Aerial Imagery of the North Carolina Coast: 2019-10-11

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Christine J. Kranenburg
Originator: Andrew C. Ritchie
Originator: Jenna A. Brown
Originator: Jin-Si R. Over
Originator: Christopher R. Sherwood
Originator: Jonathan A. Warrick
Originator: Phillipe A. Wernette
Publication_Date: 20220124
Title: Aerial Imagery of the North Carolina Coast: 2019-10-11
Geospatial_Data_Presentation_Form: remote-sensing image
Larger_Work_Citation:
Citation_Information:
Originator: Christine J. Kranenburg
Originator: Andrew C. Ritchie
Originator: Jenna A. Brown
Originator: Jin-Si R. Over
Originator: Christopher R. Sherwood
Originator: Jonathan A. Warrick
Originator: Phillipe A. Wernette
Publication_Date: 20220124
Title: Aerial Imagery of the North Carolina Coast: 2019-10-11
Series_Information:
Series_Name: U.S. Geological Survey Data Release
Issue_Identification: DOI:10.5066/P9RRSMOJ
Publication_Information:
Publication_Place: St. Petersburg, Florida
Publisher:
U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
Online_Linkage: https://doi.org/10.5066/P9RRSMOJ
Description:
Abstract:
The U.S. Geological Survey (USGS) Remote Sensing Coastal Change (RSCC) project collects aerial imagery along coastal swaths, in response to storm events, with optimized endlap/sidelap and precise position information to create high-resolution orthomosaics, three-dimensional (3D) point clouds, and digital elevation/surface models (DEMs/DSMs) using Structure-from-Motion (SfM) photogrammetry methods. These products are valuable for measuring topographic and landscape change, and for understanding coastal vulnerability and response to disturbance events. A nadir (vertical) aerial imagery survey was conducted from Cape Lookout, North Carolina to Duck, North Carolina on October 11th, 2019, to document recovery conditions after the passage of Hurricane Dorian in September 2019. The observations along the coastline cover an approximately 250-kilometer-long by 300 to 700-meter-wide swath of coastline and encompass both highly developed towns as well as natural, undeveloped areas, including the federal lands of Cape Lookout National Seashore and Cape Hatteras National Seashore. Low altitude (300 meters above ground level) digital aerial imagery were acquired from a manned, fixed-wing aircraft using a Sony A7R 36 Megapixel digital camera, along with precise aircraft navigation Global Navigation Satellite System (GNSS) data. Data were collected in shore-parallel lines, flying at approximately 50 meters per second (m/s) and capturing true color imagery at 1 Hertz (Hz), resulting in image footprints with approximately 75-80% endlap, 60-70% sidelap, and a 5.3-centimeter (cm) ground sample distance (GSD). The precise time of each image capture (flash event) was recorded, and the corresponding aircraft position was computed during post-processing of the GNSS data; precise image positions can then be determined by accounting for the lever arm offsets between the aircraft GNSS antenna and the camera lens. Position data, provided as latitude/longitude/ellipsoid height, is referenced to the North American Datum of 1983 (NAD83(2011)).
Purpose:
These 15,366 aerial images were collected along the coast of the Outer Banks, North Carolina, with sufficient resolution and endlap/sidelap to produce Structure-from-Motion (SfM) photogrammetry products to capture the state of the coast five weeks after Hurricane Dorian's landfall.
