USGS 20120814 Unknown NRCS TUPELO, MS 1M NPS LIDAR - LAS 1.2 vector digital data TASK NAME:NRCS TUPELO, MS 1M NPS LIDAR LiDAR Data Acquisition and Processing Production Task USGS Contract No. G10PC00057 Task Order No. G12PD000229 Woolpert Order No. 72207 CONTRACTOR: Woolpert, Inc. 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 1.0 meter. The final products include first, last, and at least one intermediate return LAS, full classified LAS and one (1) meter pixel raster DEMs of the bare-earth surface in ERDAS IMG Format. The LiDAR data was acquired from February 07, 2012 to March 05, 2012 This task order consisted of LiDAR data acquisition and processing for the USGS. The task required the LiDAR data to be collected at a nominal pulse spacing (NPS) of 1.0 meter. The LiDAR data was collected to meet the National Standard for Spatial Database Accuracy (NSSDA) accuracy standards. The LiDAR data was provided in 1,500 meters x 1,500 meters tiles in the UTM projection. The LiDAR tile file name was derived from the southwest corner of each tile. The tiles are named based on the US National Grid. 20120207 20120208 20120209 20120211 20120212 20120215 20120217 20120224 20120225 20120226 20120229 20120303 20120304 20120305 ground condition Complete As needed -89.205395 -88.272484 34.602320 32.673012 None LiDAR LAS None United States Mississippi Tupelo No restrictions apply to this data. None. However, 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be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions.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 it's limitations. USGS/NGTOC mailing and physical address
1400 Independence Rd.
Rolla MO 65401 USA (573) 308-654 (573) 308-3810 8:00 a.m. to 5:00 p.m. Central Time Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3 This data is visually inspected by Woolpert, Inc. Complete Horizontal accuracy is +/- 3.8-foot at the 95% confidence level. 3.8 LiDAR system calibration is available in the project report. LAS data covering the Tupelo, MS 1m NPS Lidar Task Order was compared to survey control points to determine the FVA of the LAS Swath and of the Bare-Earth DEM. In addition, this LAS data was compared to supplemental points from categories: Bare Earth Open Terrain, Urban, Tall Weeds/Crops, Brush Lands and Trees, and Forested Fully Grown. LAS Swath Fundamental Vertical Accuracy (FVA) Tested 0.162m (16.2cm) fundamental vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using 0.083m (8.3cm) (Rmse(z) x 1.96000. Bare-Earth DEM Fundamental Vertical Accuracy (FVA) Tested 0.162m (16.2cm) fundamental vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using 0.083m (8.3cm) (Rmse(z) x 1.96000. 0.162m (16.2cm) LAS Swath Fundamental Vertical Accuracy (FVA) Tested 0.162 meters fundamental vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using Rmse(z) x 1.96000. Tested against the TIN. 0.162m (16.2cm) Bare-Earth DEM Fundamental Vertical Accuracy (FVA) Tested 0.162 meters fundamental vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using Rmse(z) x 1.96000. Tested against the DEM. 0.101 (10.1cm) Bare Earth/Open Terrain Land Cover Classification Supplemental Vertical Accuracy (SVA) Tested 0.101 meters supplemental vertical accuracy at the 95th percentile in Bare Earth/Open Terrain. Tested against the DEM. Errors larger than 95th percentile include: Point 2705, Easting 364482.54, Northing 3632895.51, Z-Error 0.11 0.081m (8.1cm) Urban Land Cover Classification Supplemental Vertical Accuracy (SVA) Tested 0.081 meters supplemental vertical accuracy at the 95th percentile in Urban. Tested against the DEM. Urban Errors larger than 95th percentile include: Point 3502, Easting 340832.46, Northing 3784844.07, Z-Error 0.09 Point 3508, Easting 309739.21, Northing 3739728.9, Z-Error -0.19 0.265m (26.5cm) Tall Weeds/Crops Land Cover Classification Supplemental Vertical Accuracy (SVA) Tested 0.265 meters supplemental vertical accuracy at the 95th percentile in Tall Weeds/Crops. Tested against the DEM. Tall Weeds/Crops Errors larger than 95th percentile include: Point 4005, Easting 339779.92, Northing 3719990.19, Z-Error 0.28 0.322m (32.2cm) Brush Lands and Trees Land Cover Classification Supplemental Vertical Accuracy (SVA) Tested 0.322 meters supplemental vertical accuracy at the 95th percentile in Brush Lands and Trees. Tested against the DEM. Brush Lands and Trees Errors larger than 95th percentile include: Point 5502, Easting 308416.23, Northing 3722454.07, Z-Error 0.33 0.128m (12.8cm) Forested and Fully Grown Land Cover Classification Supplemental Vertical Accuracy (SVA) Tested 0.128 meters supplemental vertical accuracy at the 95th percentile in Forested and Fully Grown. Tested against the DEM. Forested and Fully Grown Errors larger than 95th percentile include: Point 6513, Easting 344662.2, Northing 3733983.94Z-Error 0.13 Point 6701, Easting 365404.93, Northing 3628373.32, Z-Error 0.13 0.200m (20.0cm) Consolidated Vertical Accuracy (CVA) Tested 0.200 meters consolidated vertical accuracy at the 95th percentile level, derived according to ASPRS Guidelines for Vertical Accuracy Reporting for LiDAR Data. Tested against the DEM. Based on the 95th percentile error in all land cover categories combined. Point 4005, Easting 339779.92, Northing 3719990.19, Z-Error 0.28 Point 4502, Easting 326700.67, Northing 3774631.17, Z-Error 