Photo Science, Inc.
Unpublished Material
LIDAR and Derivative Products for Genesee County, New York area for
USDA Natural Resources Conservation Service (NRCS) in New York.
model
LiDAR was collected at a 0.5 meter nominal post spacing for approximately 335 square miles of an area generally
encompassing the northern portion of Genesee County, New York. Data was acquired during leaf-off conditions while
no snow was on the ground and rivers were at or below normal levels. The project area required a 0.5 meter nominal
post spacing and a required 9.25cm Vertical Accuracy.
Lifts are planned to meet project specifications and are flown under cloud-free conditions in
order to collect LIDAR points at an average of 0.5 meter point spacing. This allows the user to create
Intensity Images, Breaklines, and fully Classified LiDAR LAS files.
20111213
20120418
ground condition
Unknown
-78.468082
-77.900370
43.135229
42.9370086
none
model
LiDAR
remote sensing
None
Batavia
Genesee County
New York
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this data set was collected and that some parts of this data may no longer represent actual
surface conditions. Users should not use this data for critical applications without a full
awareness of its limitations. Acknowledgement of the USDA Natural Resources Conservation
Service (NRCS) in New York would be appreciated for products derived from these data.
Keystone Aerial Surveys acquired the LiDAR and performed all initial processing of the data.
Photo Science, Inc. performed all post-processing of the data and created all deliverable products.
The project area requires LiDAR to be collected on 0.5 NPS and vertical accuracy
of 9.25 centimeters RMSE or better to support 1' contour generation when combined with breaklines.
Raster DEMs were tested by Photo Science 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.
Raster DEMs were tested by Photo Science for both vertical and horizontal
accuracy. All data is seamless from one tile to the next, no gaps or no data areas.
The vertical unit of the data file is in decimal feet with 2-decimal point precision.
Photo Science, Inc.
2012
LiDAR
digital data
hard drive
20111213
20120418
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 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.
All data was manually reviewed and any remaining artifacts removed
using functionality provided by TerraScan and TerraModeler.
Buffered LAS files were run through automated scripting within ArcMap and were combined
with the Hydro Flattened Breaklines to create the 1 meter DEM. Final DEM tiles were
clipped to the tile boundary to provide a seamless dataset.
ERDAS IMG files were then created as the project deliverable.
A manual QA review of the tiles was completed in ArcMap and Global Mapper to ensure full coverage with
no gaps or slivers within the project area.
LiDAR
2012
LiDAR post-processed data
Universal Transverse Mercator
17
0.99960000
-81.00000000
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
ERDAS IMG files with a 1 meter pixel. No Data values outside of the project area are represented with -9999.
All deliverables meet specifications in contract.
20120810
Photo Science, Inc.
Michael Shillenn
mailing and physical address
104 South Church Street
West Chester
PA
19382
USA
610-344-0890
mshillenn@photoscience.com
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998