2008 Northwest Florida Water Management District (NWFWMD) LiDAR: Inland Okaloosa County

This Light Detection and Ranging (LiDAR) LAS dataset is a survey of inland Okaloosa County, Florida not

covered in the 2008 Florida Department of Emergency Management LiDAR initiative. The project area consists of

approximately 874 square miles, including a buffer of approximately 50 feet along the edges of the project. The

project design of the LiDAR data acquisition was developed to support a nominal post spacing of 4.9 feet

or 1.5 meters for un-obscured areas. Fugro EarthData, Inc. acquired 49 flight lines in three lifts on February 10, 2008.

The data was divided into 5000' by 5000' foot cells that serve as the tiling scheme. LiDAR data collection was

performed with a Cessna 310 aircraft, utilizing a Leica ALS50-II MPiA sensor, collecting multiple return x, y, and z

data as well as intensity data. LiDAR data was processed to achieve a bare ground surface. LIDAR data is remotely

sensed high-resolution elevation data collected by an airborne collection platform. Using a combination of laser

range finding, GPS positioning and inertial measurement technologies, LIDAR instruments are able to make highly

detailed Digital Elevation Models (DEMs) of the earth's terrain, man-made structures and vegetation. This data of

inland Okaloosa County, Florida, was collected at sufficient resolution to provide a nominal point spacing of

1.5m for collected points. Up to 5 returns were recorded for each pulse in addition to an intensity value.

Original contact information:

Contact Org: NOAA Office for Coastal Management

Phone: 843-740-1202

Email: coastal.info@noaa.gov

The mission of the Office for Coastal Management is to support the environmental, social, and economic well being of the

coast by linking people, information, and technology. The mission of the Northwest Florida Water Management District (NWFWMD)

is to protect and manage the water resources of northwest Florida in a sustainable manner for the continued welfare of its

residents and natural systems. These LiDAR data are intended to support the local Coastal Zone Managers in

their decision-making processes. This data will be used for flood plain mapping and other coastal management

applications.

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For more information about this data set, please refer to the survey report at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/85/supplemental

The information in this report is the result of LiDAR surveys performed on the date indicated and the general

conditions at the time of flight.

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

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

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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.

None

None

Microsoft Windows 2000 Version 5.0 (Build 2195)

Service Pack 4; ESRI ArcCatalog 9.0.0.535

The boresight of the LiDAR was processed against the ground control for this project which consisted of 20 LiDAR

ground survey points and 1 ABGPS base station at the operation airport. An additional 20 QA/QC points were

used by the mapping vendor for internal checks. The horizontal datum for the control was the North American

Datum of 1983, NSRS 2007 (NAD83 2007). The vertical datum was the North American Vertical Datum of 1988

(NAVD88). The Geoid 2003 model was used to transform the ellipsoidal heights to GPS derived orthometric

heights. Airborne GPS data was collected during the acquisition mission for each flight line. During the data

acquisition the Positional Dilution of Precision (PDOP) for the airborne GPS (ABGPS) was monitored and held at or

below 3.5 when possible. The control points were measured by technicians using Terrascan and proprietary

software and applied to the boresight solution for the project lines. An independent check of the accuracy of

the bare earth LiDAR product was conducted using land cover quality control points.

The minimum expected horizontal accuracy was tested to meet or exceed the National Standard for Spatial Data

Accuracy (NSSDA). Horizontal accuracy is 1 meter RMSE or better at the 95% confidence level.

Tested 6.1 cm RMSE for unobstructed terrain.

Cloud Cover: 0

The following methods are used to assure LiDAR:

1. Use of IMU and ground control network utilizing GPS techniques.

2. Use of airborne GPS in conjunction with the acquisition of LiDAR.

3. Measurement of quality control ground survey points within the finished product.

The following software is used for the validation:

1. Terrascan

2. EarthData Proprietary Software

Compliance with the accuracy standard was ensured by the collection of GPS ground control after the acquisition

of aerial LiDAR and the establishment of a GPS base station at the Destin-Fort Walton Beach Airport. The

following checks were performed.

1. The ground control and airborne GPS data stream were validated through a fully analytical boresight adjustment.

2. The DTM (Digital Terrain Model) data were checked against the project control.

3. LiDAR elevation data was validated through an inspection of edge matching and visual inspection for quality

(artifact removal).