South Carolina DNR
201107
Unknown
LiDAR_2011_Contour
vector digital data
LiDAR_2011_Contour
withheld
Towill Inc. collected LiDAR for over 3,500 square miles in York, Pickens, Anderson, and Oconee Counties in South Carolina. This metadata covers the LiDAR produced for York County. The nominal pulse spacing for this project was 1.4 meters. This project was collected with a sensor which collects waveform data and provides an intensity value for each discrete pulse extracted from the waveform. GPS Week Time, Intensity, Flightline and echo number attributes were provided for each LiDAR point. Dewberry used proprietary procedures to classify the LAS according to contract specifications: 1-Unclassified, 2-Ground, 7-Noise, 8-Model Key Points, 9-Water, 10-Ignored Ground due to breakline proximity. Dewberry produced 3D breaklines and combined these with the final LiDAR data to produce seamless hydro flattened DEMs for the 1,018 tiles (5000 ft x 5000 ft) that cover the project area.
The purpose of this LiDAR data was to produce high accuracy 3D elevation products, including tiled LiDAR in LAS 1.2 format, 3D breaklines, and 10 ft cell size hydro flattened Digital Elevation Models (DEM).
A complete description of this dataset is available in the Final Project Report.
en
20110308
20110615
REQUIRED: The year (and optionally month, or month and day) for which the data set corresponds to the ground.
ground condition
As needed
-81.493150
-80.864892
35.165341
34.819516
1852573.769780
2040385.000128
1086875.000137
1212405.000061
None
DTM
Elevation
Lidar
LAS
DEM
Hydro Flattened
Breaklines
None
South Carolina
York County
None
This data was produced for the SCDNR according to specific project requirements. This information is provided "as is". Further documentation of this data can be obtained by contacting: Jim Scurry, 1000 Assembly St. Suite 134, Columbia, SC 29201. Telephone (803) 734-9494.
Jim Scurry
S.C. Dept. of Natural Resources
mailing and physical address
1000 Assembly St. Suite 134
Columbia
South Carolina
29201
United States
803.734.9494
scurryj@dnr.sc.gov
8:00 AM - 5:00 PM
ESRI ArcCatalog 9.3.1.4000
Feature Class
Data covers the tile scheme provided for the project area.
A visual qualitative assessment was performed to ensure data completeness and bare earth data cleanliness. No void or missing data, the bare earth surface is of good quality and data passes vertical accuracy specifications.
Lidar source compiled to meet 1 m horizontal RMSE.
1 meter
Dewberry does not perform independent horizontal accuracy testing on the LiDAR. LiDAR vendors perform calibrations on the LiDAR sensor and compare data to adjoing flight lines to ensure LiDAR meets the 1 m horizontal accuracy standard at the 95% confidence level. Please see the final project report for more details.
The vertical accuracy of the LiDAR was tested by Dewberry with 124 National Geodetic Survey checkpoints. The checkpoints were downloaded from the NGS website (www.ngs.noaa.gov). The survey checkpoints were evenly distributed throughout the project area and were located in areas of either urban or open terrain.
The RMSE in feet for the York County dataset is 0.25 ft. The Fundamental Vertical Accuracy (RMSEz x 1.9600) is 0.50 ft.
0.25 ft
The vertical accuracy of the LiDAR was tested by Dewberry with 124 National Geodetic Survey checkpoints. The checkpoints were downloaded from the NGS website (www.ngs.noaa.gov). The survey checkpoints were evenly distributed throughout the project area and were located in areas of either urban or open terrain.
The RMSE in feet for the York County dataset is 0.25 ft. The Fundamental Vertical Accuracy (RMSEz x 1.9600) is 0.50 ft.
Dewberry
20110617
SC DNR York County
One
map
Fairfax, VA
Dewberry
withheld
Hard Drive
201103
201103
Ground Condition
none
LiDAR data representing the SC DNR Task Order to be used for various analysis and research purposes.
Towill Inc. employed an Optech Orion M-200 Lidar system in the acquisition of this Lidar data.
The planned acquisition parameters were as follows:
Target altitude - 1500 meters AMT; System PRF - 70kHz; Scan Half Angle - 20 degrees; Scan Rate - 38 hertz; Aircraft Speed - 150 knots; Target sidelap - 50 percent.
All missions originated and/or terminated at the Rock Hill Airport. A GPS base station was operating at the airport during every lift. The South Carolina Geodetic Survey, was contacted prior to the start of the Lidar acquisition to arrange for 1 Hertz data logging of several of the active CORS stations included in the primary survey network. The data from these stations were downloaded and applied in the post-processing of the kinematic Airborne GPS (AGPS) data.
Airborne GPS and Inertial Measurement Unit (IMU) data were acquired by the Applanix POS Inertial Navigation System during the missions. The post-processed POS data results in a 200 Hertz, 6-parameter
aircraft trajectory (x, y, z, roll, pitch, yaw).
The AGPS and IMU data were processed immediately following each mission. In addition, a sample of the Lidar data was post-processed at the completion of the missions and the data were reviewed to ensure correct system operation and data coverage.
withheld
withheld
20110414
withheld
Towill, Inc.
Keith Kirkby
Geodetic Engineer
mailing and physical address
1120 Elkton Dr. Suite G
Colorado Springs
Colorado
80907
USA
719-355-1150 x403
719-355-1155
keith.kirkby@towill.com
Monday to Friday, 8:00 - 5:00, Mountain Time
The kinematic AGPS data were post-processed using Novatel, Inc.’s Grafnav version 8.20 software, the de facto kinematic GPS post-processing package in the airborne remote sensing industry.
