Quantum Spatial
2015
Clinton-Essex-Lake Champlain New York 2015 LiDAR
USGS Contract: G10PC00026 Task Order Number: G10PC00026 and G14PD000943 (Modification)
NY_ClintonEssex_2015
Lidar point cloud
Geographic Extent: Clinton-Essex-Lake Champlain New York, covering approximately 2,699 square miles. The Base order is 1,951 square miles with the Ausable area of interest covering 289 square miles and Saranac area of interest covering 429 square miles.
Dataset Description: Clinton Essex New York 2015 LiDAR project called for the Planning, Acquisition, processing and derivative products of LIDAR data to be collected at a nominal pulse spacing (NPS) of 0.7 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LIDAR Specification, Version 1.0. The data was developed based on a horizontal projection/datum of UTM Zone 18 North, NAD83, meters and vertical datum of NAVD1988 (GEOID12A), meters. LiDAR data was delivered in RAW flight line swath format, processed to create Classified LAS 1.2 Files formatted to 3,266 individual 1500 meter X 1500 meter tiles, corresponding Intensity Images and Bare Earth DEMs tiled to the same 1500 meter X 1500 meter tile schema, and Breaklines in Esri geodatabase format.
Ground Conditions: LiDAR was collected in Fall 2014/Spring 2015, while no snow was on the ground and rivers were at or below normal levels. In order to post process the LiDAR data to meet task order specifications, Quantum Spatial established a total of 104 Land Cover control points that were used to calibrate the LIDAR to known ground locations established throughout the Clinton-Essex-Lake Champlain project area.
Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create Intensity Images, Breaklines and Raster DEM.
The purpose of these lidar data was to produce high accuracy 3D hydro-flattened Digital Elevation Model (DEM) with a 1 meter cell size.
These raw lidar point cloud data were used to create classified lidar LAS files, intensity images, 3D breaklines, contours, hydro-flattened DEMs as necessary.
USGS Contract No. G10PC00026
CONTRACTOR: Quantum Spatial
Ground Control Points were acquired and calibrated by Quantum Spatial
LiDAR data was acquired by both Quantum Spatial and Kucera
Calibration and follow-on processing were completed by Quantum Spatial
USGS-NGP Base Lidar Specification v1.0
Leica ALS 70
4
0.67
2.03
1859
105
20.0
27.3
153.8
4
0.40
1064
0
0.22
1292.09
37.46
NAD_1983_UTM_Zone_18N
National Geodetic Survey (NGS) Geoid12A
USGS-NGP Base Lidar Specification v1.0
Leica ALS 70
4
0.62
2.30
2310
160
14.0
52.2
243.2
4
0.53
1064
1
0.22
1151.90
21.34
NAD_1983_UTM_Zone_18N
National Geodetic Survey (NGS) Geoid12A
USGS-NGP Base Lidar Specification v1.0
Leica ALS 70
4
0.63
1.60
3090
150
20.0
34.6
193.4
4
0.32
1064
0
0.22
1002.13
29.41
NAD_1983_UTM_Zone_18N
National Geodetic Survey (NGS) Geoid12A
USGS-NGP Base Lidar Specification v1.0
Leica ALS 70
4
0.63
2.26
1098
150
20.0
41.0
193.4
4
0.32
1064
0
0.22
1002.00
27.90
NAD_1983_UTM_Zone_18N
National Geodetic Survey (NGS) Geoid12A
USGS-NGP Base Lidar Specification v1.0
Leica ALS 70
4
0.62
2.32
1038
150
19.5
41.5
194.0
4
0.32
1064
0
0.22
974.88
32.38
NAD_1983_UTM_Zone_18N
National Geodetic Survey (NGS) Geoid12A
-9999
0.129
0.114
0.228
High Grass, Weeds, and Crops
0.266
Forested
0.140
Swamp/Wetland
0.315
1.2
1
Withheld (ignore) points were identified in these files using the standard LAS Withheld bit.
Swath "overage" points were identified in these files by adding 128 to the standard classification values.
8
1
Processed, but Unclassified
2
Bare earth ground
7
Noise
9
Water
10
Ignored Ground
17
Bridge Decks
18
High Noise
25
Overlap Water
20141102
20150508
ground condition
None planned
-74.4796547575124
-73.2935471234484
45.0203987866283
43.7756501360771
541500
636000
4986000
4848000
None
model
LAS Point Cloud
remote sensing
Elevation data
Lidar
Hydrology
None
New York
Clinton County
Essex County
Lake Champlain
No restrictions apply to these 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 it's limitations. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data.
Quantum Spatial, Data Acquisition Department
John DiGiovanni
mailing and physical
523 Wellington Way
Lexington
KY
40503
USA
859-277-8700
859-277-8901
jdigiovanni@quantumspatial.com
Monday through Friday 8:00 AM to 5:00 PM (Eastern Time)
If unable to reach the contact by telephone, please send an email. You should get a response within 24 hours.
Quantum Spatial flew the LiDAR and processed the data.
