2010 ARRA Lidar: California Coastal Project (Zone 4)

The primary purpose of this project was to develop a consistent and accurate surface elevation dataset derived from high-accuracy Light Detection and Ranging (LiDAR) technology for the USGS California Coastal LiDAR project area.

The LiDAR data were processed to a bare-earth digital terrain model (DTM). Detailed breaklines and bare-earth DEMs were produced for the project area. Data was formatted according to tiles with each tile covering an area of 1500 m by 1500 m. A total of 712 tiles were produced for the project encompassing an area of approximately 610 sq. miles.

NOAA's Office for Coastal Management formed two projects from the data delivery based on original data projections.

The purpose of this LiDAR data was to produce high accuracy 3D elevation products, including tiled LiDAR in LAS 1.2 format, 3D breaklines and 2 m cell size hydro flattened Digital Elevation Models (DEMs).

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A report for this project is available at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/4843/supplemental/ca2010_ARRA_centralcoast_z4_m4843_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/geoid18/4843/supplemental/ca2010_ARRA_centralcoast_z4_m4843.kmz

LAS 1.2 format (classes 1,2,7,9,10)

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Any conclusions drawn from the analysis of this information are not the responsibility of Dewberry, USGS, 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=4843

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

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This data was produced for the USGS according to specific project requirements. This information is provided "as is". Further documentation of this data can be obtained by contacting: USGS/NGTOC, 1400 Independence Road, Rolla, MO 65401. Telephone (573) 308-3612.

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be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions.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.

Dewberry does not perform horizontal accuracy on the LiDAR. Compiled to meet 2.0 meter horizontal accuracy at the 95 percent confidence level by Terrapoint.; Quantitative Value: 2.0 meters, Test that produced the value: Dewberry does not perform horizontal accuracy on the LiDAR. Compiled to meet 2.0 meter horizontal accuracy at the 95 percent confidence level by Terrapoint. Please see the final project report delivered to the USGS for more details.

Vertical Lidar data accuracy was tested against 21 independently surveyed check points. The result of the test is an RMSEz = 0.06 meters (0.12 meters at 95 percent confidence level). satisfies the vertical accuracy NSSDA RMSEz of 0.09 meters.; Quantitative Value: 0.06 meters, Test that produced the value: Based on the vertical accuracy testing conducted by Dewberry, using NSSDA and FEMA methodology, vertical accuracy at the 95% confidence level (called Accuracyz) is computed by the formula RMSEz x 1.9600. The dataset for the USGS San Francisco Coastal LiDAR project satisfies the criteria:

Lidar dataset tested 0.12 meters vertical accuracy at 95% confidence level for all land cover types, based on consolidated RMSEz (0.06 m) x 1.9600.

A visual qualitative assessment was performed to ensure data completeness and full tiles. No void or missing data exists.

Data covers the tile scheme provided for the project area.