Supplemental_Information:
These data were collected by the USGS Coastal and Marine Hazards and Resources Program under the USGS field activity number (FAN) 2019-312-CNT, and the associated field activity web page contains additional information regarding the field activity: https://cmgds.marine.usgs.gov/fan_info.php?fan=2019-312-CNT. Acquisition was timed to coincide with low tide along the beach areas to ensure the maximum shoreline extent was captured. Bounding coordinates for the aerial survey are derived from the overall flight path and are not necessarily representative of the imagery coverage.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20191011
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -76.53851727
East_Bounding_Coordinate: -75.46087935
North_Bounding_Coordinate: 36.26496054
South_Bounding_Coordinate: 34.56380961
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:e69faa86-a358-4e9b-abd0-621617efe785
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: structure from motion
Theme_Keyword: remote sensing
Theme_Keyword: aerial photography
Theme_Keyword: image collections
Theme_Keyword: geospatial datasets
Theme_Keyword: coastal processes
Theme_Keyword: geomorphology
Theme_Keyword: hurricanes
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Hazards and Resources Program
Theme_Keyword: CMHRP
Theme_Keyword: aerial imagery
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation
Theme_Keyword: imageryBaseMapsEarthCover
Theme_Keyword: oceans
Place:
Place_Keyword_Thesaurus: Geographic Names Information Service (GNIS)
Place_Keyword: North Carolina
Place_Keyword: Outer Banks
Place_Keyword: Albemarle Sound
Place_Keyword: Pamlico Sound
Place_Keyword: Duck
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Cape Hatteras National Seashore
Place_Keyword: Cape Lookout National Seashore
Temporal:
Temporal_Keyword_Thesaurus: None
Temporal_Keyword: October 2019
Temporal_Keyword: Post-Hurricane Dorian
Access_Constraints: none
Use_Constraints:
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator of the dataset and in products derived from these data.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Christine J. Kranenburg
Contact_Organization:
U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
Contact_Address:
Address_Type: Physical and Mailing
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727-502-8000
Contact_Electronic_Mail_Address: ckranenburg@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: 2019-10_NC_RegionalMap.jpg
Browse_Graphic_File_Description:
Regional map (which is included in 2019-10_NC_AreaMaps.zip) of the survey area along the Outer Banks, North Carolina, of post-Hurricane Dorian survey conducted during USGS field activity 2019-312-CNT.
Browse_Graphic_File_Type: JPG
Browse_Graphic:
Browse_Graphic_File_Name: 2019-10_NC_Area1.jpg
Browse_Graphic_File_Description:
This map, found within 2019-10_NC_AreaMaps.zip, shows the extent of Area 1 in the regional map for the post-Hurricane Dorian aerial images from Cape Lookout, North Carolina, to Cape Hatteras, North Carolina. The flight paths were divided into 3-minute latitudinal segments, represented by alternating purple and orange lines, and images for each segment are contained in zip files named according to the four-digit latitude (degree/minute) of the southern boundary. Some segments are further divided to limit the zip files to 20 GB and are identified by labels (a-c); all portions of a segment must be downloaded to ensure full coverage.
Browse_Graphic_File_Type: JPG
Browse_Graphic:
Browse_Graphic_File_Name: 2019-10_NC_Area2.jpg
Browse_Graphic_File_Description:
This map, found within 2019-10_NC_AreaMaps.zip, shows the extent of Area 2 in the regional map for the post-Hurricane Dorian aerial images from Cape Hatteras, North Carolina, to Duck, North Carolina. The flight paths were divided into 3-minute latitudinal segments, represented by alternating purple and orange lines, and images for each segment are contained in zip files named according to the four-digit latitude (degree/minute) of the southern boundary.
Browse_Graphic_File_Type: JPG
Data_Set_Credit:
Data collection was funded by the U.S. Geological Survey. The authors would like to thank pilot Wayne Wright of C.W. Wright Consulting for data acquisition and systems expertise.
Cross_Reference:
Citation_Information:
Originator: Hinck, J.E.
Originator: Stachyra, J.
Publication_Date: 2019
Title: 2019 Disaster Relief Act—USGS recovery activities
Series_Information:
Series_Name: U.S. Geological Survey Fact Sheet
Issue_Identification: 2019-3066
Online_Linkage: https://doi.org/10.3133/fs20193066
Cross_Reference:
Citation_Information:
Originator: Westoby, M.J.
Originator: Brasington, J.
Originator: Glasser, N.F.
Originator: Hambrey, M.J.
