Photo Science, Inc.
Unpublished Material
State of Conneticut UTM Zone 18 (20111203B_240 Raw Flightline): LIDAR for the North East – ARRA and LiDAR for the North East Part II. (USGS Contract: G10PC00026, ARRA LIDAR Task Order Numbers) USGS Contract: G10PC00026 Task Order Number: G10PD02143 Task Order Numbers: G10PD01027 (ARRA) and G10PD02143 (non-ARRA)
model
The LiDAR for the North East Project, funded in large part by the American Recovery and Reinvestment Act (ARRA) of 2009, as well as, other funding sources was designed to help stimulate the U.S. economy and provide for more accurate floodplain mapping in the North East representing the start of a regional LiDAR collection program that served as a test case for a national elevation program. Lead by the United States Geological Survey's (USGS) National Geospatial Program Office and the State of Maine's Office of GIS with active collaboration and participation by other federal, state and local agencies resulted in LiDAR acquisition and processing of over 8,000 sq. miles of (LiDAR) data of a coastal zone spanning six North Eastern states, including Maine, New Hampshire, Massachusetts, Connecticut, Rhode Island, and New York. USGS's National Geospatial Technical Operations Center (USGS NGTOC) in Rolla, MO provided project management and quality control oversight for the project which consisted of two Task Orders issued to USGS contractor, GMR Aerial Surveys inc. d/b/a Photo Science (contractor), for task order execution through the use of USGS's Geospatial Products and Services Contract (USGS Contract: G10PC00026). Task Order specifications included state/area specific vertical accuracy, nominal post spacing and tide coordinated acquisition requirements.
Specific to the State of Conneticut UTM Zone 18, LiDAR was collected in the Winter 2010 through Winter 2011
at a 2 meter or better nominal post spacing (2m GSD) for approximately 455
square miles of Conneticut UTM Zone 18, 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,
Photo Science subcontractor, The James W. Sewall Company, established a total of 11 control
points that were used to calibrate the LIDAR to known ground locations established throughout
the Conneticut UTM Zone 18 project area. Additionally, Sewall established twenty (20) quality control
"blind" check points using survey grade, dual frequency GPS receivers throughout the
Conneticut UTM Zone 18 project area and the contractor supplied the coordinate and elevation
data values for each point to USGS to independently validate theses required vertical
accuracies. These points were not used by the Contractors production team duing any
phase of the project. Conneticut UTM Zone 18 data was developed based on a horizontal projection/datum
of UTM NAD83 (2007), UTM Zone 18, meters and vertical datum of NAVD1988 (GEOID09), meters.
LiDAR data was delivered in RAW flightline swath format, processed to create Classified
LAS 1.2 Files formatted to 598 individual 1500m x 1500m tiles, Hydro Flattening Breaklines
in Esri shape file format, and corresponding 2.0 meter gridded Raster DEM Files tiled to
the same 1500m x 1500m schema. LiDAR Data was originally delivered to USGS for quality
control validation under USGS Delivery Lot 4. The lineage (metadata), positional, content
(completeness), attribution, logical consistency, and accuracies of all digital elevation
data produced conform to the specifications stipulated in USGS Task Orders G10PD01027 (ARRA)
and G10PD02143 (non-ARRA) and the U.S. Geological Survey National Geospatial Program Base
LiDAR Specification, Version 12.
As a result of LiDAR collection in Conneticut UTM Zone 18, flown Winter 2010 through Winter 2011, Raw Flightline LAS files are used to create any project specific datasets. The data is in a raw LAS format.
Classification is only by the means put forth by the software vendor, in this case Optech and Leica. As well, the
flight lines have not been adjusted to meet project specifications in a line-by-line manner. Only initial
calibration values have been used to produce the dataset. Raw Flightline data can be used to create Intensity Images,
tiled LAS files, Breaklines, Bare-earth DEMs, Triangular Irregular Networks, and fully Classified LiDAR LAS files.
20111203
Ground Condition
Unknown
-73.5353481
-73.3613325
41.4029743
41.1516623
none
Model
LiDAR
DEM
Remote Sensing
None
CT
NY
US
None
None. However, users should be aware that temporal changes may have occurred since
this data set was collected and that some parts of the data may no longer represent actual
surface conditions. Users should not use the data for critical applications without a full
awareness of it's limitations.
Photo Science, Inc. flew the LiDAR and processed the data.
