2015 USGS Lidar DEM: 3DEP Co-Op South Central MS

Mississippi Coastal QL2 Lidar with 3DEP Extension Lidar 0.7m NPS Lidar Data Acquisition and Processing Production Task USGS Contract No. G10PC00057

Task Order No. G15PD00091

Woolpert Order No. 75157

CONTRACTOR: Woolpert, Inc.

This metadata record describes the 1m bare earth Digital Elevation Models (DEMs)for the following counties in Mississippi: Copiah, Lawrence, Lincoln, Pike, and Simpson.

This task is for a high resolution data set of lidar covering approximately 5981 square miles. The lidar data was acquired and processed in compliance to U.S. Geological Survey National Geospatial Program Lidar Base Specification version 1.2. The lidar data was acquired and processed under the requirements identified in this task order. 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, one (1) meter pixel raster DEMs of the bare-earth surface in ERDAS IMG Format, and 8-bit intensity images. Gridded products conform to a 1500 m x 1500 m tiling scheme. Each LAS file contains lidar point information, which has been calibrated, controlled, and classified. Additional deliverables include hydrologic breakline data, control data, flight line vectors 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. Ground conditions: Water at normal levels; no unusual inundation; no snow; leaf off.

In addition to the bare earth DEMs, the topobathy lidar point data are also available. These data are available for custom download here: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=6306

Breaklines created from the lidar area also available for download in both gdb and gpkg format at: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/6306/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.

Original contact information:

Contact Org: Woolpert

Phone: (937) 461-5660

The purpose of this project is for lidar mapping services in support of the USGS for task name Mississippi Coastal QL2 Lidar with 3DEP Extension Lidar Task Order

12105

The Mississippi Coastal QL2 Lidar with 3DEP Extension Lidar Report, may be accessed here: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/6306/supplemental/ms2015_usgs_3dep_coop_m6306_lidar_report.pdf

The Mississippi Coastal QL2 Lidar with 3DEP Extension Ground Control Survey Report, may be accessed here: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/6306/supplemental/ms2015_usgs_3dep_coop_m6306_survey_report.pdf

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., the U.S. Geological Survey (USGS), the MS Dept of Environmental Quality, 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=6307;

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. Users should not use these data for critical applications without a full awareness of its limitations. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data.

Microsoft Windows 7 Version 6.1 (Build 7600); ArcMap 10.2; ArcCatalog 10.2; TerraScan ver. 15.01; TerraModeler ver. 15.01; Geocue 2014.1.21; LP360 2014.1. Approximate size of entire delivery dataset = 3.0TB

Compiled to meet 0.36 meters 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 Mississippi Coastal QL2 Lidar with 3DEP Extension 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. Raw LAS Swath Non-Vegetated Vertical Accuracy (NVA) Tested 0.176 meters non-vegetated vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using 0.090 meters (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 0.164 meters non-vegetated vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using 0.084 meters (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.; Quantitative Value: 0.176 meters, Test that produced the value: Raw Swath Non-Vegetated Vertical Accuracy (NVA) Tested 0.176 meters 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 all points.; Quantitative Value: 0.164 meters, Test that produced the value: Bare-Earth DEM Non-Vegetated Vertical Accuracy (NVA) Tested 0.164 meters 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: 0.239 meters, Test that produced the value: Vegetated Vertical Accuracy (VVA) Tested 0.239 meters 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 3017, Easting 814793.008, Northing 3535747.708, Z-Error 0.308 meters

Point 3031, Easting 725518.905, Northing 3472151.735, Z-Error 0.296 meters

Point 3041, Easting 780357.999, Northing 3545844.660, Z-Error 0.241 meters

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.