Metadata: Identification_Information: Citation: Citation_Information: Originator: Joshua B. Logan Originator: Andrew W. Stevens Originator: Cordell D. Johnson Originator: Jessica R. Lacy Publication_Date: 20200817 Title: Aerial imagery from UAS survey of the Liberty Island Conservation Bank Wildlands restoration site, Sacramento-San Joaquin Delta, California, 2018-10-23 Geospatial_Data_Presentation_Form: JPEG Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9GF8R1M Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, California Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/P9GF8R1M Online_Linkage: https://www.sciencebase.gov/catalog/item/5eb210e782cefae35a29c45b Larger_Work_Citation: Citation_Information: Originator: Joshua B. Logan Originator: Andrew W. Stevens Originator: Cordell D. Johnson Originator: Jessica R. Lacy Publication_Date: 2020 Title: Aerial imagery and structure-from-motion derived data products from UAS survey of the Liberty Island Conservation Bank Wildlands restoration site, Sacramento-San Joaquin Delta, California, October 2018 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9GF8R1M Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/P9GF8R1M Online_Linkage: https://www.sciencebase.gov/catalog/item/5dcdc9fce4b069579760b11b Description: Abstract: This portion of the data release presents the raw aerial imagery collected during the Unmanned Aerial System (UAS) survey of the Liberty Island Conservation Bank Wildlands restoration site in the Sacramento-San Joaquin Delta on 2018-10-23. The imagery was acquired using two Department of Interior owned 3DR Solo quadcopters fitted with Ricoh GR II digital cameras featuring global shutters. The cameras were mounted using a fixed mount on the bottom of the UAS and oriented in a roughly nadir orientation. The UAS were flown on pre-programmed autonomous flight lines at an approximate altitude of 120 meters above-ground-level, resulting in a nominal ground-sample-distance (GSD) of 3.2 centimeters per-pixel. The flight lines were oriented roughly east-west and were spaced to provide approximately 66 percent overlap between images from adjacent lines. The cameras were triggered at 1 Hz using a built in intervalometer. After acquisition, the images were renamed to include flight number and acquisition time in the file name. The coordinates of the approximate image acquisition location were added ('geotagged') to the image metadata (EXIF) using the telemetry log from the UAS onboard single-frequency autonomous GPS. The image EXIF were also updated to include additional information related to the acquisition. Although the images were recorded in both JPG and camera raw (Adobe DNG) formats, only the JPG images are provided in this data release. The data release includes a total of 3,567 JPG images. Images from takeoff and landing sequences were not used for processing, and have been omitted from the data release. The images from each flight are provided in a zip file named with the flight number. Purpose: These data were collected in support of ongoing field experiments and numerical modeling by the USGS and others, with funding from the U.S. Bureau of Reclamation, to improve our understanding of habitat quality, the influence on various landscape features on ecosystem function, and the effects of restoration actions in the Sacramento–San Joaquin Delta. These data are intended for science researchers, students, policy makers, and the general public. Supplemental_Information: Additional information about the field activity from which these data were derived is available online at: http://cmgds.marine.usgs.gov/fan_info.php?fan=2018-676-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: Single_Date/Time: Calendar_Date: 20181023 Currentness_Reference: ground condition at time data were collected Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -121.6759 East_Bounding_Coordinate: -121.6675 North_Bounding_Coordinate: 38.3361 South_Bounding_Coordinate: 38.3254 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:5eb210e782cefae35a29c45b Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: elevation Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: Bathymetry and Elevation Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: topography Theme_Keyword: topographic maps Theme_Keyword: remote sensing Theme_Keyword: geomorphology Theme_Keyword: aerial photography Theme_Keyword: image mosaics Theme_Keyword: geospatial datasets Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: photography Theme_Keyword: remote sensing Theme_Keyword: fragile ecosystems Theme_Keyword: altimetry Theme_Keyword: wetland restoration 