gov.noaa.csc.maps:swfwmd2007_hernando Southwest Florida Water Management District (SWFWMD) 20080218 First Charleston, SC NOAA's Ocean Service, Coastal Services Center (CSC) http://www.csc.noaa.gov/ldart This dataset is one component of a digital terrain model (DTM) for the Southwest Florida Water Management Districts FY2006 Digital Orthophoto (B089) and LiDAR Project (L776) encompassing approximately 462 square miles in Hernando County, Florida. This dataset is comprised of 530 LiDAR files, based on the DISTRICT 5,000' by 5,000' sheet index system in the LAS version 1.1 file format. LiDAR acquisition dates were January 11 through January 16, 2007. The raw data was collected at an average ground sample distance of 2.1 feet. Other components of the DTM include a personal geodatabase in accordance with the SWFWMD 2006 Topographic Database Design containing: obscured vegetation polygons; road overpass polygons; road breaklines; soft feature breaklines; water body polygons; coastal shorelines; hydrographic features breaklines; island polygons; and 1-foot contours. Final products include FEMA-compliant LIDAR-derived DTM data and 1-foot contours (for cartographic visualization purposes only) meeting or exceeding National Map Accuracy Standards for 2-foot contours. The DTM was developed to support the District's regulatory, land management and acquisition, planning, engineering, and habitat restoration projects. Project Title: FY2007 Digital Orthophoto (B089) and LiDAR Project (L776) Purchase Order: 07POSOW0322 Work Order Name: North District One-Foot Orthophoto and LiDAR - Work Order 1 Vendor Name: Woolpert, Inc. The Hernando County LiDAR Final Report may be viewed at: ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/fl/swfwmd 20070111 20070116 Publication date Complete As needed -81.925929 -81.848175 28.350110 28.308789 ISO 19115 Topic Category Elevation None Bathymetry/Topography LiDAR LAS digital terrain model Terrain Model Elevation Surface Laser None US Florida Southwest Florida Hernando 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be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions.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. DTM accuracy specifications are valid only within the Hernando County limits. The user is cautioned that any DTM data falling outside of the Hernando County limits may not meet the accuracy specifications. Southwest Florida Water Management District Mapping and GIS Physical address