The post-processed AGPS trajectory is combined with the raw 200 Hertz IMU observations in a loosely-coupled Kalman filter-based processing algorithm to produce the final high-frequency Smoothed Best Estimated Trajectory (SBET). Applanix’s POSPac software, version 4.4, is employed in this process.
Final Lidar data processing is accomplished using Optech’s DASHMap software, version 5.01.
withheld
20110414
withheld
Towill, Inc.
Keith Kirkby
Geodetic Engineer
mailing and physical address
1120 Elkton Dr. Suite G
Colorado Springs
CO
80907
USA
719-355-1150 x403
719-355-1155
keith.kirkby@towill.com
Monday to Friday, 8:00 - 5:00, Mountain Time
Dewberry utilizes a variety of software suites for inventory management, classification, and data processing. All LiDAR related processes begin by importing the data into the GeoCue task management software. GeoCue allows the data to retain its delivered tiling scheme (5000 ft by 5000 ft). The tiled data is then opened in Terrascan where Dewberry uses proprietary ground classification routines to remove any non-ground points and generate an accurate ground surface. The ground routine consists of three main parameters (building size, iteration angle, and iteration distance); by adjusting these parameters and running several iterations of this routine an initial ground surface is developed. The building size parameter sets a roaming window size. Each tile is loaded with neighboring points from adjacent tiles and the routine classifies the data section by section based on this roaming window size. The second most important parameter is the maximum terrain angle, which sets the highest allowed terrain angle within the model. Once the ground routine has been completed a manual quality control routine is done using hillshades, cross-sections, and profiles within the Terrasolid software suite. After this QC step, a peer review and supervisor manual inspection is completed on a percentage of the classified tiles based on the project size and variability of the terrain. After the ground classification corrections were completed, the dataset was processed through a water classification routine that utilizes breaklines compiled by Dewberry to automatically classify hydrographic features. The water classification routine selects ground points within the breakline polygons and automatically classifies them as class 9, water. During this water classification routine, points which are in close proximity (1 m) to the hydrographic features are moved to class 10, an ignored ground. In addition to classes 1, 2, 8, 9, and 10, the project allows for a Class 7, noise points. This class was only used if needed when points could manually be identified as low/high points.
The fully classified dataset is then processed through Dewberry's comprehensive quality control program.
The data was classified as follows:
Class 1 = Unclassified. This class includes vegetation, buildings, noise etc.
Class 2 = Ground
Class 7= Noise
Class 8= Model Key Points
Class 9 = Water
Class 10= Ignored Ground
The LAS header information was verified to contain the following:
Class (Integer)
GPS Week Time (0.0001 seconds)
Easting (0.001 m)
Northing (0.001 m)
Elevation (0.001 m)
Echo Number (Integer 1 to 4)
Echo (Integer 1 to 4)
Intensity (8 bit integer)
Flight Line (Integer)
Scan Angle (Integer degree)
withheld
201106
withheld
Jeff Poplin
Dewberry - Geospatial Services Group
Project Manager
mailing and physical address
8401 Arlington Blvd.
Fairfax
VA
22031
USA
703.849.0100
703.849.0182
jpoplin@dewberry.com
8:00 - 5:00 EST
Metadata imported.
withheld
20120327
08581700
Vector
Simple
FALSE
0
TRUE
FALSE
coordinate pair
0.000328
0.000328
survey feet
North American Datum of 1983
Geodetic Reference System 80
6378137.000000
298.257222
GCS_North_American_1983
NAD_1983_StatePlane_South_Carolina_FIPS_3900_Feet
North American Vertical Datum of 1988
1.000000
feet
Explicit elevation coordinate included with horizontal coordinates
LiDAR points in LAS 1.2 format
none
Elevation_2011
Feature Class
0
OBJECTID
OBJECTID
OID
4
10
0
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Shape
Shape
Geometry
8
0
0
Feature geometry.
ESRI
Coordinates defining the features.
Elevation_Feet
Elevation_Feet
Double
8
38
8
Contour_Intervals
Contour_Intervals
String
50
0
0
Label
Label
String
50
0
0
Shape.STLength()
Shape.STLength()
Double
0
0
0
Jim Scurry
S.C. Dept. of Natural Resources
mailing and physical address
1000 Assembly St. Suite 134
Columbia
South Carolina
29201
United States
803.734.9494
scurryj@dnr.sc.gov
8:00 AM - 5:00 PM
Downloadable Data
This data was produced for the USGS according to specific project requirements. This information is provided "as is". Further documentation of this data can be obtained by contacting: USGS/NGTOC, 1400 Independence Road, Rolla, MO 65401. Telephone (573) 308-3587.
20120327
Jim Scurry
S.C. Dept. of Natural Resources
mailing and physical address
1000 Assembly St. Suite 134
Columbia
South Carolina
29201
United States
803.734.9494
scurryj@dnr.sc.gov
8:00 AM - 5:00 PM
REQUIRED: The person responsible for the metadata information.
REQUIRED: The organization responsible for the metadata information.
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile
en
20181208
13031900
FALSE
20221207
15033700
20221207
15033700
1.0
Elevation_2011
002
1852577.475066
2040389.081037
1086877.173885
1212407.424869
1
Projected
GCS_North_American_1983
Linear Unit: Foot (0.304800)
NAD_1983_StatePlane_South_Carolina_FIPS_3900_Feet_Intl
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FGDC CSDGM Metadata
Esri ArcGIS 13.0.0.36056
Elevation_2011
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2040385.000128
1212405.000061
1086875.000137
1
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35.165341
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35.165341
34.819516
ISO 19115 Geographic Information - Metadata
DIS_ESRI1.0
dataset
002
withheld
Feature Class
Enterprise Geodatabase Feature Class
NAD_1983_StatePlane_South_Carolina_FIPS_3900_Feet
EPSG
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