Originator: Reynolds, J.M.
Publication_Date: 2012
Title:
‘Structure-from-Motion’ photogrammetry: A low-cost, effective tool for geoscience applications
Series_Information:
Series_Name: Geomorphology
Issue_Identification: vol. 179
Publication_Information:
Publication_Place: Amsterdam, Netherlands
Publisher: Elsevier
Other_Citation_Details: pages 300-314
Online_Linkage: https://doi.org/10.1016/j.geomorph.2012.08.021
Cross_Reference:
Citation_Information:
Originator: Over, J.R.
Originator: Ritchie, A.C.
Originator: Kranenburg, C.J.
Originator: Brown, J.A.
Originator: Buscombe, D.
Originator: Noble, T.
Originator: Sherwood, C.R.
Originator: Warrick, J.A.
Originator: Wernette, P.A.
Publication_Date: 2021
Title:
Processing Coastal Imagery with Agisoft Metashape Professional Edition, Version 1.6—Structure from Motion Workflow Documentation
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: 2021-1039
Online_Linkage: https://doi.org/10.3133/ofr20211039
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The accuracy of the position data is based on the accuracy and precision of the GNSS equipment and camera timing, number and length of baselines and atmospheric conditions. Note that the positions in the image EXIF headers are aircraft GNSS antenna positions and are limited to six decimal places, whereas the positions in the external navigation file are accurate to ten decimal places and are therefore highly recommended for use in SfM processing to produce the highest quality derived products.
Logical_Consistency_Report: All data fall within expected ranges.
Completeness_Report:
This dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the entire metadata record carefully for additional details.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Positions provided in the aircraft navigation file (2019-10_NC_AircraftPositions.txt) have an estimated 2-sigma horizontal accuracy of 10 cm. The accuracy of the positions in the image EXIF headers are reduced due to field size limitations for storing latitude/longitude.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Positions provided in the aircraft navigation file (2019-10_NC_AircraftPositions.txt) have an estimated 2-sigma vertical accuracy of 15 cm.
Lineage:
Process_Step:
Process_Description:
IMAGE ACQUISITION C. W. Wright Consulting used a Sony A7R 36 Megapixel digital camera aboard a Piper P28A aircraft to conduct a nadir (vertical) aerial imagery survey from Cape Lookout, North Carolina, to Duck, North Carolina on October 11th, 2019, to document recovery conditions after the passage of Hurricane Dorian in September 2019. Data were collected to facilitate SfM processing (Westoby and others, 2012) in shore-parallel lines, flying at approximately 50 m/s and capturing true color imagery at 1 Hz, resulting in image footprints with approximately 75-80% endlap, 60-70% sidelap, and 5.3-cm GSD. A total of 15,366 raw (ARW) images, raw dual-frequency carrier phase GNSS data and photo event time data were delivered to the USGS St. Petersburg Coastal and Marine Science Center.
Process_Date: 20191011
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Christine J. Kranenburg
Contact_Organization:
U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
Contact_Position: Cartographer
Contact_Address:
Address_Type: Physical and Mailing
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727-502-8000
Contact_Electronic_Mail_Address: ckranenburg@usgs.gov
Process_Step:
Process_Description:
AIRCRAFT NAVIGATION PROCESSING Raw GNSS data received by the antenna mounted atop the aircraft were recorded at 1 Hz by a dual-frequency survey-grade GNSS receiver, which was post-processed and differentially corrected with no fewer than 5 continuously operating reference stations (CORS) using Novatel's GrafNav software (v. 8.80) to produce 1-Hz aircraft trajectories. The aircraft trajectories, in combination with precisely recorded image capture (flash event) times, are used to generate aircraft GNSS antenna positions at the moment of each image capture (2019-10_NC_AircraftPositions.txt). The positions in the aircraft navigation file represent the position of the aircraft GNSS antenna, not the position of the camera or features photographed. To determine actual image positions, photogrammetric software such as Agisoft Metashape can be used to apply the lever arm offsets (in the camera frame of reference) from the GNSS antenna reference point to the camera lens, which are 0.1 m, -0.15 m, and 1.25 m, in the x, y, and z directions respectively; see Over and others (2021) for details.
