2009 St. Johns River Water Management District (SJRWMD) Lidar: Portions of Orange and Seminole Counties, Florida

The project area covers 318 square miles in the eastern half of Seminole County plus portions of north central and northeast Orange County

in the state of Florida. The LiDAR data was collected 8 - 11 February 2009. The data are classified: 1 = Unclassified, 2 = Ground,

7 = Noise, 9 = Water and 12 = Overlap.

Original contact information:

Contact Org: St. Johns River Water Management District

Title: GIS Data Manager, Information Resources Department

Phone: (386) 329-4500

Email: gis_support@sjrwmd.com

To develop a consistent and accurate surface elevation dataset for a portion of the Central Florida Coordination Area (CFCA) in

accordance with the Florida Department of Emergency Management (FDEM) Baseline Specifications. The CFCA defines an area that faces

particularly difficult water supply issues. Three of Florida's Water Management Districts have jurisdiction in the CFCA: the South

Florida Water Management District (SFWMD), the St. Johns River Water Management District (SJRWMD), and the Southwest Florida Water

Management District (SWFWMD). These three water management districts are cooperating to develop and implement mutually acceptable

strategies to provide adequate supplies of water to support projected growth without unacceptable impacts.

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The Specific Purpose Lidar Survey Report may be viewed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/535/supplemental/Survey_Report_for_SJRWMD_Elevation_Dataset_FINAL.pdf

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/535/supplemental/SJRWMD_Lidar.kmz

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;

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.

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850

Lidar source compiled to meet 1 m horizontal accuracy.; Quantitative Value: 1 meters, Test that produced the value:

Dewberry does not perform independent horizontal accuracy testing on the LiDAR. LiDAR vendors perform calibrations on the LiDAR

sensor and compare data to adjoining flight lines to ensure LiDAR meets the 1 meter horizontal accuracy standard at the 95% confidence level.

Please refer to Appendix D: LiDAR Processing Report, of the Lidar report referenced above in the Supplemental_Information field for more

details.

The FDEM Baseline Specifications were used for the vertical accuracy assessment for this project.; Quantitative Value: 0.155 meters, Test that produced the value:

Based on the vertical accuracy testing conducted by Dewberry, using NSSDA and FEMA methodology, vertical accuracy at the 95% confidence

level (called Accuracyz) is computed by the formula RMSEz x 1.9600. The dataset for St. Johns River Water Management District satisfies

the criteria:

Lidar dataset tested 0.155 m (0.51 ft) fundamental vertical accuracy (FVA) at 95% confidence level in open terrain, based on open terrain

RMSEz 0.079 m (0.26 ft) x 1.9600.

Lidar dataset tested 0.31 m (1.004 ft) consolidated vertical accuracy (CVA) at 95% confidence level in all land cover categories combined,

based on consolidated RMSEz 0.137 m (0.45 ft) x 1.9600.

Based on the vertical accuracy testing conducted by Dewberry, using NDEP and ASPRS methodology, consolidated vertical accuracy at

the 95% confidence level is computed using the 95th percentile method. The dataset for St. Johns River Water Management District

satisfies the criteria:

Lidar dataset tested 0.305 m (1.00 ft) consolidated vertical accuracy at 95% confidence level in all land cover categories combined.

Please refer to Appendix A: LiDAR Vertical Accuracy Report, of the Lidar report referenced above in the Supplemental_Information field

for more details.

A visual qualitative assessment was performed in the source Lidar dataset.

Data covers the tile scheme provided for the county.