gov.noaa.csc.maps:fl2004_stjohns St. Johns County, Florida Public Works Department 2004 First Charleston, SC NOAA's Ocean Service, Coastal Services Center (CSC) http://www.csc.noaa.gov/lidar This dataset is the bare earth lidar data for St. Johns County, Florida, acquired in early January and February of 2004. This data was collected to develop comprehensive countywide base mapping and perform other GIS enhancements to support master drainage planning, transportation planning, preliminary engineering and wetland preservation studies. The surveyed area included all of St. Johns County, approximately 610 square miles. Eighty-seven (87) flight lines of high density lidar data (average GSD is 3.3 feet) were obtained at an altitude of 3000 feet AGL. This data set contains only model keypoints (points that are a thinned data set that is intended to remove extraneous data such as trees and points that are deemed redundant to the final bare earth product) that are classified as ground points. As a result, there are a lower number of points than in a full mass point lidar data set; and it is recommended that the data be downloaded as points and used with a TIN (Triangulated Irregular Network) or similar algorithm to produce a bare earth surface. The purpose of this topographic lidar survey was to produce a digital terrain model (DTM) of sufficient density and accuracy to generate 1-foot contours, compile limited planimetric features and generate panchromatic (black and white) digital orthophoto imagery (DOI). The Minimum Technical Standard Report for St. Johns County, FL may be viewed at: ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/fl/st_johns/2004_MTS_Final_Report_stjohns.pdf 20040117 20040207 Publication date Complete As needed -81.669173 -81.212673 30.259696 29.621896 ISO 19115 Topic Category Elevation None Bathymetry/Topography LiDAR Terrain Model Elevation Surface Laser None US Florida St. Johns County 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be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions.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. Mike Campbell St. Johns County Florida GIS St. Johns County GIS Manager Physical address

4020 Lewis Speedway

St. Augustine Florida 32084 USA 904-209-0778 gis@sjcfl.us Acknowledgement of the St. Johns County Public Works Department would be appreciated in products derived from these data. Not provided Not provided Compiled to 1" to 100' scale Based on the DTM Accuracy Analysis, the vertical accuracy of the DTM/TIN is 9.75 cm (0.32 feet) RMSE at the 1 sigma level (+/- 19.2 cm (0.63 feet) at the 95% confidence level) for unobscured points. St. Johns County, Florida Public Works Department 2004 First Model St. Augustine, Florida St. Johns County Public Works Department External hard drive 20040117 20040207 Publication Date Ground Condition Unknown The LiDAR data was acquired in 93 flight lines acquired in 6 sessions between January 17 and February 7, 2004 from an altitude of 3,000 feet above ground level (AGL) to provide an average ground sample distance (GSD) of 3.3 feet. Three concurrent airborne GPS base stations were used for each acquisition session. The ABGPS data were reduced using the GrafNav software package by Waypoint Consulting, Inc. The IMU data was reduced using the PosProc software package by Applanix Corporation. The initial lidar "point cloud" was derived through the ALS Post Processor software package by Leica Geosystems. The aircraft, lidar system and associated computer hardware and software are owned and operated by Woolpert LLP. Once the initial lidar "point cloud" was derived, Woolpert performed QC to look for any systematic error within the lidar flights using proprietary software. After systematic error was identified and removed, the individual lidar flights were clipped to remove overlap between adjacent flight lines and provide a homogeneous coverage over the project extents. Using the homogeneous coverage, above ground features were classified and removed using proprietary software to produce the bare-earth coverage. 2004 Savo Slijepcevic Woolpert, Inc. Project Director Physical address

3504 Lake Lynda Dr., Suite 400

Orlando Florida 32817 USA 407-381-2192 407-384-1185 savo.slijepcevic@woolpert.com The NOAA Coastal Services Center (CSC) received the files in ASCII format. The data was in Florida State Plane Projection, NAVD88 vertical datum and the vertical units of measure were feet. CSC performed the following processing to the data to make it available within Digital Coast: 1. The data were converted from Florida State Plane East, Zone 0901 coordinates to geographic coordinates. 2. The data were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoid) heights using Geoid 03. 3. The vertical unit of measure for the data was converted from feet to meters. 4. The LAS data were sorted by latitude and the headers were updated. 20081103 Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC) Coastal Elevation Mapping (CEM) Project Scientist Mailing and physical address

2234 South Hobson Ave.

Charleston SC 29405-2413 843-740-1200 tcm@csc.noaa.gov Point Point 0.000000001 0.000000001 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 Ellipsoid 0.001 Meters Explicit elevation coordinate included with horizontal coordinates Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC) CEM Project Scientist Mailing and physical address

2234 South Hobson Ave.

Charleston SC 29405-2413 843-740-1200 tcm@csc.noaa.gov Downloadable Data Any conclusions drawn for the analysis of this information are not the responsibility of the St. Johns County Public Works Department, the Coastal Services Center, or its partners. This data can be obtained on-line at the following URL: http://www.csc.noaa.gov/lidar DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Kelly Stroker Mailing and Physical Address

NOAA/NESDIS/NGDC E/GC1 325 Broadway

Boulder CO 80305-3328 USA (303) 497-4603 (303) 497-6958 (303) 497-6513 kelly.stroker@noaa.gov 7:30-5:00 Mountain Contact Data Center Disclaimer While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. The National Geophysical Data Center serves as the archive for this LIDAR data. NGDC should only be contacted for this data if it cannot be obtained from NOAA Coastal Services Center. 20090408 Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC) CEM Project Scientist Mailing and physical address

2234 South Hobson Ave.

Charleston SC 29405-2413 843-740-1200 tcm@csc.noaa.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998