Process_Date: 20191113
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Christine J. Kranenburg
Contact_Organization:
U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
Contact_Position: Cartographer
Contact_Address:
Address_Type: Physical and Mailing
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727-502-8000
Contact_Electronic_Mail_Address: ckranenburg@usgs.gov
Process_Step:
Process_Description:
IMAGE PROCESSING & SAVING Images were received from the vendor in Sony RAW (ARW) format and converted to Joint Photographic Experts Group (JPG) format using Adobe Camera Raw (v. 13.2) and applying the Camera Neutral Profile. Image file names represent capture date, time stamp, and ancillary data, using the following convention: yyyy-mmdd-hhmmss-DSCnnnnn-N7251F.jpg where yyyy_mmdd represents the year (yyyy), month (mm) and day (dd) of capture; hhmmss is the time of capture as hours (hh), minutes (mm), seconds(ss) in Universal Coordinated Time (UTC); DSCnnnnn represents a sequential image ID generated by the camera; and N7251F is the tail number of the aircraft used for acquisition.
Process_Date: 20210529
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Andrew R. Ritchie
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Position: Geologist
Contact_Address:
Address_Type: Physical and Mailing
Address: 2885 Mission St.
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Country: USA
Contact_Voice_Telephone: 831-460-7454
Contact_Electronic_Mail_Address: aritchie@usgs.gov
Process_Step:
Process_Description:
IMAGE EXIF & SORTING Georeferencing, copyright, and other relevant information was added to the EXIF header of each photo using Phil Harvey’s ExifTool (v. 11.88). To extract the information from the image headers using ExifTool, the following command can be used (tested with ExifTool version 11.88): exiftool -csv -f -filename -GPSDateStamp -GPSTimeStamp -GPSLongitude -GPSLatitude -n -Artist -Credit -comment -keywords -Caption -Copyright -CopyrightNotice -Caption-Abstract -ImageDescription directoryname/*.jpg > out.csv The -csv flag writes the information out in a comma-delimited format. The -n option formats the latitude and longitude as signed decimal degrees. Images are sorted by latitude and contained within zip files according to 3-minute latitude segments of the coast (labeled based on the southern latitude boundary in degrees (DD) and minutes (mm) North (N), and further subdivided (labeled as -a/b/c) as needed to limit the overall file size.
Process_Date: 20211022
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Christine J. Kranenburg
Contact_Organization:
U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
Contact_Position: Cartographer
Contact_Address:
Address_Type: Physical and Mailing
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727-502-8000
Contact_Electronic_Mail_Address: ckranenburg@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000001
Longitude_Resolution: 0.000001
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983 (2011)
Ellipsoid_Name: GRS 1980
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257223563
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label:
2019-10_NC_AircraftPositions.txt (2019-10_NC_AircraftPositions.zip)
Entity_Type_Definition:
The tab-separated American Standard Code for Information Interchange (ASCII) text file, 2019-10_NC_AircraftPositions.txt, is included within 2019-10-NC_AircraftPositions.zip and contains the post-processed aircraft navigation GNSS data (position of the GNSS antenna at the moment of each image capture).
Entity_Type_Definition_Source: USGS
Attribute:
Attribute_Label: ImageName
Attribute_Definition:
File names of individual aerial images; see the Lineage section and IMAGE PROCESSING & SAVING Process_Description for file naming convention details.
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2019-1011-144848-DSC09597-N7251F.jpg
Range_Domain_Maximum: 2019-1011-203559-DSC00903-N7251F.jpg
Attribute:
Attribute_Label: Latitude
Attribute_Definition:
Latitude of aircraft GNSS antenna position at the moment of each image capture, in decimal degrees (NAD83(2011)).
