2007 Lake County Board of County Commissioners Topographic LiDAR: Lake County, Florida

This metadata document describes the LiDAR point data in LAS format produced by Kucera covering the project area of Lake County, FL. The data produced is satisfactory for the generation of both 1' and 2' contours. The average point

spacing for all tiles is estimated to be 1 meter.

Original contact information:

Contact Name: Kevin Willis

Contact Org: Lake County Board of County Commissioners, Department of Information Technology, GIS Division

Title: Interim GIS Director

Phone: 352-343-9791

Email: kwillis@lakecountyfl.gov

LiDAR points depict the 'bald earth' within the project area. All points not specifically derived from the terrain are removed (tree canopy, buildings, etc.). As such, the file is useful for a variety of applications,

such as aiding in contour generation and the production of orthophotos.

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1431/supplemental/2007_LakeCounty_Florida.kmz

LiDAR points in LAS 1.2 format

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

of Woolpert, USGS, 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=1431

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and some parts of this data may no longer represent actual surface conditions.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

The attribute accuracy is tested in the LiDAR processing stage. After classification of the LiDAR data, the 'bald earth' point class is compared to ground control collected within the project area.

Horizontal positional accuracy for LiDAR is dependent upon the quality of the GPS/INS solution, sensor calibration and ground conditions at the time of data capture. Standard horizontal accuracy for LiDAR at

this mapping scale is 1 meter (3.28').

; Quantitative Value: 1.0 meters, Test that produced the value: This value (in meters) is computed by comparing controls to an intensity based image derived from the classified LiDAR data and represents the RMSE of residuals on controls within the project area.

Horizontal positional accuracy for LiDAR is dependent upon the quality of the GPS/INS solution, sensor calibration and ground conditions at the time of data capture.

The vertical accuracy was tested with a result of a RMSE 0.062m (0.205').

; Quantitative Value: 0.062 meters, Test that produced the value: This value (in meters) is computed by comparing controls to the classified LiDAR ground surface and represents the RMSE of residuals on controls within the project area.

LiDAR data is collected within the project area, processed and verified against control. The bare earth surface will contain voids where insufficient energy was reflected from the surface to generate a valid return from the terrain.

Data was filtered using automated procedures followed by a manual review of the completed data set.