Joshua B. Logan
Amy E. East
20230111
Ground control point locations for the UAS survey of the Los Padres Reservoir delta, Carmel River valley, CA, 2017-11-01
comma-delimited text
data release
DOI:10.5066/P9TO24SR
Pacific Coastal and Marine Science Center, Santa Cruz, California
U.S. Geological Survey
https://doi.org/10.5066/P9J9CHOH
https://www.sciencebase.gov/catalog/item/638a95ced34ed907bf79095e
Joshua B. Logan
Amy E. East
2023
Aerial imagery and structure-from-motion data products from a UAS survey of the Los Padres Reservoir delta, Carmel River valley, CA, 2017-11-01
data release
DOI:10.5066/P9J9CHOH
Pacific Coastal and Marine Science Center, Santa Cruz, CA
U.S. Geological Survey
https://doi.org/10.5066/P9J9CHOH
https://www.sciencebase.gov/catalog/item/63728580d34ed907bf6c6a0f
This portion of the data release presents the locations of the temporary ground control points (GCPs) used for the structure-from-motion (SfM) processing of the imagery collected during the unoccupied aerial system (UAS) survey of the Los Padres Reservoir delta, Carmel River valley, CA, 2017-11-01. Twenty temporary ground control points (GCPs) consisting of small square tarps with black-and-white cross patterns were distributed throughout the area to establish survey control. The GCP positions were measured using real-time kinematic (RTK) GPS, using corrections from a GPS base station located on a benchmark designated SFML, located approximately 1 kilometer from the study area. The GCP positions are presented in a comma-delimited text file.
These data are intended to be used to characterize the position, elevation, volume, and morphology of the Los Padres Reservoir delta sediment where the Carmel River enters the reservoir. This assessment of reservoir sediment was made in response to the 2016 Soberanes Fire in the upper Carmel watershed, followed by high flows during water year 2017.
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=2017-635-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
20171101
ground condition at time data were collected
None planned
-121.66731
-121.66118
36.38117
36.37326
ISO 19115 Topic Category
elevation
geoscientificInformation
USGS Metadata Identifier
USGS:638a95ced34ed907bf79095e
Data Categories for Marine Planning
Bathymetry and Elevation
USGS Thesaurus
topography
topographic maps
remote sensing
geomorphology
aerial photography
image mosaics
geospatial datasets
structure from motion
Marine Realms Information Bank (MRIB) keywords
photography
remote sensing
aerial and satellite photography
altimetry
orthophotography
None
U.S. Geological Survey
USGS
Coastal and Marine Hazards and Resources Program
CHMRP
Pacific Coastal and Marine Science Center
PCMSC
Unmanned aerial system
UAS
Structure-from-motion
SfM
Geographic Names Information System (GNIS)
State of California
Carmel River
Monterey County
None
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.
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
https://www.sciencebase.gov/catalog/file/get/638a95ced34ed907bf79095e?name=F03_20171101T201127Z_RB000585_browse.jpg&allow=openTrue
Aerial image showing a ground control point used for the UAS survey.
JPEG
Microsoft Windows 10, Trimble Access, Trimble Business Center.
Smith, D.P.
Kvitek, R.
Aiello, I.
Iampietro, P.
Quan, C.
Paddock, E.
Endris, C.
Gomez, K.
2009
Fall 2008 Stage-Volume Relationship for Los Padres Reservoir, Carmel Valley, California: Prepared for the Monterey Peninsula Water Management District
Smith, D.P., Kvitek, R., Aiello, I., Iampietro, P., Quan, C., Paddock, E., Endris, C, and Gomez, K., 2009, Fall 2008 Stage-Volume Relationship for Los Padres Reservoir, Carmel Valley, California: Prepared for the Monterey Peninsula Water Management District. The Watershed Institute, California State University Monterey Bay, Publication no. WI-2009-2, 30 pp.
https://ccows.csumb.edu/pubs/reports/CCoWS_MPWMD_LosPadres_StageVol_2008_090508.pdf
No formal attribute accuracy tests were conducted.
No formal logical accuracy tests were conducted.
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.
GCP positions were measured using a survey-grade dual-frequency GPS receiver operating in real-time kinematic (RTK) mode. The GPS receiver was placed on a fixed-height tripod and set to occupy each GCP for a minimum occupation time of one minute. The RTK corrections were referenced to a GPS base station located on a benchmark designated SFML, located approximately 1 kilometer from the study area. The mean reported horizontal precision of these measurements was 0.008 meters. The reported horizontal peak-to-peak error reported for the base station position from NGS OPUS was 0.015, suggesting a total horizontal accuracy of about 0.020 meters. Uncertainty in the horizontal positions associated with tripod centering, antenna height measurement errors, and errors from the weight of the rover tripod settling onto the GCP tarp during data collection, and possible subsequent rebound of the center of the tarp after removal is unknown.
GCP positions were measured using a survey-grade dual-frequency GPS receiver operating in real-time kinematic (RTK) mode. The GPS receiver was placed on a fixed-height tripod and set to occupy each GCP for a minimum occupation time of one minute. The RTK corrections were referenced to a GPS base station located on a benchmark designated SFML, located approximately 1 kilometer from the study area. The mean reported vertical precision of these measurements was 0.012 meters. The reported vertical peak-to-peak error reported for the base station position from NGS OPUS was 0.039 meters, suggesting a total vertical accuracy of about 0.041 meters. Uncertainty in the vertical positions associated with the weight of the tripod settling onto the GCP tarp during data collection, and possible subsequent vertical rebound of the center of the tarp after removal is unknown.
