gov.noaa.csc.maps:2004_USACE_PR_m560 Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Coastal Services Center (CSC) USACE, St. Louis District 2007 Charleston, SC NOAA's Ocean Service, Coastal Services Center (CSC) http://csc-s-maps-q.csc.noaa.gov/dataviewer/viewer.html?keyword=lidar http://www.csc.noaa.gov/lidar http://www.csc.noaa.gov This record describes Light Detection and Ranging (Lidar) data acquired for the island of Puerto Rico. The data were acquired for USACE, St. Louis District by 3001, Inc., between January 10 and February 8, 2004. The mission was flown at a density sufficient to support a maximum final post spacing of 6 feet for unobscured areas. The Puerto Rico LiDAR Survey was collected under the guidance of a Professional Mapper/Surveyor. The Puerto Rico LiDAR dataset will support the creation of Federal Emergency Management Agency (FEMA) Flood Insurance Rate Maps (FIRM) and an integrated ground and surface water model. The Puerto Rico data provided by the NOAA Coastal Services Center via the Digital Coast Data Access Viewer has been reviewed by Center staff as well as other outside parties. The data, as processed and provided by the CSC, have some noted quality issues and some potential accuracy problems. The CSC has not done any further accuracy assessment, but we have received some feedback from other organizations about accuracy and datum issues. Please note that the geoid grids for Puerto Rico, themselves, have a varying level of accuracy. The data is being provided as a 'best available' data set, but should be used with a level of caution. The Lidar QA/QC Quantitative and Qualitative Assessment Report for this data set may be viewed at: ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/pr/lidarqaqcreport_puertorico_final.pdf A footprint of this data set may be viewed in Google Earth at: ftp://ftp.csc.noaa.gov/pub/crs/beachmap/qa_docs/pr/2004_USACE_Puerto_Rico_Lidar.kmz 20040110 20040208 ground condition Complete None planned -67.271346 -65.204146 18.515932 17.913132 ISO 19115 Topic Category elevation None Bathymetry/Topography Elevation Lidar LAS None USA Puerto Rico 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be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions.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. Acknowledgement of USACE, St. Louis District would be appreciated in products derived from these data. 3001, Inc. LiDAR Department mailing and physical address