MicroStation Version 8; TerraScan Version 15; TerraModeler Version 15; GeoCue Version 2014.1.21.1; ESRI ArcGIS 10.2; Global Mapper 15; ALS Post Processor 2.75 Build #25; Windows 7 Operating System \\psihq_nx3200\Projects\23902_ClintonEssex_NY_USGS\ 659 GB and \\Matrix\LIDAR\23902_NYClintonEssex_LakeChamplain 2.87 TB
Classified LAS files were tested by Quantum Spatial for both vertical and horizontal accuracy. All data is seamless from one tile to the next, no gaps or no data areas.
Datasets contain complete coverage of tiles.
No points have been removed or excluded.
A visual qualitative assessment was performed to ensure data completeness.
There are no void areas or missing data. The raw point cloud is of good quality and data passes Fundamental Vertical Accuracy specifications.
The specifications require that only Fundamental Vertical Accuracy (FVA) be computed for raw lidar point cloud swath files.
The vertical accuracy value is the AccuracyZ at 95 percent Confidence Interval in meters. The FVA was tested using 25 independent survey check points located in open terrain. The survey checkpoints were distributed throughout the project area. The 25 independent check points were surveyed using GPS techniques. See survey report for additional survey methodologies. Elevations from the unclassified lidar surface were measured for the x,y location of each check point. Elevations interpolated from the lidar surface were then compared to the elevation values of the surveyed control. AccuracyZ has been tested to meet 18.13 cm Fundamental Vertical Accuracy at 95 Percent confidence level using RMSE(z) x 1.9600 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASRPS Guidelines.
0.129
The Raw FVA was tested using 25 independent survey check points located in open terrain. The survey checkpoints were distributed throughout the project area. The 25 independent check points were surveyed using GPS techniques. See survey report for additional survey methodologies. Elevations from the unclassified lidar surface were measured for the x,y location of each check point. Elevations interpolated from the lidar surface were then compared to the elevation values of the surveyed control. The RMSE was computed to be 0.129 meters. AccuracyZ has been tested to meet 18.13 cm Fundamental Vertical Accuracy at 95 Percent confidence level using RMSE(z) x 1.9600 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASRPS Guidelines.
Quantum Spatial
2015
Control Survey Report
vector digital data and tabular data
Lexington, KY
Quantum Spatial
CD-ROM
2015
ground condition
NY_ClintonEssex_2015_LiDAR_ctrl
This data source was used (along with the airborne GPS/IMU Data) to aid in the georeferencing of the lidar point cloud data.
Quantum Spatial
2015
Lidar RAW Data
lidar data
Quantum Spatial
2015
online
20141102
20150508
ground condition
NY_ClintonEssex_2015_LiDAR_Data
This data source was used to populate the lidar point cloud data.
Classified LAS Processing:
The bare earth surface is then manually reviewed to ensure correct classification on the Class 2 (Ground) points. After the bare- earth surface is finalized; it is then used to generate all hydro-breaklines through heads-up digitization.
All ground (ASPRS Class 2) LiDAR data inside of the Lake Pond and Double Line Drain hydro flattening breaklines were then classified to water (ASPRS Class 9) using TerraScan macro functionality. A buffer of 3 feet was also used around each hydro flattened feature to classify these ground (ASPRS Class 2) points to Ignored ground (ASPRS Class 10). All Lake Pond Island and Double Line Drain Island features were checked to ensure that the ground (ASPRS Class 2) points were reclassified to the correct classification after the automated classification was completed.
All overlap data was processed through automated functionality provided by TerraScan to classify the overlapping flight line data to approved classes by USGS. The overlap data was classified through automated processes only and was not verified for classification accuracy. Due to software limitations within TerraScan, these classes were used to trip the withheld bit within various software packages. These processes were reviewed and accepted by USGS through numerous conference calls and pilot study areas.
All data was manually reviewed and any remaining artifacts removed using functionality provided by TerraScan and TerraModeler. Global Mapper is used as a final check of the bare earth dataset. GeoCue was then used to create the deliverable industry-standard LAS files for all point cloud data. Photo Science proprietary software was used to perform final statistical analysis of the classes in the LAS files, on a per tile level to verify final classification metrics and full LAS header information.
NY_ClintonEssex_2015_LiDAR_ctrl
NY_ClintonEssex_2015_LiDAR_Data
2015
Classified LAS
Quantum Spatial
Paul Bishop
mailing and physical
523 Wellington Way
Lexington
KY
40503
USA
859-277-8700
859-277-8901
pbishop@quantumspatial.com
Monday through Friday 8:00 AM to 5:00 PM (Eastern Time)
If unable to reach the contact by telephone, please send an email. You should get a response within 24 hours.
Point
Point
Universal Transverse Mercator
18
0.9996
-75.0
0.0
500000.0
0.0
coordinate pair
0.01
0.01
meter
North American Datum of 1983
Geodetic Reference System 80
6378137
298.257222101
North American Vertical Datum of 1988
0.01
meters
Explicit elevation coordinate included with horizontal coordinates
20151209
Quantum Spatial
Sarah Zibart
mailing and physical
523 Wellington Way
Lexington
KY
40503
USA
859-277-8700
859-277-8901
szibart@quantumspatial.com
Monday through Friday 8:00 AM to 5:00 PM (Eastern Time)
If unable to reach the contact by telephone, please send an email. You should get a response within 24 hours.
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
None.
None.
None.
Unclassified
NONE