Metadata: Identification_Information: Citation: Citation_Information: Originator: Gerald A. Hatcher Originator: Jonathan A. Warrick Originator: Christine J. Kranenburg Originator: Peter Dal Ferro Publication_Date: 20210930 Title: GNSS locations of lakebed images collected near Dollar Point, Lake Tahoe, CA, March 10 and 11, 2021 Geospatial_Data_Presentation_Form: comma-delimited text file Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9V44ZYS Publication_Information: Publication_Place: Santa Cruz, California Publisher: U.S. Geological Survey - Pacific Coastal and Marine Science Center Online_Linkage: https://doi.org/10.5066/P9V44ZYS Larger_Work_Citation: Citation_Information: Originator: Gerald A. Hatcher Originator: Jonathan A. Warrick Originator: Christine J. Kranenburg Originator: Peter Dal Ferro Publication_Date: 2021 Title: Overlapping lakebed images and associated GNSS locations acquired near Dollar Point, Lake Tahoe, CA, March 2021 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9V44ZYS Publication_Information: Publication_Place: Santa Cruz, California Publisher: U.S. Geological Survey - Pacific Coastal and Marine Science Center Online_Linkage: https://doi.org/10.5066/P9V44ZYS Description: Abstract: This text file (2021-607-FA_Image_Locations.txt) provides the GNSS antenna location for underwater images collected near Dollar Point, Lake Tahoe, CA, using a recently developed towed-surface vehicle with multiple downward-looking underwater cameras. The GNSS antenna location for the time of each image capture is presented with greater precision than is stored in the individual image’s EXIF header due to decimal place limitations of the EXIF format. Purpose: The imagery and associated location data were collected to assess the accuracy, precision, and effectiveness of the new SQUID-5 camera platform to collect contiguous imagery for use in Structure-from-Motion (SfM) data processing of an area similar in size to an individual coral reef. Supplemental_Information: Additional information about the field activity from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-607-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20210310 Ending_Date: 20210311 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -120.10407 East_Bounding_Coordinate: -120.09931 North_Bounding_Coordinate: 39.18048 South_Bounding_Coordinate: 39.17705 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:ff50d186-7781-45d6-b1b3-3cbad0ddf07f Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: lake bed Theme_Keyword: Global Positioning System (GPS) observations Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: Distributions Theme_Keyword: Habitat Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: inlandWaters Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: lakebed characteristics Theme_Keyword: geospatial datasets Theme_Keyword: remote sensing Theme_Keyword: visible light imaging Theme_Keyword: structure from motion 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: Pacific Coastal and Marine Science Center Theme_Keyword: PCMSC Theme_Keyword: St. Petersburg Coastal and Marine Science Center Theme_Keyword: SPCMSC Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Lake Tahoe Place_Keyword: State of California 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. This information is not intended for navigation purposes. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Person: PCMSC Science Data Coordinator Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-460-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Native_Data_Set_Environment: Microsoft Windows 10 Cross_Reference: Citation_Information: Originator: Gerald A. Hatcher Originator: Jonathan A. Warrick Originator: Andrew C. Ritchie Originator: Evan T. Dailey Originator: David G. Zawada Originator: Christine Kranenburg Originator: Kimberly K. Yates Publication_Date: 2020 Title: Accurate bathymetric maps from underwater digital imagery without ground control Series_Information: Series_Name: Frontiers in Marine Science Issue_Identification: vol. 7 Other_Citation_Details: article 525 Online_Linkage: https://doi.org/10.3389/fmars.2020.00525 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The accuracy of the position data is based on the accuracy of the post-processed GNSS navigation data, which produced a 1-Hz vehicle trajectory with an estimated 2-sigma accuracy of 10 cm horizontal and 15 cm vertical. Note that the positions in the image EXIF headers are 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: Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Positions provided in the navigation file (2021-607-FA_Image_Locations.