501 Robert Rd., 2nd floor

Slidell LA 70458 USA (985) 661- 3001 (985) 649- 5082 lidar@3001inc.com 8:00 - 5:00 CDT Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722 Unknown At the end of each flight, the Lidar data was processed to check for complete coverage and to verify that there were no voids in data coverage. 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 (GCP) and filtered LiDAR data points. Filtered LiDAR data has had vegetation and cultural features removed and by analysis represents bare-earth elevations. Testing was performed prior to gridding of the filtered LiDAR data points and construction of the Intergraph .dtm file format. The RMSE figure was used to compute the vertical National Standard for Spatial Data Accuracy (NSSDA). Ground control was established by 3001, Inc. A spatial proximity analysis was used to select edited LiDAR data points contiguous to the relevant GCPs. A search radius decision rule is applied with consideration of terrain complexity, cumulative error and adequate sample size. Cumulative error results from the errors inherent in the various sources of horizontal measurement. These sources include the airborne GPS, GCPs and the uncertainty of the accuracy of the LiDAR data points. This accuracy is achieved prior to the sub-sampling that occurs through integration with the inertial measurement unit (IMU) positions that are recorded. It is unclear at this time whether the initial accuracy is maintained. The horizontal accuracy of the GCPs is estimated to be in the range of approximately 1 to 1.6 feet. Finally, sample size was considered. The specification for the National Standard for Spatial Data Accuracy is a minimum of 20 points to conduct a statistically significant accuracy evaluation (Minnesota Planning, 1999, Positional Accuracy Handbook, Minnesota Planning Land Management Information Center, St. Paul, Minnesota., p.3). Most statistical texts indicate that a minimum of 30 sample points provide a reasonable Approximation of a normal distribution. The intent of the NSSDA is to reflect the geographic area of interest and the distribution of error in the data set (Federal Geographic Data Committee, 1998, Geospatial National Standard for Spatial Data Accuracy, Federal Geographic Data Committee Secretariat, Reston, Virginia, p.3-4). Additional steps were taken to ensure the vertical accuracy of the LiDAR data including: Step 1: Precision Bore sighting (Check Edge-matching) Step 2: Compare the LiDAR data to the Field Survey (Field survey is to FEMA specifications and more stringent internal specifications) Step 3: Automated Filtering Step 4: Manual Editing (Quality Control) Step 5: 3-D digitizing and Photogrammetric Compilation of hydrographic breaklines. 11.90 Based upon the result of vertical accuracy testing conducted by 3001, Inc., vertical accuracy at the 95% confidence level (Accuracyz) is computed by the formula RMSEz x 1.9600. The overall vertical accuracy of the Puerto Rico Lidar dataset is 11.90 cm, based upon an RMSEz of 6.07 cm. These values were derived from a comparison of Lidar data points that fell within a 1 m horizontal radius of 20 established ground control points. They represent the overall vertical accuracy in all surface types surveyed, which include ashphalt, dirt and mowed grass. USACE, St. Louis District 2007 vector digital data online 20040110 20040208 ground condition Raw Lidar Scan Data The Puerto Rico LiDAR Survey was acquired for USACE, St. Louis District and processed by 3001, Inc. The ABGPS, inertial measurement unit (IMU), and raw scans are collected during the LiDAR aerial survey. The ABGPS monitors the xyz position of the sensor and the IMU monitors the orientation. During the aerial survey laser pulses reflected from features on the ground surface are detected by the receiver optics and collected by the data logger. GPS locations are based on data collection receivers on the aircraft and base stations on the ground. The ground base stations are placed no more than 35 km radius from the flight survey area. Raw Lidar Scan Data Airborne Global Positioning System Inertial Measuring Unit Global Positioning System 2007 LiDAR Scan Files 3001, Inc. Lidar Department mailing and physical address

501 Robert Blvd, 2nd Floor

Slidell LA 70458 USA (985) 661-3001 (985) 649-5082 lidar@3001inc.com 8:00 - 5:00 CDT The ABGPS, IMU, and raw scans are integrated using proprietary software developed by the Leica Geosystems and delivered with the Leica ALS50 System. The resultant file is in a LAS binary file format. The LAS file version 1.0 format can easily transferred from one file format to another. It is a binary file format that maintains information specific to the LiDAR data (return#, intensity value, xyz, etc.). The resultant points are produced in the State Plane Puerto Rico FIPS 5200 coordinate system, with units in feet and referenced to the NAD83 horizontal datum and NAVD88 vertical datum. Airborne Global Positioning System Data Inertial Measurement Unit Lidar Scan Files 2007 Point Cloud Lidar LAS 1.0 Format 3001, Inc. Lidar Department mailing and physical address

501 Robert Blvd, 2nd Floor

Slidell LA 70458 USA (985) 661-3001 (985) 649-5082 lidar@3001inc.com 8:00 - 5:00 CDT The unedited data are classified to facilitate the application of the appropriate feature extraction filters. A combination of proprietary filters is applied as appropriate for the production of bare-earth digital terrain models (DTMs). Interactive editing methods are applied to those areas where it is inappropriate or impossible to use the feature extraction filters, based upon the design criteria and/or limitations of the relevant filters. These same feature extraction filters are used to produce elevation height surfaces. Point Cloud Lidar LAS 1.0 Format 2007 Filtered Lidar data Classified Lidar data 3001, Inc. Lidar Department mailing and physical address