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 34.56380961
Range_Domain_Maximum: 36.26496054
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: Longitude
Attribute_Definition:
Longitude of aircraft GNSS antenna position at the moment of each image capture, in decimal degrees (NAD83(2011)).
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -76.53851727
Range_Domain_Maximum: -75.46087935
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: Altitude
Attribute_Definition:
Altitude of aircraft GNSS antenna position at the moment of each image capture, in meters above the NAD83 ellipsoid.
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 210.689
Range_Domain_Maximum: 307.053
Attribute_Units_of_Measure: meters
Overview_Description:
Entity_and_Attribute_Overview:
Aerial Imagery (2019-10_NC_DDmmN-a/b/c.zip) – Individual aerial images are available in JPG format and are contained within ZIP files; see the Lineage section and IMAGE EXIF & SORTING Process_Step for more information on file naming and image sorting conventions.
Entity_and_Attribute_Overview:
Aircraft Position Data (2019-10_NC_AircraftPositions.zip) – The ZIP file contains a text (TXT) file of the precise post-processed GNSS position of the aircraft at the precise flash event time of each image; see the Entity_and_Attribute_Information section and Detailed_Description for more information on the variables reported in the TXT file, and see the Lineage section and AIRCRAFT NAVIGATION PROCESSING Process_Step for information on how to compute the precise image positions from the aircraft positions using photogrammetric software and applying lever arm offsets between the aircraft GNSS antenna and camera lens.
Entity_and_Attribute_Overview:
Area Maps (2019-10_NC_AreaMaps.zip) - The ZIP file contains a regional map and detailed area maps, available in JPG format, of individual coastline segments corresponding to the aerial imagery ZIP files within each survey subset area; see the Identification_Information section and Browse_Graphic text for additional information about the maps.
Entity_and_Attribute_Detail_Citation:
The entity and attribute information were generated by the individual and/or agency identified as the originator of the dataset. Please review the rest of the metadata record for additional details and information.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: SPCMSC Data Management Group
Contact_Organization:
U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
Contact_Address:
Address_Type: Physical and Mailing
Address: 600 4th St South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727-502-8000
Contact_Electronic_Mail_Address: gs-g-spcmsc_data_inquiries@usgs.gov
Distribution_Liability:
This publication was prepared by an agency of the United States Government. Although these data were processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: JPEG
Format_Information_Content:
JPEG images can be opened directly with any JPEG-compatible image viewer.
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Access_Instructions:
Aerial imagery, available in JPG format, can be downloaded per segment of coastline as zipped files from the data table of the data release landing page, which is accessed via the Network_Resource_Name link. The following link (https://coastal.er.usgs.gov/data-release/doi-P9RRSMOJ/data/2019-10_NC_DDmmN-a/b/c.zip) can be modified and used to directly obtain the data files: where DDmmN represents the southern boundary of the 3-degree latitude segment in degrees (DD) and minutes (mm) North (N), and the labels -a/b/c are used to further subdivide the segment as needed to limit the overall file sizes.
Digital_Form:
Digital_Transfer_Information:
Format_Name: tab-delimited text
Format_Information_Content:
TXT files can be opened directly with any text-editing software.
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information: Access_Instructions:
Aircraft navigation data, available in TXT format, can be downloaded as a ZIP file from the Network_Resource_Name link.
Digital_Form:
Digital_Transfer_Information:
Format_Name: JPEG
Format_Information_Content:
JPEG images can be opened directly with any JPEG-compatible image viewer.
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information: Access_Instructions:
A regional scale and detailed area maps, available in JPG format, can be downloaded as a ZIP file from the Network_Resource_Name link.
Fees: None.
Metadata_Reference_Information:
Metadata_Date: 20220121
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Christine J. Kranenburg
Contact_Organization:
U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
Contact_Position: Cartographer
Contact_Address:
Address_Type: Physical and Mailing
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727-502-8000
Contact_Electronic_Mail_Address: ckranenburg@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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