Orthomosaic imagery for Whiskeytown Lake and surrounding area, northern California, 2019-11-12

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Joshua B. Logan
Originator: Amy E. East
Originator: Andrew C. Ritchie
Publication_Date: 20210702
Title:
Orthomosaic imagery for Whiskeytown Lake and surrounding area, northern California, 2019-11-12
Geospatial_Data_Presentation_Form: GeoTIFF
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9HEDYNT
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/P9HEDYNT
Online_Linkage: Larger_Work_Citation:
Citation_Information:
Originator: Joshua B. Logan
Originator: Peter Dartnell
Originator: Amy E. East
Originator: Andrew C. Ritchie
Publication_Date: 20200527
Title:
Bathymetry, topography and orthomosaic imagery for Whiskeytown Lake, northern California
Edition: 2.0
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9HEDYNT
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/P9HEDYNT
Online_Linkage:
Description:
Abstract:
This portion of the data release presents an RGB orthomosaic image of Whiskeytown Lake and the surrounding area derived from Structure from Motion (SfM) processing of aerial imagery acquired on 2019-11-12. The orthomosaic is available in a high-resolution 6-centimeter (cm) version, as well as a medium-resolution 25 cm version. The high-resolution version is divided into two tiles (east and west) to reduce file download sizes. All imagery is provided in a three-band cloud optimized GeoTIFF format, with 8-bit unsigned integer values compressed using high-quality JPEG compression. The raw imagery used to create the orthomosaic image was acquired from a manned aircraft on 2019-11-12. The acquisition flight was conducted by The 111th Group Aerial Photography, using a Hasselblad A6D-100c camera. The imagery was acquired from an approximate altitude of 880 meters (2,900 feet) above ground level, to produce a nominal ground sample distance (pixel size) of 5 centimeters (2 inches). An onboard dual-frequency GPS receiver was used to record the precise time and position of each image. Coordinates for ground control points consisting of photo-identifiable objects were measured independently using survey-grade post-processed kinematic (PPK) GPS.
Purpose:
This RGB orthomosaic image was created to help evaluate the initial post-fire conditions on the exposed margins of Whiskeytown Lake as well as the exposed, unvegetated portions of the surrounding watersheds. It is intended for use by scientists, managers, and the general public. The orthomosaic can be used with geographic information systems (GIS) software for research purposes.
Supplemental_Information:
Additional information about the field activities from which these data were derived is available online at:
http://cmgds.marine.usgs.gov/fan_info.php?fan=2019-660-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Data used in creating this data product were collected under the Department of the Interior, National Park Service Scientific Research and Collecting Permit WHIS-2018-SCI-0023 and WHIS-2019-SCI-0011.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20191112
Ending_Date: 20191112
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: -122.66726
East_Bounding_Coordinate: -122.49398
North_Bounding_Coordinate: 40.68498
South_Bounding_Coordinate: 40.56443
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation
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: fires
Theme:
Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: photography
Theme_Keyword: remote sensing
Theme_Keyword: fragile ecosystems
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: reservoir
Theme_Keyword: wildfires
Theme_Keyword: Carr fire
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:605258afd34e7eb1cb3eb47f
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: State of California
Place_Keyword: Whiskeytown-Shasta-Trinity National Recreation Area
Place_Keyword: Whiskeytown Lake
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: Browse_Graphic_File_Description: RGB orthomosaic image from 2019-11-12.
Browse_Graphic_File_Type: PNG
Data_Set_Credit:
Data collection was funded by the U.S. Geological Survey. Data acquisition was conducted by The 111th Group Aerial Photography. Data processing was done by the U.S. Geological Survey.
Native_Data_Set_Environment:
Microsoft Windows 10, Agisoft PhotoScan version 1.4.4 through Agisoft Metashape 1.5.3, QGIS 3.04 through 3.12, and GDAL 3.0.4 through 3.1.0, Hasselblad Phocus 3.4.7, Novatel GrafNav 8.8.
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: No formal attribute accuracy tests were conducted.
Logical_Consistency_Report: No formal logical accuracy tests were conducted.
