Dimensions - Winter 2013 - 8
vision: innovation
The LiDAR imagery gives a precise 3-D location of
the transmission lines, a reliable representation of
the bare earth surface, and vegetation above it, to
determine vegetation up-growth or other incursions
into the transmission line right-of-way.
Bringing a Higher Quality of LiDAR
Data to Transmission Line Mapping
Remote Sensing Supports Efficiency and Compliance
According to the North American Electric Reliability Corporation (NERC), vegetation growth is a significant leading
indicator of power outages, as well as a contributing factor in several major system disturbances over the past 50 years.
NERC requires transmission owners to develop and maintain a formal transmission vegetation management program.
Programs must identify and document clearances around vegetation and take into account “transmission line voltage,
the effects of ambient temperature on conductor sag under maximum design loading, and the effects of wind velocities on
conductor sway” (NERC Standard FAC-003-1, April 2006).
As an efficient means to gauge the integrity of existing
points captured along approximately 1,000 linear circuit
power lines and keep track of vegetation growth, airborne
miles, or roughly 20 to 30 measurements per square meter
remote sensing, comprising a LiDAR sensor co-located
along the right-of-way. Reliable and accurate classification
with imaging and temperature sensors, has recently
of the LiDAR point clouds will enable the utility to map the
become a preferred data collection solution for many
position of main line structures and conductors, wires, and
utility companies. The high-resolution data from these
substations, as well as any vegetation up-growth.
sensors support the utilities’ ability to manage vegetation,
The quality assessment of LiDAR image tiles
check line sag, and sense temperature fluctuations along
follows a well-tested process that includes an inventory
transmission corridors, as well as stay compliant with
and file structure assessment, quantitative review of
NERC requirements.
the data through statistical analyses, and qualitative
Dewberry is currently working with a northeastern
imagery using a combination of customized as well as
control of LiDAR and imagery needed to comply with its
commercial-off-the-shelf software. Dewberry also verifies
vegetation management program. Unique to transmission
the LiDAR and ortho imagery data for horizontal and
corridor mapping, the quality assurance and control process
vertical accuracy using independent checkpoints acquired
will verify the integrity of the roughly seven billion LiDAR
8
review of LiDAR data classification, oblique, and ortho
electric utility, providing independent quality assurance and
in various land cover categories.
Dimensions
®
Dimensions - Winter 2013
Table of Contents for the Digital Edition of Dimensions - Winter 2013
Dimensions - Winter 2013
Contents
Spotlight on the Staff: Richard Cawley
Radnor Heights Substation Powers Joint Base Myer-Henderson Hall
Conquering New Ventures: Q&A with Katie Jones
Impacts on Infrastructure: A Quick Look at Issues Likely to Affect Utility Providers
Bringing a Higher Quality of LiDAR Data to Transmission Line Mapping
Performance Briefs
Salt Storage Facility Opens at Tulsa Port of Catoosa
Dimensions - Winter 2013 - Dimensions - Winter 2013
Dimensions - Winter 2013 - Contents
Dimensions - Winter 2013 - Spotlight on the Staff: Richard Cawley
Dimensions - Winter 2013 - Radnor Heights Substation Powers Joint Base Myer-Henderson Hall
Dimensions - Winter 2013 - Conquering New Ventures: Q&A with Katie Jones
Dimensions - Winter 2013 - Impacts on Infrastructure: A Quick Look at Issues Likely to Affect Utility Providers
Dimensions - Winter 2013 - 5
Dimensions - Winter 2013 - 6
Dimensions - Winter 2013 - 7
Dimensions - Winter 2013 - Bringing a Higher Quality of LiDAR Data to Transmission Line Mapping
Dimensions - Winter 2013 - Performance Briefs
Dimensions - Winter 2013 - Salt Storage Facility Opens at Tulsa Port of Catoosa
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