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NAD_1983_StatePlane_Texas_North_Central_FIPS_4202_Feet
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ItemDescription
Woolpert
(937) 461-5660
(937) 461-0743
4454 Idea Center Blvd.
Dayton
OH
45430
US
8:00 a.m. to 5:00 p.m. Eastern Time
20150528
ArcGIS Metadata
1.0
North Central Texas Council of Governments
(817) 695-9156
Unknown
616 Six Flags Dr.
Arlington
TX
76011
US
8:00 a.m. to 5:00 p.m. Central Time
2015 NCTCOG Program Lidar DSM IMG
2015-05-29
Woolpert
raster data
<DIV STYLE="text-align:Left;"><DIV><P><SPAN>TASK NAME: 2015 NCTCOG Program Lidar Data Acquisition and Processing Production Task Woolpert Order No. 74759 CONTRACTOR: Woolpert, Inc. This data set is comprised of lidar point cloud data, raster DEM, raster DSM, classified XYZ, hydrologic 3-d breaklines, raster intensity, survey control, project tile index, and project data extent. This task order requires lidar data to be acquired in the NCTCOG region including 16 counties consisting of Dallas, Tarrant, Collin, Denton, Rockwall, Kaufman, Wise, Johnson, Hood, Erath, Hunt, Navarro, Ellis, Somervell, Palo Pinto, and Parker, which cover approximately 12,800 square miles. The lidar data will be 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 0.5 meters. The final products include classified LAS, two (2) feet pixel raster DEMs of the bare-earth surface in ERDAS IMG Format, two (2) feet pixel raster DSMs in ERDAS IMG Format and 8-bit intensity images. Each LAS file contains lidar point information, which has been calibrated, controlled, and classified. Additional deliverables include hydrologic breakline data, control data, tile index, lidar processing and survey reports in PDF format, FGDC metadata files for each data deliverable in .xml format, classified XYZ , LAS swath data and flightline shapefiles. Collected swath files that were that were larger than 2GB were provided in multiple sub-swath files, each less than 2GB. Ground conditions: Water at normal levels; no unusual inundation; no snow; leaf off.</SPAN></P></DIV></DIV>
The purpose of this project is to provide orthoimagery, LiDAR, and contour services for the 2015 project.
Woolpert
(937) 461-5660
(937) 461-0743
4454 Idea Center Blvd
Dayton
OH
45430
US
8:00 a.m. to 5:00 p.m. Eastern Standard Time
United States
Texas
DSM
IMG
DSM
United States
IMG
Texas
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.
No restrictions apply to this data.
<DIV STYLE="text-align:Left;"><DIV><P><SPAN>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.</SPAN></P></DIV></DIV>
ArcMap 10.2; ArcCatalog 10.2; TerraScan ver. 14.003; TerraModeler ver. 14.003; Geocue 2012.1.27.5; LP360 2011.1.54.1. Approximate size of entire delivery dataset = 3.5 TB
-97.646519
-96.30127
32.261165
33.366059
ground condition
2015-01-06
1
-97.644596
-97.021967
33.122773
32.472497
Woolpert, Tarrant County, NCTCOG
Unclassified
Unclassified
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.
The lidar data is visually inspected for completeness to ensure that are no void areas or missing data.
Compiled to meet 1.10 feet horizontal accuracy at 95 percent confidence level.
Lidar system specifications are available in the project report
1.100 feet
LAS data covering the NCTCOG 2015 Program Lidar 0.5 meter NPS Lidar Task Order was compared to independent survey control points to determine the FVA of the LAS Swath and of the Bare-Earth DEM. Raw LAS Swath Fundamental Vertical Accuracy (FVA) Tested 0.431 feet fundamental vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using 0.220 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 Fundamental Vertical Accuracy (FVA) Tested 0.410 feet fundamental vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using 0.209 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.
LAS Swath Fundamental Vertical Accuracy (FVA) Tested 0.431 feet fundamental 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.
0.431 feet
This data set is the project specified acquired ground control and QAQC control data.
Survey Control Acquistion
2015 NCTCOG Program Lidar
2015-05-29
Gorrondona & Associates, Inc
Austin, Texas
Woolpert
ground condition
2015-01-12
This data set is the project specified acquired point cloud data.
Lidar acquisition
2015 NCTCOG Program Lidar
2015-05-29
Woolpert Geospatial Services
Dayton, OH
Woolpert
ground condition
2015-01-06
This data set is the project specified lidar deliverables.