Ground control was established using ground control points (GCPs) consisting of small square tarps with black-and-white cross patterns placed on the ground surface throughout the survey area. The GCP positions were measured using survey-grade GPS receivers operating in real-time kinematic (RTK) mode. For each GCP measurement the GPS receiver was placed on a fixed-height tripod and set to occupy each GCP for a minimum occupation time of one minute. The RTK corrections were referenced to a GPS base station occupying a previously established benchmark designated SFML, located on the Los Padres Reservoir dam approximately 1 kilometer from the survey area. In order to ensure consistency with historic surveys, the previously established position for SFML published in Smith and others, 2009 was used for the real-time surveys. After the survey, the static occupation on SFML was submitted to the National Geodetic Survey (NGS) Online Positioning User Service (OPUS).
20171101
Joshua Logan
U.S. Geological Survey, Pacific Coastal and Marine Science Center
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-460-7519
jlogan@usgs.gov
A uniform adjustment was applied to the GCPs to shift the positions from the historic reference frame published in Smith and others, 2009 to the updated reference frame observed at the SFML benchmark during the 2017 survey (derived using the National Geodetic Survey (NGS) Online Positioning User Service (OPUS)).
To ensure consistency with historic data sets, the original published position for the SFML benchmark was used for the RTK GPS base station position. Thus, the GCP positions and original SfM data products were consistent with the historic data presented in Smith and others, 2009. The SFML benchmark position published in that report is (in UTM zone 10 coordinates relative to the NAD83 reference frame):
Northing: 4027605.397
Easting: 619388.986
Ortho. Ht. [m, NAVD88]: 322.418 (GEOID03)
After the 2017-11-01 UAS survey, the 5:40 static GPS occupation on SFML was submitted to NGS OPS which derived the following current-epoch position for SFML:
Northing: 4027605.687
Easting: 619388.761
Ortho. Ht. [m, NAVD88]: 322.359 (using GEOID03 separation = -33.047 m)
Thus, the displacement between the 2009 published SFML position and the 2017-11-01 observed position is:
dN: +0.290 meters
dE: -0.225 meters
dElev.: -0.059 meters
This magnitude and direction of displacement is similar to those estimated for this location by the National Geodetic Survey Horizontal Time-Dependent Positioning (HTDP), shown below:
HTDP OUTPUT, VERSION 3.4.0
DISPLACEMENTS IN METERS RELATIVE TO NAD_83(2011/CORS96/2007)
FROM 11-05-2008 TO 11-01-2017 (month-day-year)
FROM 2008.847 TO 2017.835 (decimal years)
NAME OF SITE: SFML
LATITUDE: 36 23 10.23945 N
LONGITUDE: 121 40 7.85831 W
NORTH: 0.341 meters
EAST: -0.241 meters
UP: -0.012 meters
To produce the final data products for this data release, all data were transformed from the historic reference frame into the current-epoch reference frame consistent with the 2017-11-01 observed position for SFML. This transformation was done using a uniform horizontal and vertical adjustment applied to each data set.
For adjustment of the GCPs, the horizontal and vertical displacements were applied to the northing, easting, and elevation coordinates to shift them into the updated reference frame.
2022
Joshua Logan
U.S. Geological Survey, Pacific Coastal and Marine Science Center
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-460-7519
jlogan@usgs.gov
Point
Point
21
Universal Transverse Mercator
10
0.9996
-123.0
0.0
500000.0
0.0
coordinate pair
0.001
0.001
meters
NAD83 (National Spatial Reference System 2011) (EPSG:1116)
GRS 1980 (EPSG:7019)
6378137.0
298.257222101
North American Vertical Datum of 1988 (EPSG:5703), derived using GEOID03
0.001
meters
Explicit elevation coordinate included with horizontal coordinates
Attribute Table
Table containing attribute information associated with the dataset
Producer defined
pid
Point ID
producer defined
A unique identification code for the point.
northing_utmz10_m
Northing coordinate of data point relative to the NAD83 (National Spatial Reference System 2011) datum, projected in the Universal Transverse Mercator (UTM) Zone 10 North coordinate system, meters (EPSG:6339)
Producer defined
4026240.496
4027605.687
meters
easting_utmz10_m
Easting coordinate of data point relative to the NAD83 (National Spatial Reference System 2011) datum, projected in the Universal Transverse Mercator (UTM) Zone 10 North coordinate system, meters (EPSG:6339)
Producer defined
619388.761
619968.032
meters
orthometric_ht_navd88_m
Orthometric height of data point in meters relative to the North American Vertical Datum of 1988 (EPSG:5703), derived using the National Geodetic Survey GEOID03.
Producer defined
313.960
322.359
meters
U.S. Geological Survey - ScienceBase
mailing address
Denver Federal Center, Building 810, Mail Stop 302
Denver
CO
80225
United States
1-888-275-8747
sciencebase@usgs.gov
The GCP locations are available in a comma-delimited text format.
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.
comma-delimited text
Notepad++ v 7.8.6
The csv file contains coordinates of ground control point locations.
No compression applied
0.001
https://www.sciencebase.gov/catalog/file/get/638a95ced34ed907bf79095e?name=LosPadresReservoir_2017-11-01_GCP_positions
https://www.sciencebase.gov/catalog/item/638a95ced34ed907bf79095e
https://doi.org/10.5066/P9J9CHOH
Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to the comma-delimited text file. The second link points to a landing page with the comma-delimited text file, metadata, and a browse image. The third link points to the landing page for the entire data release, including links to pages of the various data files.
None.
The downloadable data file is available in comma-separated values (CSV) spreadsheet format. Text editing software can be used to open the file, as well as spreadsheet programs, such as Microsoft Excel.
20230111
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998