2379 Broad Street

Brooksville Florida 34604-6899 USA (352) 796-7211 352-540-6018 8:00 am 5:00 pm Acknowledgement of the Southwest Florida Water Management District would be appreciated in products derived from these data. Woolpert, Inc. 20080415 Refer to SWFWMD MTS Survey Report, FY2007 Digital Orthophoto and LiDAR (dated 4/31/2008). The LiDAR DTM was developed in accordance with the Federal Emergency Management Agency's (FEMA) Guidelines and Specifications for Flood Hazard Mapping Partners, Appendix A: Guidance for Aerial Mapping and Surveying, April 2003, and in accordance with the 2007 SWFWMD LiDAR specifications. All elevation measurements within the bounding coordinates of this XML were used to derive this dataset. Horizontal accuracy shall be tested to meet or exceed a 4.5 foot (1.37 m) horizontal accuracy at 95 percent confidence level using RMSE(r) x 1.7308 as defined by the National Standard for Spatial Data Accuracy (NSSDA). See SWFWMD MTS Report of DOI Survey, FY2007 Digital Orthophoto and LiDAR B089 & L776 (dated 4/31/2008)). Tested vertical accuracy of the LiDAR data is 0.45 ft (13.71 cm) at the 95% confidence level for unobscured locations. See SWFWMD MTS Report of DOI Survey, FY2007 Digital Orthophoto and LiDAR (B089 & L776 (dated 4/31/2008)). Southwest Florida Water Management District Woolpert, Inc. 20060824 Unknown First Model Brooksville, Florida Southwest Florida Water Management District Digital tape media 20060824 Unknown Publication date Ground Condition Unknown The LiDAR data was acquired using a Leica ALS50 from an average altitude of 2,400-feet above ground level to provide an average ground sample distance of 2.1-feet. First and last return data was collected along with the signal return intensity. Two redundant airborne GPS bases stations were utilized during the data acquisition with maximum line-of-sight distance between the base station and aircraft of 20-km. The LiDAR data was reduced using Grafnav (Waypoint Consulting) for GPS post-processing, PosProc (Applanix Crop) for IMU processing, ALS50 Post Processor (LH Systems) to initial LiDAR processing, TerraScan (Terrasolid) for initial point classification, and proprietary Woolpert developed software for refining the point classification and QC. The LiDAR data was reviewed in 3D using a digital photogrammetric work station using ADS40 digital stereo imagery. During the production process, LiDAR data gaps between the flight lines were observed. These gaps between flight lines were corrected by adding photogrametrically compiled mass points. These points are classified as class 10, in the LAS file. In the areas with the compiled mass points, it may be noted that the mass points are not as dense the areas with complete LiDAR coverage. The mass points were compiled at a sufficient density to define the surface to contract specifications. The LAS files contain 5 classifications: 1 = unclassified; 2 = ground; 9 = water; 10 = photogrammetric masspoints; and 11 = swamp and/or wetlands. The class 1 consists of all points not on the ground. Class 2 consists of bare earth points. Class 9 consists of points within water polygons. Class 11 consists of points within swamps and/or wetlands. Class 10 consists of supplementary mass points that were photogrametrically compiled on points features such as peaks or pits, and LiDAR data gaps. These points were created to maintain the accuracy of the DTM. 3D breaklines were collected at the digital photogrammetric workstation during the LiDAR data review. These breaklines were delineated to insure the DTM is hydrologically correct. Hydrologically Enforced Elevation Data is defined as "Hydorenforced TINS, DEMS, or contours ensure that top surfaces of bridges and culverts are cut by stream breaklines so that computer models will accurately represent drainage flow" per FEMA's Appendix A A.4.10. The breaklines were collected for hydrologically significant features as appropriate to support the development of the generation of 2-foot contours meeting National Map Accuracy Standards. The following breakline features were classified and separated: Closed Water Body Features, Linear Hydrographic Features, Coastal Shorelines, Road Features, Soft Features, Obscured Vegetated Areas, Island Features, Overpasses, and Bridges. Per contract specifications, culverts were not collected as part of this project. Therefore continuity of hydrographic features may not be consistent. During final data production and analysis, the occurrence of mound type features in the data set was noted. These areas were checked, and verified to be above ground septic systems. For a complete description of survey methods, processing methods, software, system parameters, and accuracy analysis, see the Florida MTS Report of Specific Purpose Survey, SWFWMD MTS Report of DOI Survey, FY2007 Digital Orthophoto and LiDAR (B089 & L776 (dated 4/31/2008). 2007 John Gerhard Woolpert, Inc. Project Manager Physical address

11315 Corporate Park Blvd., Suite 115

Orlando Florida 32817 USA 407-381-1292 407-384-1185 john.gerhard@woolpert.com 8:00 am - 5:00 pm Dataset copied. L:\MAPPING-GIS\Projects\FY_2007_Projects\B089_L776_North_District_Ortho_LiDAR\PROJECT_FILE\ DELIVERABLES\METADATA\SWFWMD FY2007 Hernando County LiDAR DTM_LAS_041508 Unknown Dataset copied. V:\Hernando_011608\Metadata\SWFWMD FY2007 Hernando County LiDAR_LAS_041508 Unknown Dataset copied. L:\MAPPING-GIS\Projects\FY_2007_Projects\B089_L776_North_District_Ortho_LiDAR\PROJECT_FILE\ DELIVERABLES\METADATA\SWFWMD FY2007 Hernando County LiDAR_LAS_041508 Unknown The NOAA Coastal Services Center (CSC) received the files in LAS format. The files contained Lidar intensity and elevation measurements. The data was in Florida State Plane Projection and NAVD88 vertical datum. CSC performed the following processing to the data to make it available within the LDART Retrieval Tool (LDART): 1. The data were converted from Florida State Plane West coordinates to geographic coordinates. 2. The data were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoid) heights using Geoid 03. 3. The LAS data were sorted by latitude and the headers were updated. 20080424 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 0 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 Point Point feature derived from LiDAR shot Woolpert, Inc. Intensity Measure of reflectance of Laser shot Woolpert, Inc 0 255 Refer to LAS Specification version 1.1 See process steps within this metadata record for specific methodology 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 Southwest Florida Water Management District (SWFWMD), the Coastal Services Center, or its partners. This data can be obtained on-line at the following URL: http://www.csc.noaa.gov/ldart 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. 20080211 20080425 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 This dataset is not valid without the signed and sealed copy of the Florida Minimum Technical Standards Report of Specific Purpose Survey dated 4/31/2008. Please refer to this document for user constraints.