0.21 Point 4503, Easting 326657.71, Northing 3767037.66, Z-Error 0.23 Point 4512, Easting 320518.31, Northing 3762325.44, Z-Error 0.2 Point 4701, Easting 339114.21, Northing 3662935.72, Z-Error 0.2 Point 5002, Easting 351971.21, Northing 3805998.62, Z-Error 0.2 Point 5003, Easting 340619.04, Northing 3805755.74, Z-Error 0.31 Point 5502, Easting 308416.23, Northing 3722454.07, Z-Error 0.33 Point 5505, Easting 308416.23, Northing 3722454.07, Z-Error 0.24 Using Leica ALS60(LiDAR) system, 233 flight lines of high density data, at a nominal pulse spacing (NPS) of 1 meter, were collected for the NRCS Tupelo, MS (approximately 3,697 square miles). Data Acquisition Height = 6,500 feet AGL - Aircraft Speed = 130 Knots. Multiple returns were recorded for each laser pulse along with an intensity value for each return. A total of fourteen (14) missions were flown during a period of February 07, 2012 through March 05, 2012. Two airborne global positioning system (GPS) base stations were used in support of the LiDAR data acquisition. 18 ground control points were surveyed through static methods. The geoid used to reduce satellite derived elevations to orthometric heights was Geoid09. Data for the task order is referenced to the UTM Zone 16N, North American Datum of 1983 (NAD83), and NAVD88, in Meters. Airborne GPS data was differentially processed and integrated with the post processed IMU data to derive a smoothed best estimate of trajectory (SBET). The SBET was used to reduce the LiDAR slant range measurements to a raw reflective surface for each flight line. The coverage was classified to extract a bare earth digital elevation model (DEM) and separate last returns. In addition to the LAS deliverables, one layer of coverage was delivered in the IMG Format: bare-earth. 20120207 1200 Woolpert, Inc. Geospatial Services mailing and physical address
4454 Idea Center Blvd.
Dayton OH 45430 USA (937) 461-5660 (937) 461-0743 8:00 a.m. to 5:00 p.m. Eastern Time The ALS60 calibration and system performance is verified on a periodic basis using Woolpert's calibration range. The calibration range consists of a large building and runway. The edges of the building and control points along the runway have been located using conventional survey methods. Inertial measurement unit (IMU) misalignment angles and horizontal accuracy are calculated by comparing the position of the building edges between opposing flight lines. The scanner scale factor and vertical accuracy is calculated through comparison of LiDAR data against control points along the runway. Field calibration is performed on all flight lines to refine the IMU misalignment angles. IMU misalignment angles are calculated from the relative displacement of features within the overlap region of adjacent (and opposing) flight lines. The raw LiDAR data is reduced using the refined misalignment angles. 2011 1200 Woolpert, Inc. Geospatial Services mailing and physical address
4454 Idea Center Blvd.
Dayton OH 45430 USA (937) 461-5660 (937) 461-0743 8:00 a.m. to 5:00 p.m. Eastern Time Once the data acquisition and GPS processing phases are complete, the LiDAR data was processed immediately to verify the coverage had no voids. 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. 20120208 1200 Woolpert, Inc. Geospatial Services mailing and physical address
4454 Idea Center Blvd.
Dayton OH 45430 USA (937) 461-5660 (937) 461-0743 8:00 a.m. to 5:00 p.m. Eastern Time The individual flight lines were inspected to ensure the systematic and residual errors have been identified and removed. Then, the flight lines were compared to adjacent flight lines for any mismatches to obtain a homogenous coverage throughout the project area. The point cloud underwent a classification process to determine bare-earth points and non-ground points utilizing "first and only" as well as "last of many" LiDAR returns. This process determined Default (Class 1), Ground (Class 2), Noise (Class 7), Water (Class 9), Ignored Ground (Class 10), Overlap Default (Class 17), and Overlap Ground (Class 18). The bare-earth (Class 2 - Ground) LiDAR points underwent a manual QA/QC step to verify that artifacts have been removed from the bare-earth surface. The surveyed ground control points are used to perform the accuracy checks and statistical analysis of the LiDAR dataset. 20120501 1200 Woolpert, Inc. Geospatial Services mailing and physical address
4454 Idea Center Blvd.
Dayton OH 45430 USA (937) 461-5660 (937) 461-0743 8:00 a.m. to 5:00 p.m. Eastern Time 0 point Universal Transverse Mercator 16 0.999600 -87.0 0.000000 500000 0.000000 coordinate pair 0.000000002220024164500956 0.000000002220024164500956 Meters North American Datum 1983 Geodetic Reference System 80 6378137.000000 298.257222 North American Vertical Datum of 1988 0.000100 meters Explicit elevation coordinate included with horizontal coordinates USGS/NGTOC mailing and physical address
1400 Independence Rd.
Rolla MO 65401 USA (573) 308-3576 (573) 308-3810 8:00 a.m. to 5:00 p.m. Central Time Downloadable Data 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. unknown 20120814 USGS/NGTOC mailing and physical address
1400 Independence Rd.
Rolla MO 65401 USA (573) 308-3576 (573) 308-3810 8:00 a.m. to 5:00 p.m. Central Time FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time Unclassified Unclassified Unclassified