Optech DASHMap 5.1000; ALS Post Processor 2.70 Build #15; GeoCue Version 7.0.34.5; Windows XP Operating System
Photo Science, Inc.
Unpublished Material
State of Conneticut UTM Zone 18 (Raster DEM): LIDAR for the North East – ARRA and LiDAR for the North East Part II. (USGS Contract: G10PC00026, ARRA LIDAR Task Order Numbers) USGS Contract: G10PC00026 Task Order Number: G10PD02143 Task Order Numbers: G10PD01027 (ARRA) and G10PD02143 (non-ARRA)
model
Photo Science, Inc.
Unpublished Material
State of Conneticut UTM Zone 18 (Hydro Breaklines): LIDAR for the North East – ARRA and LiDAR for the North East Part II. (USGS Contract: G10PC00026, ARRA LIDAR Task Order Numbers) USGS Contract: G10PC00026 Task Order Number: G10PD02143 Task Order Numbers: G10PD01027 (ARRA) and G10PD02143 (non-ARRA)
model
Photo Science, Inc.
Unpublished Material
State of Conneticut UTM Zone 18 (Classified LAS): LIDAR for the North East – ARRA and LiDAR for the North East Part II. (USGS Contract: G10PC00026, ARRA LIDAR Task Order Numbers) USGS Contract: G10PC00026 Task Order Number: G10PD02143 Task Order Numbers: G10PD01027 (ARRA) and G10PD02143 (non-ARRA)
model
Photo Science, inc.
Unpublished Material
State of Conneticut UTM Zone 18: LIDAR for the North East – ARRA and LiDAR for the North East Part II. (USGS Contract: G10PC00026, ARRA LIDAR Task Order Numbers) USGS Contract: G10PC00026 Task Order Number: G10PD02143 Task Order Numbers: G10PD01027 (ARRA) and G10PD02143 (non-ARRA)
model
The project area required LiDAR to be collected on 2.0 meter GSD
or better and processed to meet a bare earth vertical accuracy of 15.0 centimeters
RMSEz or better.
This lift is in DXR, which has 31 lines flown at 6500 and the following collection parameters:
Base Station: ARP N40;
Airport: Danbury Municipal;
Resolution: 1.389;
Overlap: 1382.2;
PRF: 50;
Scan Angle: 20;
Scan Frequency: 25;
Airspeed: 130;
Sensor SN: 240;
Density: 0.52, represents the planned number of points collected per square meter.
Raw Flightlines were tested by Photo Science for both vertical and horizontal
accuracy. All data are seamless from one tile to the next, no gaps or no data areas.
Datasets contain complete coverage of project area.
Raw Flightlines were tested by Photo Science for both vertical and horizontal
accuracy. All data are seamless from one tile to the next, no gaps or no data areas.
The vertical unit of the data file is in decimal meters with 2-decimal point precision.
The reported RMSEz value was determined using the calibration control points, and not the Blind Control. The calibration control
points are the same points that were used to remove any bias in the dataset before bare earth editing.
Photo Science
2012
LiDAR
digital data
Hard Drive
20111203
ground condition
LiDAR
LiDAR points were used to produce the deliverables.
Applanix software was used in the post processing of the
airborne GPS and inertial data that is critical to the positioning and
orientation of the sensor during all flights. POSPac MMS provides
the smoothed best estimate of trajectory (SBET) that is necessary
for Optech's post processor to develop the point cloud from the
LiDAR missions. The point cloud is the mathematical three dimensional
collection of all returns from all laser pulses as determined from
the aerial mission. At this point this data is ready for analysis,
classification, and filtering to generate a bare earth surface model
in which the above ground features are removed from the data set.
The point cloud was manipulated within the Optech or Leica software; GeoCue,
TerraScan, and TerraModeler software was used for the automated
data classification, manual cleanup, and bare earth generation from
this data. Project specific macros were used to classify the ground
and to remove the side overlap between parallel flight lines.
LiDAR
2012
LiDAR post-processed data
Universal Transverse Mercator
18
0.99960000
-75.00000000
0.00000000
500000.00000000
0.0
coordinate pair
2.0
2.0
meters
North American Datum of 1983
World Geodetic System 1984
6378137.000000000000000000
298.257223563000030000
Initial LAS 1.2 files
RAW files are initial and not completely processed to project specification.
20120329
Photo Science, Inc.
Michael Shillenn
mailing and physical address
523 Wellington Way, Suite 375
Lexington
KY
40503
USA
859-277-8700
mshillenn@photoscience.com
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998