2010 Northwest Florida Water Management District (NWFWMD) Lidar: Mission 2010 (Portions of Liberty and Calhoun Counties)

LIDAR-derived binary (.las) files containing points classified as: Unclassified (1), Ground (2) and Water (9) were produced for the

2010 Northwest Florida Water Management District - 2 Counties (Calhoun and Liberty), Florida LIDAR mapping project. The data were

collected March 30 - April 1, 2010 and the total mapping area covers approximately 585 square miles in Liberty County and 2.65 square

miles in Calhoun County.

Original contact information:

Contact Name: Mr. John Crowe

Contact Org: Northwest Florida Water Management District (NWFWMD)

Title: Associate Hydrologist, Division of Resource Management

Phone: 850-539-5999

Email: John.Crowe@nwfwmd.state.fl.us

To produce accurate, high-resolution data for planning, analysis, and for use with other data sets.

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The Northwest Florida Water Management District (NWFWMD) Portions of Liberty and Calhoun Counties, Florida LiDAR Mapping Report

may be viewed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/581/supplemental/NWFWMD_Liberty_County_LiDAR_Mapping_Report.pdf

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/581/supplemental/2010_NWFWMD_2010_Mission_Lidar.kmz

Use ASPRS LAS 1.2 specifications / classification designations for filtering:

Class 1 = Unclassified (i.e., vegetation, buildings, cars, structures, and other miscellaneous features)

Class 2 = Ground (i.e., bare-earth)

Class 9 = Water

LIDAR intensity values range from 0-255.

LIDAR return values range from 1-3.

Flight line numbers range from 1-19.

Use ASPRS LAS 1.2 specifications / classification designations for filtering:

Class 1 = Unclassified (i.e., vegetation, buildings, cars, structures, and other miscellaneous features)

Class 2 = Ground (i.e., bare-earth)

Class 9 = Water

Any conclusions drawn from analysis of this information are not the responsibility of the Northwest Florida Water Management District (NWFWMD),

the NOAA Office for Coastal Management or its partners.

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This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer

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.

Microsoft Windows XP version 5.1 (Build 2600, Service Pack 2); ArcGIS Desktop 9.1; ArcGIS Workstation 9.1; MARS 4.0

Verification of attribute accuracy of LIDAR data involves the use of filtering techniques. Auto-filtering uses algorithms to reclassify

data in the point cloud. Hand-filtering involves the use of a technician working in a graphic environment to reclassify the erroneous

points that may remain in the LIDAR point cloud after auto filter.

Horizontal accuracy is verified in three tests. During boresighting, adjoining flightlines are view in profile and hard edged features

are observed and if necessary the flightlines are adjusted for good relative horizontal and vertical fit. The second test for horizontal

accuracy is by comparing raw contours from each flightline against adjoining flightlines at specific points. The final test is the

vertical LIDAR control report.

Survey control points were used to validate the accuracy of the LIDAR surface model after automatic and hand filtering. This surface

exceeds the NDEP vertical accuracy specifications of 18.5cm RMSEz. The vertical accuracy for this data set is 0.60 ft (0.18 m) RMSEz.

Cloud Cover: 0

This dataset contains classified returns of the LIDAR sensor. The sensor data was verified in MARS software to ensure complete coverage.

Calibrations of the LIDAR flightline data are performed; this process is known as boresighting. The flightlines are compared to evaluate

both their relative and absolute accuracies.