2010 Pacific Gas and Electric Diablo Canyon Power Plant (DCPP): Diablo Canyon, CA Central Coast

The Diablo Canyon Power Plant (DCPP) LiDAR and Imagery datasets are comprised of three separate LiDAR surveys: Diablo Canyon (2010), Diablo Canyon (2010), and San Simeon (2013).

The Diablo Canyon project study is located in San Luis Obispo County, California, and encompasses approximately 10,634 acres (43.03 square kilometers). Watershed Sciences, Inc. (WSI) collected Light Detection and Ranging (LiDAR) data on both the inland and intertidal land within the Diablo Canyon study area on 28 January 2010. For optimal capture of the intertidal zone, WSI acquired LiDAR data of the coastline during seasonal low tides (between 0.0 ft and peak low of around 1.5 ft) and in conjunction with a PDOP value of less than 3.0.

This LiDAR survey utilized a Leica ALS50 Phase II laser system. The sensor scan angle was +/- 13 from nadir with a pulse rate designed to yield an average native density of more than 8 pulses per square meter over terrestrial surfaces. The area of interest was surveyed with an opposing flight line side-lap of equal-to-or-more-than 50% (equal-to-or-more-than 100% overlap) to reduce laser shadowing and increase surface laser painting.

This survey was flown as part of the DCPP Long-Term Seismic Program (LTSP)

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Pacific Gas and Electric Company shall not be held liable for improper or incorrect use of these data. Data and related graphics (e.g., GIF or JPG format files) are not legal documents and are not intended to be used as such. The information contained in the data is dynamic and may change over time. The data are not better than the original sources from which they were derived. It is the responsibility of the data user to use the data appropriately and consistently within the limitations of geospatial data in general and these data in particular. The related graphics are intended to aid the data user in acquiring relevant data; it is not appropriate to use the related graphics as data. PG&E gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. It is strongly recommended that these data are directly acquired from PG&E and not indirectly through other sources which may have changed the data in some way. Although these data have been processed successfully on computer systems by Pacific Gas and Electric and its authorized representatives, no warranty expressed or implied is made regarding the utility of the data on other systems for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data.

A report for this project is available at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/3650/supplemental/ca2010_pge_dcpp_diablo_canyon_m3650_surveyreport.pdf

A footprint of this data set may be viewed in Google Earth at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/3650/supplemental/ca2010_pge_dcpp_diablo_canyon_m3650.kmz

The lidar classification are stored in LAZ format.: 1 - unclassified, 2 - ground

All deliverables meet specifications in contract. LAS Files meet ASPRS Classification Standards

Any conclusions drawn from the analysis of this information are not the responsibility of Watershed Sciences Inc, PGandE, Diablo Canyon Power Plant, OpenTopography.com, NOAA, the Office for Coastal Management or its partners.

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=3650

The data set is dynamically generated based on user-specified parameters.;

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Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations. These data depict the heights at the time of the survey and are only accurate for that time

Our LiDAR quality assurance process uses the data from the RTK ground survey conducted in the study area. In this project, a total of 129 RTK GPS measurements were collected on hard, bare earth surfaces (e.g. asphalt) distributed among multiple flight swaths. To assess absolute accuracy, we compared the location coordinates of these known RTK ground survey points to those calculated for the closest laser points.; Quantitative Value: 100 meters, Test that produced the value: Horizontal accuracy was tested by comparing the raw contours from each flightline against adjoining flightlines at specific points but was not tested against RTK.

The vertical accuracy of the LiDAR data is described as the mean and standard deviation (sigma) of divergence of LiDAR point coordinates from RTK ground survey point coordinates. To provide a sense of the model predictive power of the dataset, the root mean square error (RMSE) for vertical accuracy is also provided. These statistics assume the error distributions for x, y, and z are normally distributed, thus we also consider the skew and kurtosis of distributions when evaluating error statistics. Statements of statistical accuracy apply to fixed terrestrial surfaces only.; Quantitative Value: 0.04 meters, Test that produced the value: Tested RMSE for Z = 4.0 cm. Relative accuracies for the intertidal land within the Diablo Canyon study area: Project Average = 0.054 cm; Median Relative Accuracy = 0.044 cm; 1 sigma Relative Accuracy = 0.058 cm; 2 sigma Relative Accuracy = 0.111 cm

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