Metadata: Identification_Information: Citation: Citation_Information: Originator: Jin-Si R. Over Originator: Peter A. Traykovski Publication_Date: 20230725 Title: Low-altitude aerial imagery collected from a Helikite at Head of the Meadow Beach, Truro, MA on March 10, 2023 Edition: 1.0 Geospatial_Data_Presentation_Form: imagery and tabular digital data Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9FYVLCD Publication_Information: Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Hazards and Resources Program Online_Linkage: https://doi.org/10.5066/P9FYVLCD Online_Linkage: https://www.sciencebase.gov/catalog/item/646514f2d34ec179a83dc1c8 Larger_Work_Citation: Citation_Information: Originator: Jin-Si R. Over Originator: Chris R. Sherwood Originator: Peter A. Traykovski Publication_Date: 2023 Title: Topographic and bathymetric data, structure from motion imagery, and ground control data collected at Head of the Meadow Beach, Truro, Massachusetts in March and April 2023, U.S. Geological Survey Field Activity 2023-011-FA. Edition: 1.0 Geospatial_Data_Presentation_Form: digital files Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9FYVLCD Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Suggested citation: Over, J.R., Sherwood, C.R., and Traykovski, P.A., 2023, Topographic and bathymetric data, structure from motion imagery, and ground control data collected at Head of the Meadow Beach, Truro, Massachusetts in March and April 2023, U.S. Geological Survey Field Activity 2023-011-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P9FYVLCD. Online_Linkage: https://doi.org/10.5066/P9FYVLCD Online_Linkage: https://www.sciencebase.gov/catalog/item/6463d0ffd34ec179a83d2ff1 Description: Abstract: The data in this release re-map the beach and nearshore environment at Head of the Meadow Beach in Truro, MA and provide updated environmental context for the 2020 CoastCam installation that looks out at the coast shared by beachgoers, shorebirds, seals, and sharks. This is related to the field activity 2022-015-FA and a collaboration with the National Park Service at Cape Cod National Seashore to monitor the region that falls within the field of view of CoastCam CACO-01, which are two video cameras aimed at the beach. In March and April 2023, U.S. Geological Survey and Woods Hole Oceanographic Institute (WHOI) scientists conducted field surveys to collect topographic and bathymetric data. Images of the beach for use in structure-from-motion were taken with a camera (SONY a6000) and a post-processed kinematic (PPK) system attached to a helium powered balloon-kite (Helikite). High-precision GPS targets (AeroPoints) and numbered black and white tarps were used as ground control points. Bathymetry was collected in the nearshore using a single-beam echosounder mounted on a surf capable self-righting electric autonomous surface vehicle. Agisoft Metashape (v. 1.8.1) was used to create a digital surface model and orthomosaic with the collected imagery. Purpose: These RGB 3-band images were collected to map the beach and bluffs with sufficient overlap to produce structure-from-motion photogrammetry products. Each image has position information to speed up alignment in the photogrammetry processing. Supplemental_Information: For more information about the WHCMSC Field Activity, see https://cmgds.marine.usgs.gov/fan_info.php?fan=2023-011-FA. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20230310 Currentness_Reference: ground condition; one day of data collection on March 10, 2023 Status: Progress: Complete Maintenance_and_Update_Frequency: Not planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -70.07942169 East_Bounding_Coordinate: -70.07523059 North_Bounding_Coordinate: 42.04971420 South_Bounding_Coordinate: 42.05223817 Keywords: 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: Woods Hole Coastal and Marine Science Center Theme_Keyword: WHCMSC Theme_Keyword: shoreline Theme_Keyword: 3-band imagery Theme_Keyword: shoreline photographs Theme_Keyword: JPG Theme_Keyword: low-altitude aerial imagery Theme_Keyword: aerial imagery Theme_Keyword: UAS Theme_Keyword: Helikite Theme_Keyword: geotagged photos Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: aerial and satellite photography Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: remote sensing Theme_Keyword: aerial photography Theme_Keyword: image collections Theme_Keyword: geospatial datasets Theme_Keyword: photography Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme_Keyword: oceans Theme_Keyword: location Theme_Keyword: elevation Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:646514f2d34ec179a83dc1c8 Place: Place_Keyword_Thesaurus: Common geographic areas Place_Keyword: United States Place_Keyword: Massachusetts Place_Keyword: Truro Place_Keyword: Cape Cod Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Head of the Meadow Beach Access_Constraints: None Use_Constraints: 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. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jin-Si R. Over Contact_Organization: U.S. Geological Survey, Woods Hole Coastal and Marine Science Center Contact_Position: Geographer 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 x2297 Contact_Electronic_Mail_Address: jover@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: https://www.sciencebase.gov/catalog/file/get/646514f2d34ec179a83dc1c8?name=2023-011-FA_Truro_imagery_browse.JPG&allowOpen=true Browse_Graphic_File_Description: Photograph showing how the camera, GNSS, and antenna configuration attaches to the Helikite. Browse_Graphic_File_Type: JPEG Native_Data_Set_Environment: EXIF Tool v. 12.06, Emlid Studio v.1.4, Namexif v. 2.4 Cross_Reference: Citation_Information: Originator: Jin-Si R. Over Originator: Chris R. Sherwood Originator: Peter A. Traykovski Originator: Eric Marsjanik Publication_Date: 2022 Title: Topographic and bathymetric data, structure from motion imagery, and ground control data collected at Head of the Meadow Beach, Truro, MA in March 2022, U.S. Geological Survey Field Activity 2022-015-FA Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9GEVWG1 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: This publication is the latest survey data of Head of the Meadow Beach from 2022. Online_Linkage: https://doi.org/10.5066/P9GEVWG1 Cross_Reference: Citation_Information: Originator: Jin-Si R. Over Originator: Chris R. Sherwood Originator: Peter A. Traykovski Publication_Date: 2022 Title: Topographic and bathymetric data, structure from motion imagery, and ground control data collected at Head of the Meadow, Truro in February 2021, U.S Geological Survey Field Activity 2021-014-FA Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9D94NZ3 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: This publication is the survey data of Head of the Meadow Beach from 2021. Online_Linkage: https://doi.org/10.5066/P9D94NZ3 Cross_Reference: Citation_Information: Originator: Jin-Si R. Over Originator: Chris R. Sherwood Originator: Peter A. Traykovski Originator: Sandra M. Brosnahan Originator: Eric E. Marsjanik Originator: John S. Borden Publication_Date: 2021 Title: Topographic and bathymetric data, sediment samples, and beach imagery collected at Head of the Meadow, Truro in March 2020, U.S Geological Survey Field Activity 2020-015-FA Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9KSG1RQ Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: This publication is the survey data of Head of the Meadow Beach from 2020. Online_Linkage: https://doi.org/10.5066/P9KSG1RQ Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The camera (Sony a6000) used on the Helikite acquired 24 megapixel photos, with file sizes generally between 1 and 3 MB on disc, depending on image complexity. Some images were blurry due to movement and changing low light conditions. Logical_Consistency_Report: One flight was flown at a target elevation of 40-60 m to map the Head of the Meadow Beach shoreline and bluff face in Truro, MA, on March 10, 2023. Completeness_Report: Photographs were captured every 5 seconds but only 1025 are provided; images taken while the Helikite was launched and put away were removed. All photos included have location information. Due to tide and wind conditions the lower beach was not captured and the total area surveyed is smaller than previous surveys (see Cross References). Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Though the images do not represent spatial data, the spatial information is embedded in the photo and available in the EXIF header of each image, which is derived from the provided Helikite navigation file (2023011FA_Truro_f1_photoLocations.csv) in the larger work citation. The location information was acquired from a GNSS receiver (EMLID Reach M2) in PPK mode with a multi-band GNSS antenna and hot shoe adapter with an estimated horizontal accuracy of 2-10 cm. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Though the images do not represent spatial data, the spatial information is available in the EXIF header of each image, which is derived from the provided Helikite navigation file (2023011FA_Truro_f1_photoLocations.csv) in the larger work citation. The location information was acquired from a GNSS receiver (EMLID Reach M2) in PPK mode with a multi-band GNSS antenna and hot shoe adapter with an estimated vertical accuracy of 5-10 cm. Lineage: Process_Step: Process_Description: These JPEG images were collected with a camera (Sony a6000) wired to the GNSS receiver 15 cm vertically offset from the focal point and duct taped together, then hung from the Helikite (2023011FA_Truro_imagery_browse.JPG) so that the camera faced downward. The Helikite was on a 60 m string and kitesurfing harness; together the Helikite and gear were walked up and down the beach to achieve overlapping images. The horizontal positions and elevations of each image (2023011FA_Truro_f1_photoLocations.csv) were recorded from the GNSS receiver (EMLID Reach M2) and processed in PPK mode and processed using a base station set-up in the parking lot. It is recommended when using the imagery for photogrammetric purposes to also use the ground control point locations (see 2023011FA_Truro_nav_GCPs.csv). Process_Date: 202303 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Peter Traykovski Contact_Organization: Woods Hole Oceanographic Institution Contact_Position: Associate Scientist Contact_Address: Address_Type: mailing and physical address Address: 226 Woods Hole Rd, MS #12 City: Woods Hole State_or_Province: MA Postal_Code: 02543 Contact_Voice_Telephone: 508-289-2638 Contact_Electronic_Mail_Address: ptraykovski@whoi.edu Process_Step: Process_Description: The GNSS navigation data was processed in Emlid Studio (v 1.4) using the drone data processing workflow. The positions were processed in the NAD83(2011) datum, which provided the Latitude, Longitude, and Ellipsoid attributes. Then Geoid 18B was applied using NAVD88 as the vertical datum and UTM Zone 19N for the horizontal coordinate reference system to produce the Northing, Easting, and Altitude attributes. The GPS offset was not accounted for in this step so the offset should be accounted for when deriving further products. All of the attributes here are provided in the 2023011FA_Truro_f1_photoLocations.csv but only the latitude, longitude, and altitude (NAVD88) were embedded in the image header using Emlid Studio. Process_Date: 202204 Process_Step: Process_Description: 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. For more information on the EXIF tags here and automatically populated by the camera see https://exiftool.org/TagNames/EXIF.html 1. Using the GNSS navigation from the previous step, ExifTools was used to tag each photo with the following tags: Credit, Copyright, UsageTerms, ImageDescription, Artist, XMP:ExternalMetadataLink, XMP:UsageTerms, XMP:AttributionURL, XMP:PreservedFilename, GPSTimeStamp, GPSAltitudeRef, GPSLatitudeRef, GPSLongitudeRef, GPSAreaInfo, GPSMapDatum, GPSLatitude, GPSLongitude, and GPSAltitude stored in a CSV file with the command:' -exiftool -csv="C:\directory\name\Geotags_EXIF.csv" C:\directory\name\of\photos *.JPG The first row of the CSV are the tag names; the first column is SourceName (unique image names). Keywords were added with the following command in the directory with all the photographs: exiftool -keywords="aerial imagery" -keywords="Head of the Meadow Beach" -keywords=Massachusetts -keywords="2023-011-FA" -keywords=USGS -overwrite_original *.JPG To read out the photo information to a CSV when in the directory with the photos the command is: exiftool -csv *.JPG > directory/name/allheaders_out.csv 2. All the JPEG images were renamed with Namexif (https://us.digicamsoft.com/softnamexif.html v 2.2 accessed April 2020) 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 the field survey ID prefix; flight number, and ID that distinguishes USGS cameras by make/camera number, the image acquisition date, coordinated universal time (UTC) in ISO8601 format, and a suffix with the original image name. For example, image name '2023011FA_f01s6000_20230310T165822Z_image####.jpg', 2023011FA is the survey ID, f01 is the flight number, s6000 is the camera make (SONY) and model (6000), and 20230310 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 image####.jpg is the original raw photo name appended to the end of the new filename. Process_Date: 202305 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jin-Si R. Over Contact_Organization: U.S. Geological Survey, Woods Hole Coastal and Marine Science Center Contact_Position: Geographer Contact_Address: Address_Type: mailing and physical address Address: U.S. Geological Survey Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2297 Contact_Electronic_Mail_Address: jover@usgs.gov Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.00000001 Longitude_Resolution: 0.00000001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 (National Spatial Reference System 2011) Ellipsoid_Name: GRS_1980 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257222101 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum of 1988 Altitude_Resolution: 0.001 Altitude_Distance_Units: meters Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: 2023011FA_Truro_f1.zip contains 1,025 photos. Entity_Type_Definition: JPEG photos taken from the SONY a6000. Entity_Type_Definition_Source: USGS Detailed_Description: Entity_Type: Entity_Type_Label: 2023011FA_Truro_f1_photoLocations.csv contains 1,025 data records. Entity_Type_Definition: The CSV file contains the post-processed Helikite navigation GNSS data (approximate position of the camera at the moment of each image capture). Entity_Type_Definition_Source: USGS Attribute: Attribute_Label: ImageName Attribute_Definition: File names of individual images, see the Data_Quality_Information and Process_Description for file naming convention. Attribute_Definition_Source: USGS Attribute_Domain_Values: Unrepresentable_Domain: Character string. Attribute: Attribute_Label: Date Attribute_Definition: Date photos were collected in YYYYMMDD Attribute_Definition_Source: Processor defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 20230310 Range_Domain_Maximum: 20230310 Attribute_Units_of_Measure: YYYYMMDD Attribute: Attribute_Label: Time_UTC Attribute_Definition: Time in HH:MM:SS of the camera position based on the GPS in coordinated universal time (UTC). Attribute_Definition_Source: Processor defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 17:55:56 Range_Domain_Maximum: 18:56:33 Attribute_Units_of_Measure: HH:MM:SS UTC Attribute: Attribute_Label: Latitude NAD83[2011] Attribute_Definition: Post-processed interpolated latitude of kite GNSS antenna position based on time of each image capture, in decimal degrees (NAD83[2011]). Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 42.04971420 Range_Domain_Maximum: 42.05223817 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: Longtitude NAD83[2011] Attribute_Definition: Post-processed interpolated longitude of kite GNSS antenna position based on time of each image capture, in decimal degrees (NAD83[2011]). Attribute_Definition_Source: None Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -70.07942169 Range_Domain_Maximum: -70.07523059 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: Ellipsoid NAD83[2011] Attribute_Definition: Post-processed height in meters of kite GNSS antenna position based on time of each image capture based on the NAD83(2011) reference ellipsoid. Attribute_Definition_Source: None Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -10.210 Range_Domain_Maximum: 25.963 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: Northing 19N Attribute_Definition: Post-processed X-coordinate of kite GNSS antenna position based on time of each image capture, in NAD83(2011)/UTM Zone 19N. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 4655856.220 Range_Domain_Maximum: 4656139.176 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: Easting 19N Attribute_Definition: Post-processed Y-coordinate of kite GNSS antenna position based on time of each image capture, in NAD83(2011)/UTM Zone 19N. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 410676.799 Range_Domain_Maximum: 411021.810 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: Orthometric NAVD88 Attribute_Definition: Post-processed Z-coordinate of kite GNSS antenna position based on time of each image using NAVD88 correction with Geoid 18. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 17.374 Range_Domain_Maximum: 53.551 Attribute_Units_of_Measure: meters Overview_Description: Entity_and_Attribute_Overview: The attributes Latitude, Longitude, and Orthometric NAVD88 were included in the image headers as GPSLatitude, GPSLongitude, and GPSAltitude, respectively. A GPSMapDatum header was also included in the images specifying that the latitude and longitude are in NAD83(2011) and altitude is in NAVD88 Geoid18. Positions were derived from an Emlid Reach PPK GNSS receiver. Entity_and_Attribute_Detail_Citation: USGS Field Activity 2023-011-FA Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - ScienceBase Contact_Address: Address_Type: mailing and physical address Address: Denver Federal Center, Building 810, Mail Stop 302 City: Denver State_or_Province: CO Postal_Code: 80225 Contact_Voice_Telephone: 1-888-275-8747 Contact_Electronic_Mail_Address: sciencebase@usgs.gov Resource_Description: The Windows 10 zip file 2023011FA_Truro_f1.zip contains 1,025 JPEG images and 2023011FA_Truro_f1_photolocations.csv contains the PPK GNSS navigation data. Distribution_Liability: Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: JPEG Format_Version_Number: 1.0.0 Format_Specification: JPEG Format_Information_Content: The 2023011FA_Truro_f1.zip file contains 1,025 JPEGs File_Decompression_Technique: Use WinZip, 7zip, Peazip or pkUnzip Transfer_Size: 2390 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/item/646514f2d34ec179a83dc1c8 Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/646514f2d34ec179a83dc1c8 Network_Resource_Name: https://doi.org/10.5066/P9FYVLCD Access_Instructions: The first link in the list above is to the child page where files can be downloaded individually, the second link is to directly download all the data on the page, and the third link is the doi to the main publication. Note that the imagery zip file is over 2 GB so if the second link is not currently supported, use the first link to choose files to download. Digital_Form: Digital_Transfer_Information: Format_Name: CSV Format_Version_Number: Exported from Excel Office 365 16.01 Format_Information_Content: The CSV file 2023011FA_Truro_f1_photoLocations.csv contains photo location information. Transfer_Size: 0.03 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/item/646514f2d34ec179a83dc1c8 Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/646514f2d34ec179a83dc1c8 Network_Resource_Name: https://doi.org/10.5066/P9FYVLCD Access_Instructions: The first link in the list above is to the child page where files can be downloaded individually, the second link is to directly download all the data on the page, and the third link is the doi to the main publication. Note that the imagery zip file is over 2 GB so if the second link is not currently supported, use the first link to choose files to download. Fees: none Technical_Prerequisites: Use of these files requires software capable of opening JPEG images and, if desired, capable of reading the associated EXIF information. Additionally, the location information is provided in a CSV file for the user to utilize with appropriate software. Metadata_Reference_Information: Metadata_Date: 20230725 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jin-Si R. Over Contact_Organization: U.S. Geological Survey, Woods Hole Coastal and Marine Science Center Contact_Position: Geographer Contact_Address: Address_Type: mailing and physical Address: U.S. Geological Survey Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2297 Contact_Electronic_Mail_Address: whsc_data_contact@usgs.gov Contact_Instructions: The metadata contact email address is a generic address in the event the person is no longer with USGS. Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time