Lidar deliverable processing
2015 NCTCOG Program
2015-05-29
Woolpert
Woolpert Geospatial Services
Dayton, OH
ground condition
2015-01-07
Using one Leica ALS70 (lidar) system on board a Cessna 310 aircraft, high density data, at a nominal pulse spacing (NPS) of 0.5 meters, were collected for this task order (approximately 12,800 square miles). Leica Specs- AGL = Varies - Aircraft Speed = 135 Knots, Field of View (Full) = 28 degrees, Pulse Rate = 292 kHz, Scan Rate = 49.6 Hz, with an average side lap of 30%. Multiple returns were recorded for each laser pulse along with an intensity value for each return. Twenty-one (21) missions were flown between January 6, 2015 and January 29, 2015. Five (5) Global Navigation Satellite System (GNSS) Base Stations were used in support of the lidar data acquisition. Specific information regarding latitude, longitude, and ellipsoid height to the L1 phase center is included in the lidar processing report. The geoid used to reduce satellite derived elevations to orthometric heights was GEOID12A. Data for the task order is referenced to the North American Datum 1983 (NAD83),Texas State Plane Coordinate System, North Central Zone, and expressed in U.S. Survey Feet. The vertical datum used for this survey will be North American Vertical Datum 1988 (NAVD88). 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. 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. The ALS70 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.
2015-01-06
Woolpert, Inc.
Geospatial Services
(937) 461-5660
(937) 461-0743
4454 Idea Center Blvd.
Dayton
OH
45430
US
8:00 a.m. to 5:00 p.m. Eastern Time
2015 NCTCOG Program Lidar Acquisition
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), Low Vegetation (Class 3), Medium Vegetation (Class 4), High Vegetation (Class 5), Building (Class 6), Noise (Class 7), Water (Class 9), 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 the quality of the DEM as well as a peer-based QC review. This included a review of the DEM surface to remove artifacts and ensure topographic quality. Classification of water (class 9) was completed via the use of the hydrologic breaklines collected for the hydro-flattening phase. The overlap classes were determined by first identifying the overlapping areas and reclassifying the LAS data by offset from a corridor. This allows the returns located on the edge of the swath to be removed from the bare earth coverage in an effort to produce a more uniform data density. The returns determined to be overlap are then further classified to produce overlap default (class 17) and overlap ground (class 18). The surveyed ground control points are used to make vertical adjustments to the data set and to perform the accuracy checks and statistical analysis of the lidar dataset. Supervisory QC monitoring of work in progress and completed editing ensured consistency of classification character and adherence to project requirements across the entire project area. The resulting deliverables for this task order consist of classified LAS file in LAS 1.2 format, Raw Swath LAS files in LAS 1.2 format, two (2) feet pixel size DEM files in ERDAS IMG format, two (2) feet pixel raster DSMs in ERDAS IMG Format, two (2) feet pixel size 8-bit Intensity files in GeoTIFF format, classified XYZ and Hydrologic Breakline data in ESRI shape file format. DSM IMG product was generated utilizing first return data.
2015-01-07
Woolpert, Inc.
Geospatial Services
(937) 461-5660
(937) 461-0743
4454 Idea Center Blvd.
Dayton
OH
45430
US
8:00 a.m. to 5:00 p.m. Eastern Time
2015 NCTCOG Program Lidar Deliverable Processing
Ground control and QAQC control point survey for the 2015 NCTCOG Program was performed by Gorrondona & Associates surveyors, to support the 2015 NCTCOG Program 0.5m NPS Lidar project. All surveys were performed in such a way as to provide a reliable assessment of the LiDAR surface model. These points are carefully planned and selected within and equally distributed over the LiDAR project area. They are located in open terrain, where there is a high probability that the sensor will have detected the ground surface, without influence from the surrounding vegetation. The checkpoint accuracy shall satisfy a Local Network accuracy of 5-centimeters at the 95% confidence level. All horizontal GPS control was based on the Texas State Plane Coordinate System, North Central Zone, NAD-83, expressed in US surveyfeet. The vertical control shall be based on the North American Vertical Datum of 1988 (NAVD 88).
2015-01-13
Gorrondona & Associates, Inc.
Geospatial Services
(512) 719-9933
(512) 719-9944
4201 West Parmer Lane B-100
Austin
TX
78727
US
8:00 a.m. to 5:00 p.m. Eastern Time
2015 NCTCOG Program Lidar ground control and QAQC control Acquisition
EPSG
5.3(9.0.0)
2
1
0
2232280.000000 6858000.000000
2232280.000000 7092496.000000
2421000.000000 7092496.000000
2421000.000000 6858000.000000
2326640.000000 6975248.000000
94360
2.000000
117248
2.000000
Band_1
32
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