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:
Horizontal positional accuracy was evaluated by comparing the positions of 26 independent photo-identifiable ground control check points measured with survey-grade post-processed kinematic (PPK) GPS with their estimated positions derived from the structure from motion (SfM) processing workflow. The root-mean-square error (RMSE) of the residual values of the measured positions versus the SfM-estimated positions was 0.071 meters. It should be noted that this estimate is for unvegetated, bare ground areas only. Additional sources of error such as noise or blurriness within the source imagery, poor terrain reconstruction in areas of uniform color and texture such as roads and parking lots, poor terrain reconstruction on small islands surrounded by water, and vegetation artifacts may cause additional errors in portions of the DSM which likely exceed the stated uncertainty bounds.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Vertical positional accuracy was not evaluated for this data product.
Lineage:
Process_Step:
Process_Description:
Aerial imagery was collected by the 111th Group, Inc. on 2019-11-12 between 20:34 and 22:16 Universal Coordinated Time (UTC) (12:34 to 14:16 Pacific Standard Time (PST)), using a Hasselblad A6D-100c mounted in a nadir orientation. The imagery was acquired from an approximate altitude of 890 meters (2,920 feet) above ground level, to produce a nominal ground sample distance (pixel size) of 5 centimeters (2 inches). A total of 1,734 images were acquired in the survey area, with an approximate 70 percent along-line image overlap (forelap) and 50 percent side-to-side overlap (sidelap). An onboard dual-frequency GPS receiver was used to record the precise shutter time and position of each image.
Process_Date: 20191112
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Patrick Belanger
Contact_Organization: The 111th Group Inc
Contact_Address:
Address_Type: mailing and physical
Address: 13025 Murphy Ave. Suite 100
City: San Martin
State_or_Province: CA
Postal_Code: 95046
Contact_Voice_Telephone: 408-683-9111
Contact_Electronic_Mail_Address: pat@the111th.com
Process_Step:
Process_Description:
The GPS data from the aircraft onboard dual-frequency GPS was post processed using Precise Point Positioning (PPP) in the Novatel GrafNav GNSS post-processing software package. Precise positions for camera shutter event marks were interpolated using the Grafnav Camera Event Mark tool and exported in NAD83(2011) spherical and projected coordinates.
Process_Date: 2019
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:
Ground control was established by measuring the positions of approximately 68 photo-identifiable marks or objects using survey-grade post-processed-kinematic (PPK) GPS equipment. All measurements were referenced to a static base station operating on a temporary benchmark within the survey area. The position of the base station was established using the National Geodetic Survey Online Positioning User Service (OPUS).
Process_Date: 20191029
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:
Imagery from the raw Hasselblad 3FR format was converted to Hasselblad FFF format using the Hassleblad Phocus software package. The imagery exposure value (EV) was increased by +0.25 stops, and the chromatic aberration and vignetting corrections were applied under the Lens Correction tab. The distortion correction was not applied. The resulting adjusted images were exported using the JPG Max profile (JPG with Quality set to Maximum).
Process_Date: 2020
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:
Structure from Motion (SfM) processing techniques were used to create the Digital Surface Model and Orthomosaic in the Agisoft Photoscan/Metashape software package using the following work flow: 1. The aerial imagery was loaded into Agisoft, and the camera positions were updated using the PPP post-processed onboard GPS data. 2. Initial image alignment was performed with the following parameters - Accuracy: 'high'; Pair selection: 'reference', 'generic'; Key point limit: 0 (unlimited); Tie point limit: 0 (unlimited). 3. Optimization and lens calibration parameters f, cx, cy, k1, k2, k3, p1, and p2 were included. 4. Ground control points (GCPs) previously measured with PPK GPS were manually identified and placed in the imagery. 5. Sparse point cloud error reduction was performed using an iterative gradual selection and camera optimization process with the following parameters: Reconstruction Uncertainty: 10; Projection Accuracy: 3; Reconstruction Error: 0.3. 6. A dense point cloud was created using the 'high' accuracy setting, with 'aggressive' depth filtering. 7. An initial Digital Surface Model (DSM) with a native resolution of 0.111 meters per pixel was created using points from the dense point cloud. An exterior boundary was digitized and used as a clipping mask to exclude obvious edge artifacts and large areas of interpolation. The DSM was exported to a GeoTIFF format with a 0.250-meter pixel resolution. 8. An RGB orthomosaic with a native resolution of 0.059 meters per pixel was created using the DSM as the orthorectification surface. The orthomosaic was exported to a GeoTIFF format at two resolutions: 0.060-meter pixels, and 0.250-meter pixels. 9. The RGB orthomosaic was converted to a cloud optimized GeoTIFF format for compatibility with cloud storage services using the GDAL software package. The orthomosaic was scaled to byte values and compressed using JPEG compression, with a quality of 90. The higher-resolution orthomosaic was divided into an east and west tile to reduce the file size, while the lower-resolution version was kept as one file.