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: CHMRP Theme_Keyword: Pacific Coastal and Marine Science Center Theme_Keyword: PCMSC Theme_Keyword: UAS Theme_Keyword: Unmanned aerial system Theme_Keyword: Structure-from-motion Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Liberty Island Place_Keyword: Cache Slough Place_Keyword: State of California Place_Keyword: Sacramento River Place_Keyword: San Joaquin River Place_Keyword: Sacramento-San Joaquin Delta Place_Keyword: Sacramento River Deep Water Ship Channel 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(s) 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: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: https://www.sciencebase.gov/catalog/item/5eb210e782cefae35a29c45b?name=Wildlands_raw_image_browse.jpg Browse_Graphic_File_Description: Example aerial images from 2018-10-23 UAS survey. Browse_Graphic_File_Type: JPEG Cross_Reference: Citation_Information: Originator: Theresa A. Fregoso Originator: Andrew W. Stevens Originator: Rueen-Fang Wang Originator: Thomas Handley Originator: Peter Dartnell Originator: Jessica R. Lacy Originator: Eli Ateljevich Originator: Evan T. Dailey Publication_Date: 2020 Title: Bathymetry, topography, and acoustic backscatter data, and a digital elevation model (DEM) of the Cache Slough Complex and Sacramento River Deep Water Ship Channel, Sacramento-San Joaquin Delta, California Geospatial_Data_Presentation_Form: dataset Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, California Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/p9aqsrvh Online_Linkage: https://www.sciencebase.gov/catalog/item/5d702b8ae4b0c4f70cfa990f Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The Ricoh GR II cameras used to acquire these images produce a nominal image size of 16.2 megapixels in both JPG and camera raw (Adobe DNG) image formats. The image acquisition time stamp is recorded to the image metadata (EXIF) with a precision of 1 second. The UAS onboard GPS is a single-frequency autonomous receiver which records positions to the telemetry log at approximately 1-second intervals, with a approximate accuracy of 3 meters horizontally and 10 meters vertically. The geotagging operation uses the image time stamp to derive the image acquisition location by finding the nearest location recorded at the time of acquisition. To reduce the potential for timing errors during the geotagging process, the image time stamps were adjusted to true ('corrected') UTC time by comparing the image time stamps with several images taken of a smartphone app ('Emerald Time') showing accurate time from Network Time Protocol (NTP) servers. For camera 'RicohA' no image time adjustment was needed; for camera 'RicohB', +00:00:02 (2 seconds) were added to the image time to synchronize with corrected UTC time. The adjusted time stamp was only used for geotagging; the original image time stamp was retained in the image EXIF and file name. The positions stored in the EXIF are in the WGS84 (G1150) coordinate reference system (EPSG:7660), with elevation in meters relative to the WGS84 ellipsoid. Logical_Consistency_Report: Photographs were renamed using a custom python script to include flight number, image acquisition date and time in Universal Coordinated Time (UTC), camera ID, and original image ID number. The image EXIF were also updated to include additional information related to the acquisition. Some photographs may be auto-rotated by certain viewing software, but the original image orientation is the same for all images. Completeness_Report: Eight flights (F01 - F08) were conducted with two UAS during the survey. The imagery from each flight was stored separately, and the flights were renamed for organizational purposes; the acquisition times from F01 through F08 are not sequential. The cameras shutters were triggered at 1 Hz by an internal intervalometer which was started before takeoff and stopped after landing. Images from the takeoff and landing sequences were not used in data processing and are not included in this data release. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The horizontal positions stored in the EXIF image metadata were derived with a 'geotagging' process using the image time stamps and the uncorrected positions recorded in the telemetry log of the UAS from the onboard single-frequency autonomous GPS (mRobotics GPS u-Blox Neo-M8N / 3DR SOLO Upgrade). To reduce the potential for timing errors during the geotagging process, the image time stamps were adjusted to true ('corrected') UTC time by comparing the image time stamps with several images taken of a smartphone app ('Emerald Time') showing accurate time from Network Time Protocol (NTP) servers. The horizontal positions are estimated to be accurate to approximately 3 meters. However, it should be noted that for some images the error may exceed this estimate due to GPS errors or timing errors associated with the geotagging process. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The vertical positions stored in the EXIF image metadata were derived with a 'geotagging' process using the image time stamps and the uncorrected positions recorded in the telemetry log of the UAS from the onboard single-frequency autonomous GPS (mRobotics GPS u-Blox Neo-M8N / 3DR SOLO Upgrade). To reduce the potential for timing errors during the geotagging process, the image time stamps were adjusted to true ('corrected') UTC time by comparing the image time stamps with several images taken of a smartphone app ('Emerald Time') showing accurate time from Network Time Protocol (NTP) servers. The horizontal positions are estimated to be accurate to approximately 10 meters. However, it should be noted that for some images the error may exceed this estimate due to GPS errors or timing errors associated with the geotagging process. Lineage: Process_Step: Process_Description: Aerial imagery was collected using two Department of Interior owned 3DR Solo quadcopters fitted with Ricoh GR II digital cameras featuring global shutters. The cameras were mounted using a fixed mount on the bottom of the UAS and oriented in a roughly nadir orientation. The UAS were flown on pre-programmed autonomous flight lines at an approximate altitude of 120 meters above-ground-level. The flight lines were oriented roughly east-west and were spaced to provide approximately 66 percent overlap between images from adjacent lines. The cameras were triggered at 1 Hz using a built in intervalometer, and were programmed to simultaneously acquire imagery in both JPG and camera raw (Adobe DNG) formats. Due to the limited UAS battery life, a total of 8 flights were required to achieve full coverage of the study area. The flights were conducted on 2018-10-23 between 18:21 and 20:35 Universal Coordinated Time (UTC) (11:21 and 13:35 Pacific Daylight Time (PDT)). Before each flight, the camera digital ISO, aperture and shutter speed were manually set to adjust for ambient light conditions. Although these settings were changed between flights, they were not permitted to change during a flight; thus, the images from each individual flight were acquired with consistent camera settings. Process_Date: 20181023 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Joshua Logan Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Position: Physical Scientist Contact_Address: Address_Type: mailing address Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Country: US Contact_Voice_Telephone: 831-460-7519 Contact_Facsimile_Telephone: 831-427-4748 Contact_Electronic_Mail_Address: jlogan@usgs.gov Process_Step: Process_Description: The image files were renamed using a custom python script. The file names were formed using the following pattern Fx-YYYYMMDDThhmmssZ_Ryz.*, where: - Fx = Flight number - YYYYMMDDThhmmssZ = date and time in the ISO 8601 standard, where 'T' separates the date from the time, and 'Z' denotes UTC ('Zulu') time. - Ry = RA or RB to distinguish camera 'RicohA' from 'RicohB' - z = original image name assigned by camera during acquisition - * = file extension (JPG or DNG) The approximate image acquisition coordinates were added to the image metadata (EXIF) ('geotagged') using the image timestamp and the telemetry logs from the UAS onboard single-frequency 1-Hz autonomous GPS. The geotagging process was done using GeoSetter software. To improve timestamp accuracy, the image acquisition times were adjusted to true ('corrected') UTC time by comparing the image timestamps with several images taken of a smartphone app ('Emerald Time') showing accurate time from Network Time Protocol (NTP) servers. For RicohA no image time adjustment was needed; for RicohB, +00:00:02 (2 seconds) were added to the image time to synchronize with corrected UTC time. The positions stored in the EXIF are in geographic coordinates referenced to the WGS84(G1150) coordinate reference system (EPSG:7660), with elevation in meters relative to the WGS84 ellipsoid. Additional information was added to the EXIF using the command-line 'exiftool' software with the following command: exiftool ^ -P ^ -Copyright="Public Domain. Please credit U.S. Geological Survey." ^ -CopyrightNotice="Public Domain. Please credit U.S. Geological Survey." ^ -ImageDescription="Low-altitude aerial image of the Liberty Island Conservation Bank Wildlands restoration