2016 Martin County QL2 Lidar DEM (FL)

Martin County FL QL2 Lidar

Acquisition and Processing Production Task

Task Order No. G14PS00574

Woolpert Order No. 76001

Contractor: Woolpert, Inc.

This task is for a high resolution data set of lidar covering the total task order area of Martin County(566 square miles). The lidar data was acquired and processed under the requirements identified in this task order. The data delivered in this task order is compliant with US. Geological Survey National Geospatial Program Lidar Base Specification Version 1.2. Lidar data is a remotely sensed high resolution elevation data collected by an airborne platform. The lidar sensor uses a combination of laser range finding, GPS positioning, and inertial measurement technologies. The lidar systems collect data point clouds that are used to produce highly detailed Digital Elevation Models (DEMs) of the earth's terrain, man-made structures, and vegetation. The task required the LiDAR data to be collected at a nominal pulse spacing (NPS) of 0.7 meters. The final products include classified LAS, 4 feet pixel raster DEMs of the bare-earth surface in ERDAS IMG Format, and Intensity data delivered in 5,000ft x 5,000ft tiles. Each LAS file contains lidar point information, which has been calibrated, controlled, and classified. Additional deliverables include hydrologic breakline data, bridge abutment breakline data, control data, and tile index provided as ESRI shapefile, lidar processing and survey reports in PDF format, FGDC metadata files for each data deliverable in .xml format, and LAS swath data. Please note that tile 29261 is a coastal tile and contains no lidar points. The data boundary intersects this tile and a hydro breakline was digitized based on this boundary. For this reason a hydro-flattened DEM IMG was generated. There will be no LAS 1.4 or Intensity Tiff for tile 29261. The DEM IMG file count is 768. The LAS 1.4/Intensity Tiff file count is 767. Lidar data acquired during mean low/low tide. Polygon-Z hydro breaklines contain islands as donut-holes. Ground conditions: Water at normal levels; no unusual inundation; leaf off. In addition to the bare earth Digital Elevation Models (DEMs), the lidar point data are also available. These data are available for download here: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=6233 Breaklines created from the lidar are also available by request via email at: coastal.info@noaa.gov. The DEM and breakline products have not been reviewed by the NOAA Office for Coastal Management (OCM) and any conclusions drawn from the analysis of this information are not the responsibility of NOAA, OCM or its partners.

Original contact information:

Contact Org: Woolpert

Phone: (937) 461-5660

The purpose of this County Wide 3D Elevation Program is to support primary and secondary engineering, surveying, flood plain/risk management, emergency services/response, GIS, conservation land restorations, environmental protection, natural and man-made infrastructure improvement initiatives. Data will be utilized for mapping, planning and design on various current and future local, federal, regional, state and water management regional impact initiatives such as FEMA/Flood Plain Mapping, Water Quality, C44 Everglades & Cypress Creek restoration projects, Indian River Lagoon/St. Lucie Estuary environmental protection, beach re-nourishment, flood resilience and mitigation, urban/rural infrastructure planning and improvements projects.

12086

The Martin County QL2 Lidar Project Report may be accessed here:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/6233/supplemental/fl2016_martin_county_m6233_lidar_report.pdf

The Martin County QL2 Lidar Project Survey Control Report may be accessed here: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/6233/supplemental/fl2016_martin_county_m6233_survey_report.pdf

The lidar point data that thes DEMs were created from may be accessed here: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=6233

Breaklines created from the lidar point data, in either gdb or gpkg format, may be accessed here: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/6233/breaklines.

The DEM and breakline products have not been reviewed by the NOAA Office for Coastal Management (OCM) and any conclusions drawn from the analysis of this information are not the responsibility of NOAA, OCM or its partners.

Woolpert prepared the original data as set forth in the Scope of Services, in accordance with reasonable care and due diligence as set forth in this Agreement, however, due to the easily alterable nature of electronic media, files, documents, and other deliverables, Woolpert, Inc. makes no warranties, either expressed or implied, with respect to the accuracy, completeness, merchantability, or fitness for any particular purpose, including, but not limited to, use of any/all data as described within this metadata file, by any user of this data. Any use will be at the end-user's sole risk. Any conclusions drawn from the analysis of this information are not the responsibility of Woolpert, Inc., Martin County, Florida, NOAA, the NOAA Office for Coastal Management (OCM) or its partners.

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=6254;

No restrictions apply to this data.

None. However, users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions. End users should be aware some areas of this project are located in areas exhibiting swamp-like and/or heavily vegetated conditions. In such areas, placement of hydrographic features developed as part of the hydrologic breakline dataset may appear ambiguous. Users should not use these data for critical applications without a full awareness of its limitations.

Microsoft Windows 7 Version 6.1 (Build 7600); ArcMap 10.3; ArcCatalog 10.3; TerraScan ver. 16.01; TerraModeler ver. 16.01; Geocue 2014.1.21; LP360 2015.1. Approximate size of entire delivery dataset = 400 GB

Compiled to meet 0.36 m (1.18 feet) horizontal accuracy at 95 percent confidence level.; Quantitative Value: 0.36 meters, Test that produced the value: Lidar system specifications are available in the project report

LAS data covering the Martin County QL2 Lidar Task Order was compared to independent survey control points to determine the NVA of the LAS Swath and of the Bare-Earth DEM. In addition, this LAS data was compared to independent VVA points. LAS Swath Non-Vegetated Vertical Accuracy (NVA) Tested 0.07 m (0.243 US feet) Non vegetated vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using 0.038 m (0.124 US feet) (RMSEz) x 1.96000 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines. Bare-Earth DEM Non-Vegetated Vertical Accuracy (NVA) Tested 0.08 m (0.264 US feet) Non vegetated vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using 0.04 m (0.135 US feet) (RMSEz) x 1.96000 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines. Relative accuracy also known as "between swath" accuracy was tested through a series of well distributed flight line overlap locations. The relative accuracy for the Martin County Florida QL2 Lidar tested at 0.03 m (0.099 US ft) RMSDz.; Quantitative Value: 0.07 meters, Test that produced the value: LAS Swath Non-Vegetated Vertical Accuracy (NVA) Tested 0.07 m (0.243 US feet) Non vegetated vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using (RMSEz) x 1.96000 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines and tested against the TIN using ground points. ; Quantitative Value: 0.08 meters, Test that produced the value: Bare-Earth DEM Non-Vegetated Vertical Accuracy (NVA) Tested 0.08 m (0.264 US feet) Non-Vegetated vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using (RMSEz) x 1.96000 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines and tested against the DEM.; Quantitative Value: 0.196 meters, Test that produced the value: Vegetated Vertical Accuracy (VVA) Tested 0.196 m (0.642 US feet) at the 95th percentile reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines and tested against the DEM. VVA Errors larger than 95th percentile include:

Point 3023, Easting 761568.448, Northing 1028270.720, Z-Error 0.998 US feet

The lidar data is visually inspected for completeness to ensure that are no void areas or missing data.

All formatted data cover the entire area specified for this project and are validated using a combination of commercial lidar processing software, GIS software, and proprietary programs to ensure proper formatting and loading prior to delivery.