501 Robert Blvd, 2nd Floor

Slidell LA 70458 USA (985) 661-3001 (985) 649-5082 lidar@3001inc.com 8:00 - 5:00 CDT Filtered and edited data are subjected to rigorous QA/QC according to the 3001 Inc. Quality Control Plan and procedures. Very briefly, a series of quantitative and visual procedures are employed to validate the accuracy and consistency of the filtered and edited data. Ground control is established by 3001, Inc. and GPS-derived ground control points (GCPs) points in various areas of dominant and prescribed land cover. These points are coded according to landcover, surface material and ground control suitability. A suitable number of points are selected for calculation of a statistically significant accuracy assessment as per the requirements of the National Standard for Spatial Data Accuracy. A spatial proximity analysis is used to select edited LiDAR data points within a specified distance of the relevant GCPs. A search radius decision rule is applied with consideration of terrain complexity, cumulative error and adequate sample size. Accuracy validation and evaluation is accomplished using proprietary software to apply relevant statistical routines for calculation of Root Mean Square Error (RMSE) and the National Standard for Spatial Data Accuracy (NSSDA) according the Federal Geographic Data Committee (FGDC) specifications. Filtered Lidar data Classified Lidar data 2007 Validated Lidar data 3001, Inc. Lidar Department mailing and physical address

501 Robert Blvd, 2nd Floor

Slidell LA 70458 USA (985) 661-3001 (985) 649-5082 lidar@3001inc.com 8:00 - 5:00 CDT The LiDAR mass points were delivered in ASPRS LAS 1.0 format. The header file for each dataset is complete as defined by the LAS 1.0 specification. The LAS files do not include overlap. The delivered tiles are suitable for seamless topographic data mosaics that include no "no data" areas. The names of the tiles are left padded with zeros as required to achieve a five character length and all files utilize the LAS file extension. Validated Lidar Data 2007 Deliverable data 3001, Inc. Lidar Department mailing and physical address

501 Robert Blvd, 2nd Floor

Slidell LA 70458 USA (985) 661-3001 (985) 649-5082 lidar@3001inc.com 8:00 - 5:00 CDT The NOAA Coastal Services Center (CSC) received the files in las format. The files contained Lidar elevation and intensity measurements. The data were in projected in Puerto Rico State Plane Coordinates (FIPS 5200/NAD83), and referenced to the orthometric datum of NAVD88 utilizing Geoid 99. Both planar and vertical units were measured in feet. CSC performed the following processing to the data to make it available within the Digital Coast: 1. The data were converted from State Plane Coordinates (NAD83; ft) to UTM coordinates (Zone 20/NAD83; m). 2. The vertical units of the data were converted from NAVD88 (ft) to NAVD88 (m). 3. The data were re-tiled using MARS software. 4. The data were reclassified such that all classifications were set to Class 0. 5. The data were filtered to Bare Earth (Class 2) and Unclassified (Class 1) using an automated process in LASEdit. 6. The data were converted from UTM coordinates (Zone 20/NAD83) to geographic coordinates (NAD83) and ellipsoidal elevations (GRS80) using Geoid 99. 7. The LAS data were sorted by latitude and the headers were updated. 20101207 NOAA Coastal Services Center Clearinghouse Manager mailing and physical

2234 South Hobson Ave.

Charleston SC 29405-2413 843-740-1210 clearinghouse@noaa.gov 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. 20110503 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 298.257222 Ellipsoid 0.001 Meters Explicit elevation coordinate included with horizontal coordinates LAS Lidar point cloud LAS 1.0 format "ASPRS LAS 1.0 Format Standard, May, 9, 2003" NOAA Coastal Services Center Clearinghouse Manager mailing and physical

2234 South Hobson Ave.

Charleston SC 29405-2413 843-740-1210 clearinghouse@noaa.gov Downloadable Data Any conclusions drawn from the analysis of this information are not the responsibility of the Coastal Services Center or its partners. 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. 20111119 20111119 20121119 NOAA Coastal Services Center Clearinghouse Manager mailing and physical

2234 South Hobson Ave.

Charleston SC 29405-2413 843-740-1210 clearinghouse@noaa.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998