2006 Florida LiDAR: Escambia, Santa Rosa, and Walton Counties

ESCAMBIA: The Light Detection and Ranging (LiDAR) LAS dataset is a survey of select areas within Escambia County, Florida.

These data were produced for Dewberry and Davis LLC. The Escambia County LiDAR Survey project area consists of approximately 803

square miles. The LiDAR point cloud was flown at a density sufficient to support a maximum final post spacing of 6 feet for

unobscured areas. Land Air mapping acquired 110 flightlines between June 21, 2006 and July 18, 2006. The data was divided into

5000' by 5000' foot cells that serve as the tiling scheme. The Escambia County LiDAR Survey was collected under the guidance of a

Professional Mapper/Surveyor.

Dates of Collection: 20060621-20060718 Contractor: Dewberry and Davis, LLC

SANTA ROSA: LiDAR data collection was performed utilizing a Leica ALS-50 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 was delivered in LAS format.

Dates of Collection: 20060112-20060228 Contractor: Photo Science, Inc.

WALTON: 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 Walton

County, Florida, was collected at sub-meter resolution to provide average point spacing of 0.7m for collected points. Up to 5

returns were recorded for each pulse in addition to an intensity value. No data for Eglin AFB, permission to fly over was ever

granted.

Dates of Collection: 20060710-11, 19-20, 22-23, 26-29, 20060801, 03, 06-07, 13, 15, 17 Contractor: Sanborn

Original contact information:

Contact Org: NOAA Office for Coastal Management

Phone: 843-740-1202

Email: coastal.info@noaa.gov

ESCAMBIA: The Escambia County, Florida Water Management District uses topographic information to support regulatory, land

management and acquisition, planning, engineering, and habitat restoration projects. The Escambia County LiDAR Survey data

will support the creation of Federal Emergency Management Agency Flood Insurance Rate Maps (FEMA FIRM) and an integrated ground

and surface water model for the Escambia County. All data will be public record as defined by applicable Florida statues. The

Escambia LiDAR Survey was collected under the guidance of a Licensed and professional Surveyor and Mapper.

SANTA ROSA: Final product delivery of bare ground surface was intended to suit the needs of NOAA for elevation-related tasks.

WALTON: This data was collected to support the creation of the Federal Emergency Management Agency Flood Insurance Rate Maps

(FEMA FIRM) and an integrated ground and surface water model for Walton County.

10232

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

conditions at the time.

The Final Report of the QA/QC Assessment of Escambia County, Florida may be viewed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/57/supplemental

SANTA ROSA: The Final Report of the QA/QC Assessment of Santa Rosa County, Florida may be viewed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/57/supplemental

WALTON: Reflective surface data represents the DEM created by laser energy reflected from the first surface

encountered by the laser pulse. Some energy may continue beyond this initial surface to be reflected by a subsequent surface

as represented by the Last Return data. Intensity information is captured from the Reflective Surface pulse and indicates

the relative energy returned to the sensor as compared to the energy transmitted. The Intensity image is not calibrated or

normalized but indicates differences in energy absorption due to the interaction of the surface materials with laser energy

at the wavelength transmitted by the sensor. Points are classified as on ground surface or not on ground surface to support

creation of a bare earth model from the data. Points in the filtered ground class determined to be in open waterways or water

bodies were reclassified as Water.

The Final Report of the QA/QC Assessment of Walton County, Florida may be viewed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/57/supplemental/index.html

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.

;

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 the actual surface conditions. Users should not use this data for critical applications without

a full awareness of its limitations.

ESCAMBIA: Stream shore lines and 2-D coordinate line strings were collected as breaklines using LiDAR

that was acquired and processed to FEMA specifications. These breaklines were created from on-screen digitizing using a

combination of the LiDAR points and the orthophotography. Attributes were verified using routines that verify the vertical and

horizontal positions of the breaklines.

SANTA ROSA:

1. LiDAR data was collected and processed in accordance with FEMA guidance as published in Appendix A, February, 2002.

2. LiDAR data at the interface between the land and ocean was collected (when possible) during periods when tides were predicted to

be below mean lower low water. 3. LiDAR data accuracy is in accordance with the National Standard for Spatial Data Accuracy (NSSDA).

When compared to GPS survey grade points in generally flat non-vegetated areas, at least 95% of the positions have an error less

than or equal to 36.3 cm (equivalent to root mean square error of 18.5 cm if errors were normally distributed).

WALTON: No attributes were tested

ESCAMBIA: Countywide LiDAR dataset compiled to meet 1 meter horizontal accuracy at 95% confidence level.

SANTA ROSA: None

WALTON: Compiled to meet 1 meter horizontal accuracy at 95% confidence level.

ESCAMBIA: Countywide LiDAR dataset tested 13.7 cm vertical accuracy at 95% confidence level in open terrain, based on open

terrain RMSEz (7 cm) x 1.9600; tested 33.3 cm vertical accuracy at 95% confidence level in all land cover categories combined,

based on consolidated RMSEz (17 cm) x 1.9600. Independent accuracy testing was performed by Dewberry & Davis using 101 high

accuracy quality control checkpoints distributed throughout the county in five major land cover categories identified by the

North West Florida Water Management District. Dewberry used testing procedures consistent with those specified in the National

Standard for Spatial Data Accuracy (NSSDA) as well as LiDAR accuracy testing guidelines and specifications published by the

Federal Emergency Management Agency (FEMA), National Digital Elevation Program (NDEP), and American Society for Photogrammetry

and Remote Sensing (ASPRS).

SANTA ROSA: LiDAR data accuracy is in accordance with the National Standard for Spatial Data

Accuracy (NSSDA). When compared to GPS survey grade points in generally flat non-vegetated areas, at least 95% of the positions

have an error less than or equal to 36.3 cm (equivalent to root mean square error of 18.5 cm if errors were normally distributed).

WALTON: 13 cm root mean square error (RMSE)

Cloud Cover: Unknown

ESCAMBIA: The LAS files were flown at a density sufficient to support 2-foot topographic products for unobscured areas. The

bare-earth surface will contain voids in areas that were densely vegetated, covered by bridges, buildings, water, fresh asphalt,

sand etc.

SANTA ROSA: Complete

WALTON: LIDAR raster data is visually inspected for completeness to ensure that any gaps between flight lines or loss of signal

represents less than 5% of required collection area. LIDAR is self-illuminating and has minimal cloud penetration capability.

Water vapor in steam plumes or particulates in smoke may cause reflection of LIDAR signals and loss of elevation information beneath

these plumes. Glass structures and roofs may appear transparent to the LIDAR signal and therefore may not register on the reflective

surface. Some asphalt formulations have been shown to absorb topographic LIDAR wavelength energy resulting in "pitting" of roof

surfaces using this material. No data for Eglin AFB, permission to fly over was ever granted.

ESCAMBIA: The LAS files were flown at a density sufficient to support a maximum final post spacing of 6 feet for unobscured areas.

3001 inc. acquired 110 flightlines between June 21, 2006 and July 18, 2006. The data was divided into 5000' by 5000' foot cells

that serve as the tiling scheme. The Escambia County LiDAR Survey was collected under the guidance of a Professional Mapper/Surveyor.

SANTA ROSA: LiDAR data was delivered covering the full extent of Santa Rosa County, Florida, with coverage extending 1000m beyond

the county boundary.

WALTON: All LAS formatted LIDAR data are validated using commercial GIS software to ensure proper formatting and loading before

delivery. This validation procedure ensures that data on delivery media is in correct physical format and is readable.