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 navigation file (2021-607-FA_Image_Locations.txt) have an estimated 2-sigma vertical accuracy of 15 cm. Lineage: Process_Step: Process_Description: SQUID-5 NAVIGATION PROCESSING Raw GNSS data received by the antenna mounted atop the SQUID-5 were recorded at 10 Hz by a dual-frequency survey-grade GNSS receiver, which was post-processed and differentially corrected against the Kings Beach, CA, (P150) continuously operating reference station (CORS) in Novatel's GrafNav software (v. 8.80.2720; https://novatel.com/products/waypoint-post-processing-software/grafnav) to produce 1-Hz SQUID-5 trajectories. The SQUID-5 trajectories, in combination with precisely recorded image capture event times, are used to generate SQUID-5 GNSS antenna positions at the moment of each image capture (2021-607-FA_Image_Locations.txt). The positions in the SQUID-5 navigation file represent the position of the SQUID-5 GNSS antenna reference point (ARP), not the position of the cameras 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. Using this method the following values for each camera were calculated for x,y,z in units of meters. Camera 13, 0.03536 m(x), -0.00407 m(y), 0.84721 m(z); Camera 30, -0.29259 m(x), -0.07655 m(y), 0.93223 m(z); Camera 39, 0.27623 m(x), -0.01498 m(y), 0.93657 m(z); Camera 82, -0.01679 m(x), -0.60744 m(y), 0.75020 m(z). Process_Date: 20210804 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: Performed minor edits to the metadata to correct typos. No data were changed Process_Date: 20211013 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Susan A. Cochran Contact_Position: Geologist Contact_Address: Address_Type: Mailing and Physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-460-7545 Contact_Electronic_Mail_Address: scochran@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Point Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 42940 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: 2021-607-FA_Image_Locations.txt Entity_Type_Definition: The comma-separated American Standard Code for Information Interchange (ASCII) text file, 2021-607-FA_Image_Locations.txtcontains the post-processed towed surface vehicle navigation GNSS data (position of the towed surface vehicle at the moment of each image capture. Entity_Type_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: ImageFile Attribute_Definition: File names of individual images. See the metadata file with the accompanying raw images for details on the file-naming convention. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Unique number for raw image. See the metadata file with the accompanying raw images for details on the file-naming convention. Attribute: Attribute_Label: Latitude Attribute_Definition: Latitude of towed surface vehicle GNSS antenna position at the moment of each image capture, in decimal degrees NAD83(2011). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 39.177100587 Range_Domain_Maximum: 39.180423155 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: Longitude Attribute_Definition: Longitude of towed surface vehicle GNSS antenna position at the moment of each image capture, in decimal degrees NAD83(2011). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -120.104027075 Range_Domain_Maximum: -120.099371104 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: Altitude Attribute_Definition: Altitude of towed surface vehicle GNSS antenna position at the moment of each image capture, in meters above the NAD83 ellipsoid. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1874.779 Range_Domain_Maximum: 1875.320 Overview_Description: Entity_and_Attribute_Overview: SQUID-5 towed surface vehicle Navigation Data (2021-607-FA_Image_Locations.txt) - Contains a text (TXT) file of the precise post-processed GNSS position of the towed surface vehicle at the precise initiation event time of each image capture; 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 towed surface vehicle NAVIGATION PROCESSING Process_Step for information on how to compute the precise image positions from the towed surface vehicle positions using photogrammetric software and applying lever arm offsets between the towed surface vehicle GNSS antenna and camera lens. Entity_and_Attribute_Detail_Citation: U.S. Geological Survey Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - CMGDS Contact_Address: Address_Type: Mailing and Physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 1-831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Resource_Description: SQUID-5 towed surface vehicle Navigation Data (2021-607-FA_Image_Locations.txt) - Contains a text (TXT) file of the precise post-processed GNSS position of the towed surface vehicle at the precise initiation event time of each image capture; 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 towed surface vehicle NAVIGATION PROCESSING Process_Step for information on how to compute the precise image positions from the towed surface vehicle positions using photogrammetric software and applying lever arm offsets between the towed surface vehicle GNSS antenna and camera lens. 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 on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: TXT Format_Information_Content: TXT files can be opened directly with any text-editing software. Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P9V44ZYS Access_Instructions: Antenna position data at the locations of image collection can be downloaded as a single text file at the Network_Resource_Name link. Fees: none Metadata_Reference_Information: Metadata_Date: 20211013 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Person: PCMSC Science Data Coordinator Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-460-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998