Logical_Consistency_Report:
All aerial images were acquired with one of the two 12-megapixel digital cameras (Canon Power Shot SX280 HS) mounted in the UAS. Two consecutive UAS missions were flown. The first flight (f1) was launched at approximately 1112 Eastern Standard Time (EST), and followed north-south flight lines, landing at about 1226 EST. Two 12-megapixel digital cameras (Canon Power Shot SX280 HS), designated rgb1 and rgb2 recorded images during this flight. The second flight (f2) was launched at 1320 EST and followed east-west flight lines, landing at 1450 EST. Prior to f2, rgb2 was replaced with a Canon SX280 modified with a Schott BG 3 filter to emphasize light at near-infrared wavelengths. This camera was designated nir1. Rgb1 and nir1 recorded images during this second flight. All images had a resolution of 4000 x 3000 pixels x 24 bits and were saved in JPEG format with compression level 6. The images included date, time, GPS location, and camera exposure information in the EXIF portion of the files. The dates and times are in Universal Time (UT). Images were contained in four directories, designated f1_rgb1, f1_rgb2, f2_rgb1, and f2_nir1. The directory naming convention denotes the flight number (f1 or f2) and camera number (rgb 1 or 2, or nir 1, where rgb indicates red-green-blue, and nir indicates near-infrared). Image names take the form of IMG_nnnn.JPG, where nnnn is an image number assigned by the camera. The camera automatically created a new directory and started renumbering images when the image number limit of 9999 was reached so, for a given flight, image numbers do not always start at 0001 and may not be sequential. In addition, the same image number (and image name) may occur in more than one flight.
Completeness_Report:
All images obtained during flights are included. Several images did not include altitude data in the EXIF information. The images with missing altitude data are:
f1_rgb1\IMG_9569.JPG;
f2_rgb1\IMG_1090.JPG, IMG_1320.JPG, IMG_1393.JPG, IMG_1394.JPG, IMG_1472.JPG, IMG_2183.JPG;
f2_nir1\IMG_0045.JPG, IMG_0119.JPG, IMG_0195.JPG, IMG_0311.JPG, IMG_0530.JPG, IMG_0754.JPG, IMG_8840.JPG, IMG_9783.JPG, IMG_9811.JPG, IMG_9813.JPG.
These images are assigned an altitude of -99.9 in the .CSV files.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal positions recorded in the EXIF portion of the images were derived from a u-blox 7 GNSS module, which receives signals from GPS and GLONASS satellites, but is otherwise uncorrected. Horizontal locations are nominally accurate to approximately 3 meters, but may be off by as much as 10 meters. Data were recorded in geographic coordinates in the GPS reference frame (WGS84) and subsequently converted to NAD83(2011) UTM Zone 19 North (meters). No quality assessment or quality control has been performed for these data.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Vertical positions recorded in the EXIF portion of the images were derived from a u-blox 7 GNSS module, which receives signals from GPS and GLONASS satellites, but is otherwise uncorrected. Vertical locations are less accurate than horizontal positions and may be off by 30 meters. Altitudes are in meters above sea level. No quality assessment or quality control has been performed for these data.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 2016
Title:
Low-altitude aerial imagery and related field observations associated with unmanned aerial systems (UAS) flights over Coast Guard Beach, Nauset Spit, Nauset Inlet, and Nauset Marsh, Cape Cod National Seashore, Eastham, Massachusetts on 1 March 2016 (JPEG images)
Type_of_Source_Media: raster digital data
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20160301
Source_Currentness_Reference:
ground condition; images were obtained during two low-altitude aerial flights between 1112 and 1450 EST on 20160301.
Source_Citation_Abbreviation: raw aerial images
Source_Contribution:
The images are the raw data from which the file names, time, and location were extracted.
Process_Step:
Process_Description:
Lists of the images in each of the four directories were made using a Python script (exif2track.py) that extracted date, time, latitude, longitude, and altitude from the EXIF portion of the images and used a Python version of PROJ4 software to convert the geographic coordinates (in WGS84) to NAD83(2011) coordinates in UTM Zone 19 North meters. Altitude is relative to mean sea level. The CSV file name corresponds to the image directory.
Source_Used_Citation_Abbreviation: raw aerial images
Process_Date: 20160520
Source_Produced_Citation_Abbreviation:
flight_1_rgb_1.csv, flight_1_rgb_2.csv, flight_2_nir_1.csv, flight_2_rgb_1.csv
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Christopher R. Sherwood
Contact_Position: Research Oceanographer
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2269
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: csherwood@usgs.gov
Process_Step:
Process_Description: USGS Thesaurus keywords added to the keyword section.
Process_Date: 20180720
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description:
Added keywords section with USGS persistent identifier as theme keyword.
Process_Date: 20200807
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
