gov.noaa.csc.maps:fl2008_stjohns_m1119 Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC) St. Johns County, FL GIS Division 20090106 LAS http://www.csc.noaa.gov/dataviewer/index.html?action=advsearch&qType=in&qFld=ID&qVal=1119 http://www.csc.noaa.gov/lidar http://www.csc.noaa.gov Airborne terrestrial LiDAR was collected for St. Johns County, FL. System Parameters/Flight Plan. The LiDAR system acquisition parameters were developed based on a maximum average ground sample distance of 2.1 feet. A Leica ALS50 LiDAR sensor was used for acquisition. Acquisition specifications for the sensor follows: Field of View (full angle) - 24 degrees, Nominal flight altitude (AGL) - 3000 feet, Airspeed - 130 mph (113 knots), Laser pulse rate - 100,000 Hz, Nominal swath width (on ground) - 1275 feet, Maximum cross track point spacing - 2.07 feet, Maximum along track point spacing - 4.30 feet, Average point spacing - 1.67 feet, Flight line spacing - 970.47 feet, Side overlap - 23.91 percent. LiDAR System Calibration. Prior to the LiDAR acquisition, the system underwent a calibration to verify the operational accuracy and misalignment angles. Boresight calibrations were performed for the LiDAR system at the beginning and end of each flight mission. LiDAR Data Acquisition. LiDAR data acquisition only occurred when the sky was sufficiently clear of clouds, smoke, and atmospheric haze. The LiDAR data was processed immediately after the acquisition to verify the coverage had no voids. GPS/Inertial Measurement Unit (IMU) Post Processing. The GPS and IMU data was post processed using differential and kalman filter algorithms to derive a best estimate of trajectory. The quality of the solution was verified to be consistent with the accuracy requirements of the project. LiDAR Processing and Classification. The LiDAR data was post processed and verified to be consistent with the project requirements in terms of post spacing and absence of artifacts. The point cloud underwent classification to determine bare-earth points (class 2), noise points (class 7), water returns (class 9), and unclassified data (class 1). Class 12 contains LiDAR points removed from the overlap region between adjacent flight lines. The DTM was developed to support the development and maintenance of the St. Johns County Countywide Digital Contour Mapping Project. Project Title- Countywide Digital Contour Mapping; Vendor Name- Woolpert, Inc. The Final QA/QC Quantitative Assessment Report for this data set may be viewed at: ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/fl/st_johns/2008_StJohns_MTS_Final_Report_Lidar_Ortho.pdf The Final Ground Control Survey Report (more detail given to field activities, process, etc.) may be viewed at: ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/fl/st_johns/2008_StJohns_MTS_Final_Report_Ground_Control.pdf An additional Aerial Triangulation Report may be accessed at: ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/fl/st_johns/2008_StJohns_MTS_Final_Report_AerialTriangulation.pdf A footprint of this data set may be viewed in Google Earth at: ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/fl/st_johns/2008_St_Johns_County_FL_Countywide_Lidar.kmz 20080214 20080215 20080216 20080217 20080219 20080220 20080221 20080225 ground condition Complete As needed -81.669741 -81.212177 30.253509 29.621834 ISO 19115 Topic Category elevation None Bathymetry/Topography lidar Digital Elevation Model DEM remote sensing topography 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. Information from the St. Johns County Geographic Information System is provided for general reference purposes only and is not to be construed as a survey or legal document. Errors from non-coincidence of features from different sources may be present. The St. Johns County Geographic Information System makes every reasonable effort to ensure that the information provided herein is current and accurate. However, St. Johns County provides no warranties, expressed or implied, concerning the accuracy, completeness, reliability, or suitability of this data for any particular use or purpose. St. Johns County assumes no liability whatsoever associated with the use or misuse of such data. St. Johns County GIS Division mailing and physical address