site, Cache Slough Complex, Sacramento-San Joaquin Delta, California, USA, from USGS survey 2018-676-FA" ^ -Caption-Abstract="Liberty Island Conservation Bank Wildlands restoration site, Cache Slough Complex, Sacramento-San Joaquin Delta, California, USA, from USGS survey 2018-676-FA" ^ -Caption="Liberty Island Conservation Bank Wildlands restoration site, Cache Slough Complex, Sacramento-San Joaquin Delta, California, USA, from survey 2018-676-FA" ^ -sep ", " ^ -keywords="Liberty Island, Liberty Island Conservation Bank, Wildlands restoration site, Cache Slough Complex, Sacramento-San Joaquin Delta, California, 2018-676-FA, Unmanned Aircraft System, UAS, aerial imagery, USGS, Pacific Coastal and Marine Science Center" ^ -comment="Low-altitude aerial image from USGS Unmanned Aircraft System (UAS) survey 2018-676-FA" ^ -Credit="U.S. Geological Survey" ^ -Contact="pcmsc_data@usgs.gov" ^ -Artist="Pacific Coastal and Marine Science Center" Process_Date: 2018 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Joshua Logan Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-460-7519 Contact_Electronic_Mail_Address: jlogan@usgs.gov Process_Step: Process_Description: Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. Process_Date: 20201019 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 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Pixel Row_Count: 3264 Column_Count: 4352 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: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257224 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: WGS84 Ellipsoid Altitude_Resolution: 0.01 Altitude_Distance_Units: meters Altitude_Encoding_Method: Attribute values Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: There are no additional attributes besides the tags described in data quality section associated with these images. Entity_and_Attribute_Detail_Citation: USGS Field Activity 2018-676-FA Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - ScienceBase Contact_Address: Address_Type: mailing address Address: Denver Federal Center, Building 810, Mail Stop 302 City: Denver State_or_Province: CO Postal_Code: 80225 Country: United States Contact_Voice_Telephone: 1-888-275-8747 Contact_Electronic_Mail_Address: sciencebase@usgs.gov Resource_Description: The aerial images from eight flights conducted during the UAS survey are available in JPG format. The images from each flight are combined into a zip file with the flight number in the file name. 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: JPEG Format_Information_Content: Zipped files contain geotagged aerial images acquired during a UAS survey by the U.S. Geological Survey. File_Decompression_Technique: WinZip, 7zip, Peazip or pkUnzip Transfer_Size: 1 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/5eb210e782cefae35a29c45b?name=F01_20181023_Wildlands_JPG_images.zip Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/5eb210e782cefae35a29c45b?name=F02_20181023_Wildlands_JPG_images.zip Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/5eb210e782cefae35a29c45b?name=F03_20181023_Wildlands_JPG_images.zip Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/5eb210e782cefae35a29c45b?name=F04_20181023_Wildlands_JPG_images.zip Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/5eb210e782cefae35a29c45b?name=F05_20181023_Wildlands_JPG_images.zip Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/5eb210e782cefae35a29c45b?name=F06_20181023_Wildlands_JPG_images.zip Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/5eb210e782cefae35a29c45b?name=F07_20181023_Wildlands_JPG_images.zip Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/5eb210e782cefae35a29c45b?name=F08_20181023_Wildlands_JPG_images.zip Network_Resource_Name: https://www.sciencebase.gov/catalog/item/5eb210e782cefae35a29c45b Network_Resource_Name: https://doi.org/10.5066/P9GF8R1M Access_Instructions: Data can be downloaded using the Network_Resource_Name links. The first eight links are direct link to the zip files for the images from each flight. Transfer sizes of the zip files range from 1.95 GB to 2.83 GB. The ninth link points to a landing page with the image zip files, metadata, and browse image. The last link points to the landing page for the entire data release, including links to pages of the various data files. Fees: None. Technical_Prerequisites: The downloadable data files are available in zipped JPG file format. Image processing and viewing software can be used to open and view the files. Metadata_Reference_Information: Metadata_Date: 20201019 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: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998