83(2011) UTM zone 18N (EPSG::6347) for the horizontal, and NAVD88 meters, GEOID 12b, for the vertical) for all 54 ground control points, including commercial targets and plywood targets, as well as 317 transect points. The text contains one header record, and 371 data records with nine columns of comma-separated values. The columns contain, in order, the name, northing, easting, elevation, latitude, longitude, date collected, and whether it's a target or transect. Northing and Easting are in the NAD83(2011) UTM zone 18N (EPSG::6347) coordinate system. Elevation is in meters referenced to NAVD88. No formal logical accuracy tests were conducted. The ground control points and transect points were collected at the same time and with the same equipment. The target names (ORIGINAL_ID) are uniquely named (e.g P1, T20, T31); each transect (consisting of several GPS fixes along a survey line) has a unique name however the points for that transect are all named similarly (e.g there 12 locations all called TRANSECT CRANBERRY RD).
Locations for all 54 of the ground control points and 317 transect points collected in the Braddock Bay study area are listed in the CSV text file.
Horizontal 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 10th and 11th, 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. Both of the rovers were Spectra Precision model SP80 GNSS receivers 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. The estimated uncertainty of target locations was determined by examining differences for repeat measurements of the same target, lumping measurements for all real-time kinematic (RTK) rovers. The mean of the standard deviations for repeat measurements was 1.5 cm (horizontal) and 0.5 cm (vertical). Combined with the uncertainty in OPUS fixes for the RTK-GPS base stations, the overall accuracy of the ground control point locations is 1.76 cm (horizontal) and 0.54 cm (vertical). Conversions from satellite coordinates to NAD83(2011) UTM zone 18N (EPSG::6347) and NAVD88 were made by Carlson SurvCE software in the data collector.
Vertical positions were determined with the 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. (see Horizontal_Positional_Accuracy_Report for a complete description of the survey methods). The estimated the uncertainty of target locations was determined by examining differences for repeat measurements of the same target, lumping measurements for all RTK rovers. The mean of the standard deviations for repeat measurements was 1.5 cm (horizontal) and 0.5 cm (vertical). Combined with the uncertainty in OPUS fixes for the RTK-GPS base stations, the overall accuracy of the ground control point locations is 1.76 cm (horizontal) and 0.54 cm (vertical).
U.S. Geological Survey
Unpublished Material
unpublished raw GPS ground control points and transect data collected during field activity 2017-042-FA
digital text files
https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-042-FA
raw GPS data
20170710
20170711
ground condition
raw GPS ground control points and transect data from USGS field activity 2017-042-FA
The ground control points or GCPs were used to constrain the photogrammetric products produced from aerial images taken at Braddock Bay, NY. The transect data is used to ground truth the results from the point cloud, the digital elevation model, and the orthomosaic constructed from the aerial images. This GCP and transect navigation data represented as a CSV text file.
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.
201707
Sandy Brosnahan
U.S. Geological Survey
physical scientist
mailing and physical address
U.S. Geological Survey
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
508-548-8700 x2265
508-457-2310
sbrosnahan@usgs.gov
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.
20170822
Sandy Brosnahan
U.S. Geological Survey
physical scientist
mailing and physical address
U.S. Geological Survey
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
508-548-8700 x2265
508-457-2310
sbrosnahan@usgs.gov
Added keywords section with USGS persistent identifier as theme keyword.
20200807
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Point
Point
371
Universal Transverse Mercator
0.999600
-75.00000
0.000
500000.0000
0.0000
coordinate pair
0.0001
0.0001
meters
North American Datum of 1983 (2011)
Geodetic Reference System 80
6378137.000000
298.257222101
North American Vertical Datum of 1988 (NAVD88)
0.0001
meters
Explicit elevation coordinate included with horizontal coordinates
Ground control points and transect point locations
target points and transect points collected using surveying techniques. These tables are used in post-processing to improve the quality of the positioning in the final photogrammetric products (ground control points) and it assessing the vertical accuracy of the final products (transects)
U.S. Geological Survey
NORTHING
Northing coordinate in UTM Zone 18 meters, NAD83 (2011)
U.S. Geological Survey
4797388.474
4798955.389
meters
EASTING
Easting coordinate in UTM Zone 18 meters, NAD83 (2011)
U.S. Geological Survey
280277.1044
282299.634
meters
ELEVATION
Orthometric elevation relative to NAVD88 (geoid12a)
U.S. Geological Survey
75.5888
79.1047
meters
ORIGINAL_ID
Target or transect identifier (name) provided by the surveyor to differentiate between targets and transects, to flag misidentified targets, and to make comments similar to field notes
U.S. Geological Survey
character set used to identify target name and distinguish from transect
DATE_Collected
Date of point collection in m/dd/yy format
U.S. Geological Survey
character set to represent calendar date of collection
Description
simple descriptor used to distinguish between ground control points (Target) and transect points (TRANS)
U.S. Geological Survey
character set
The text file 2017042FA_BraddockBay_GCPs.csv lists the locations (coordinates in NAD83(2011) UTM zone 18N (EPSG::6347) for the horizontal, and NAVD88, GEOID 12b, for the vertical, meters) of all 54 ground control points, and 317 transect points. The text contains one header record, and 371 data records with nine columns of comma-separated values. The columns contain, in order, the name, northing, easting, elevation, date collected, and whether it's a target or transect. The columns contain, in order, NORTHING, EASTING, ELEVATION, ORIGINAL_ID (target or transit name), LOCATION (study area), DATE_Collected, and Description (whether it's a target or transect). Northing and Easting are NAD83(2011) UTM zone 18N (EPSG::6347) coordinate system, meters. Elevation is in meters referenced to NAVD88. The target names (ORIGINAL_ID) are uniquely named (e.g P1, T20, T31); each transect (consisting of several GPS fixes along a survey line) has a unique name however the points for that transect are all named similarly (e.g there 12 locations all called TRANSECT CRANBERRY RD).
USGS Field Activity 2017-042-FA
U.S. Geological Survey - ScienceBase
mailing and physical address
Denver Federal Center, Building 810, Mail Stop 302
Denver
CO
80225
1-888-275-8747
sciencebase@usgs.gov
This data release contains the CSV file 2017042FA_BraddockBay_GCPs.csv, a browse graphic (2017042FA_BraddockBay_GCPs_browse.jpg) and associated metadata 2017042FA_BraddockBay_GCPs.xml
Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
CSV
Comma-separated value (CSV) file 2017042FA_BraddockBay_GCPs.csv and FGDC CSDGM metadata in XML format.
Use WinZip, 7zip, Peazip or pkUnzip
0.011
https://www.sciencebase.gov/catalog/item/5a5cb30be4b06e28e9bcd246
https://www.sciencebase.gov/catalog/file/get/5a5cb30be4b06e28e9bcd246
https://doi.org/10.5066/F74F1PX3
The first link is to the page containing the data, the second link downloads all data available from the page as a zip file, and the third link is to the publication landing page.
none
The CSV file is plain text with comma separated values. It can be read with most text editors or spreadsheet programs.
20200807
Sandra Brosnahan
U.S. Geological Survey
Physical Scientist
mailing and physical address
U.S. Geological Survey
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
508-548-8700 x2265
508-457-2310
sbrosnahan@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
None
None