500 San Sebastian View

Saint Augustine Florida 32084 USA 904-209-0778 904-209-0779 gis@sjcfl.us 7:30 am To 4:30 pm M-F Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.2.0.1324 The LiDAR DTM was developed in accordance with St. Johns specifications. This feature class represents the complete set of data for 797 5,000' x 5,000' tiles within St. Johns County. Horizontal accuracy is +/- 3.8-foot at the 95% confidence level using RMSE(r) x 1.7308 as defined by the FGDC Geospatial Positional Accuracy Standards, Part 3: NSSDA. 3.8 LiDAR system calibration is available in the MTS Report of Specific Purpose Survey. Vertical accuracy is +/- 0.4-foot RMSE for unobscured ground points. The accuracy assessment was performed using a standard method to compute the root mean square error (RMSE) based on a comparison of ground control points and filtered LiDAR data points. Filtered LiDAR data has had vegetation and cultural features removed and by analysis represents bare earth elevations. The RMSE figure was used to compute the vertical National Standard for Spatial Data Accuracy (NSSDA). The vertical accuracy of the 2-foot contours, with supplemental 1-foot contours, is +/- 0.75 foot RMSE in unobscured areas. 0.4 The accuracy assessment was performed using a standard method to compute the root mean square error (RMSE) based on a comparison of ground control points and filtered LiDAR data points. Results for this project are available in the MTS Report of Specific Purpose Survey. St. Johns County, Woolpert, Inc. Woolpert, Inc. 20080630 Unknown model 1200 disc 20080214 20080225 date of collection LiDAR Onboard Laser Ground (class 2) LAS points were extracted in ArcMap, using a Woolpert Team-developed VB Script, and loaded into the MASSPOINTS feature class for each area's Geodatabase as multipoint geometry. 20080106 Woolpert, Inc. mailing and physical address

3504 Lake Lynda Drive, Suite 400

Orlando Florida 32817 USA 407-381-2192 407-384-1185 www.woolpert.com 8:00-5:00 Monday-Friday The NOAA Coastal Services Center received the data in LAS format. The files contained Lidar elevation and intensity measurements. The data were projected in State Plane coordinates (NAD83; Florida East) and referenced to the North American Vertical Datum of 1988 (NAVD88) using the Geoid03 model. The following processes were performed to make the data available within the Digital Coast: 1. The data were converted from state plane (NAD83; Florida East) to geographic coordinates (NAD83). 2. The data were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoidal) heights using the Geoid03 model. 3. The LAS data were sorted by latitude and the headers were updated. 20111115 NOAA Coastal Services Center Clearinghouse Manager mailing and physical

2234 South Hobson Ave.

Charleston SC 29405-2413 843-740-1210 csc.info@noaa.gov For questions please use the form at http://www.csc.noaa.gov/contact/contactForm.htm The NOAA National Geophysical Data Center (NGDC) received Lidar data files by ftp. The data received compressed containing LiDAR data from the NOAA Coastal Services Center. The data are currently being served via Digital Coastl at http://www.csc.noaa.gov/digitalcoast/. The data can be used to re-populate the system. The data are provided in LAS format. LAS format is an industry standard for serving LiDAR data. The data are exclusively in geographic coordinates, however, the datums used vary. Most are NAD 83, however some are in ITRF. Vertical systems include both ellipsoid (ITRF and NAD 83) and NAVD 88. For NAVD 88 values, Geiod 03 is primarily used; however, data received in NAVD 88 prior to 2003 was processed using Geoid 99. 20120213 DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Pamela Grothe Mailing and Physical Address

NOAA/NESDIS/NGDC E/GC1 325 Broadway

Boulder CO 80305-3328 USA (303) 497-6120 (303) 497-6958 (303) 497-6513 pamela.grothe@noaa.gov 7:30-5:00 Mountain Contact Data Center Point 0.0000001 0.0000001 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222101 Ellipsoid 0.001 meters Explicit elevation coordinate included with horizontal coordinates NOAA Coastal Services Center mailing and physical

2234 South Hobson Ave.

Charleston SC 29405-2413 843-740-1200 csc.info@noaa.gov For questions please use the form at http://www.csc.noaa.gov/contact/contactForm.htm Downloadable Data Any conclusions drawn from the analysis of this information are not the responsibility of 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 Pamela Grothe Mailing and Physical Address

NOAA/NESDIS/NGDC E/GC1 325 Broadway

Boulder CO 80305-3328 USA (303) 497-6120 (303) 497-6958 (303) 497-6513 pamela.grothe@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. 20120213 20120213 20130213 NOAA Coastal Services Center mailing and physical

2234 South Hobson Avenue

Charleston SC 29405-2413 843-740-1200 csc.info@noaa.gov For questions please use the form at http://www.csc.noaa.gov/contact/contactForm.htm FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998