2007 California Department of Water Resources Topographic LiDAR: San Joaquin Delta

These data are from LIDAR flights of the Sacramento-San Joaquin Delta conducted during late January and February of 2007. The work was conducted under contract issued by

California Department of Water Resources to URS Corporation. The prime LIDAR creation subcontractor was EarthData International, (later Fugro EarthData), also known as EDI.

The principal aerial survey firm under subcontract to EDI was Airborne 1 Corporation. In effect, Airborne 1 performed the aerial survey, and EDI did the processing and deliverables

preparation. Also involved in the contract to URS was an independent QA/QC firm, Spectrum Mapping LLC.

The data was delivered to OCM as unclassified, multiple return elevation measurements and intensity in LAS V1.0 format. The NOAA OCM used an unsupervised classification algorithm to

classify the data into the following ASPRS classifications: Class 1 (Unclassified), Class 2 (Ground), and Class 7 (Noise) . Class 2 includes bare earth points and water points.

High-resolution digital elevation maps generated by airborne and stationary LiDAR have led to significant advances in geomorphology, the branch of

geoscience concerned with the origin and evolution of Earth's surface topography. LiDAR provides unique characteristics relative to other remotely sensed data sources

by providing three-dimensional feature information that cannot be derived from traditional imaging sensors.

10282

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2523/supplemental/ca2007_cwdr_sanjoaquindelta_footprint.KMZ

LiDAR points in LAS 1.0 format

none

Any conclusions drawn from the analysis of this information are not the responsibility

of the California Department of Water Resources, USGS, Fugro EarthData Inc, Airborne 1, Spectrum Mapping Inc, 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=2523

;

None

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and some parts of this data may no longer represent actual surface conditions.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.

The identification of features is provided by the distinct electromagnetic energy it emits,reflects, or otherwise transmits. This is called the spectral signature.

Other signatures such as tone (lightness or darkness), texture (surface roughness or smoothness), pattern,shadow, shape, and size are as important. Thus, through the

use of the thematic mapper sensor, such elements as water features, soils, and vegetation can be identified and distinguished from each other.

1.0m (3.28ft) @ 1 sigma; Quantitative Value: 1.0 meters, Test that produced the value: Horizontal accuracy @ 1 sigma

Data set tested to meet FVA of 9.4 cm RMSEz. (18.5cm (0.6ft) @ 95% confidence level, 15cm (0.5ft) @ 90% confidence level.; Quantitative Value: .094 meters, Test that produced the value: Tested to meet RMSEz of 9.4 cm Accuracyz = RMSEz X 1.9600 at the 95% confidence level.

The lidar collection has been acquired by the CWDR and is only distributed by the NOAA Office for Coastal Management. While the OCM tries to ensure data quality, there is no warranty as to the accuracy,

reliability or completeness of the lidar data.

All data formatted by OCM validated using commercial GIS software to ensure proper formatting and loading.