Process_Date: 2020
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
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 10
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -123.00000
Latitude_of_Projection_Origin: 0.00000
False_Easting: 500000.0
False_Northing: 0.00
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.250
Ordinate_Resolution: 0.250
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983, 2011 realization (NAD83(2011)).
Ellipsoid_Name: GRS 1980
Semi-major_Axis: 6378137.00
Denominator_of_Flattening_Ratio: 298.257222101
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: GeoTIFF
Entity_Type_Definition: GeoTIFF containing RGB color bands.
Entity_Type_Definition_Source: Producer defined
Attribute:
Attribute_Label: Band_1
Attribute_Definition: Red band
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 255
Attribute:
Attribute_Label: Band_2
Attribute_Definition: Green band
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 255
Attribute:
Attribute_Label: Band_3
Attribute_Definition: Blue band
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 255
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey - ScienceBase
Contact_Address:
Address_Type: mailing and physical
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 RGB orthomosaic images are available as Cloud Optimized GeoTIFF files in two resolutions. High resolution 6 cm (Whiskeytown_2019-11-12_orthomosaic_6cm_east.tif and Whiskeytown_2019-11-12_orthomosaic_6cm_west.tif), and medium resolution 25 cm (Whiskeytown_2019-11-12_orthomosaic_25cm.tif).
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: GeoTIFF
Format_Version_Number: GDAL 3.1.0dev
Format_Information_Content:
Cloud Optimized GeoTIFF contains a medium-resolution (25 cm) three-band RGB orthomosaic with 8-bit unsigned integer values stored with high quality JPEG compression (Whiskeytown_2019-11-12_orthomosaic_25cm.tif).
File_Decompression_Technique: none
Transfer_Size: 335.5
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information: Access_Instructions:
Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the 25-cm orthomosaic. The second link is for accessing the orthomosaic on cloud-based storage and can be used for cloud-based queries or viewing. The third link points to a landing page with all the orthomosaics, metadata, and a browse image. The fourth link points to the landing page for the entire data release, including links to pages of the various data files.
Digital_Form:
Digital_Transfer_Information:
Format_Name: GeoTIFF
Format_Version_Number: GDAL 3.1.0dev
Format_Information_Content:
Cloud Optimized GeoTIFF contains a high-resolution (6 cm) three-band RGB orthomosaic with 8-bit unsigned integer values stored with high quality JPEG compression, (east tile: Whiskeytown_2019-11-12_orthomosaic_6cm_east.tif).
File_Decompression_Technique: none
Transfer_Size: 2520
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information: Access_Instructions:
Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the 6-cm east orthomosaic. The second link is for accessing the orthomosaic on cloud-based storage and can be used for cloud-based queries or viewing. The third link points to a landing page with all the orthomosaics, metadata, and a browse image. The fourth link points to the landing page for the entire data release, including links to pages of the various data files.
Digital_Form:
Digital_Transfer_Information:
Format_Name: GeoTIFF
Format_Version_Number: GDAL 3.1.0dev
Format_Information_Content:
Cloud Optimized GeoTIFF contains a high-resolution (6 cm) three-band RGB orthomosaic with 8-bit unsigned integer values stored with high quality JPEG compression, (west tile: Whiskeytown_2019-11-12_orthomosaic_6cm_west.tif).
File_Decompression_Technique: none
Transfer_Size: 2470
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information: Access_Instructions:
Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the 6-cm west orthomosaic. The second link is for accessing the orthomosaic on cloud-based storage and can be used for cloud-based queries or viewing. The third link points to a landing page with all the orthomosaics, metadata, and a browse image. The fourth link points to the landing page for the entire data release, including links to pages of the various data files.
Fees: None.
Technical_Prerequisites:
These data can be viewed with GIS software or other software capable of displaying geospatial raster data.
Metadata_Reference_Information:
Metadata_Date: 20210702
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

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