Underground Infrastructure - May 2023 - 37

EDITION 83 | MAY 2023 | NASSCO.ORG
The main difference in the two technologies is that
photogrammetry uses the images captured to
construct the object being scanned versus LiDAR
which uses a direct measurement based off
physically hitting a feature with light and
measuring the reflection.
Accurate pipe measurements are typically a must
when it comes to inspecting a manhole. Both
technologies are capable of providing accurate
pipe measurements but have their limitations that
should be kept in mind. For photogrammetry to
get an accurate measurement it must be able to
get multiple photos of each pipe to stitch
together. Since most pipes are at the base of the
manhole, it is imperative that you have a camera
that is capable of getting multiple camera views of
the base of the manhole to get those accurate
measurements. On the LiDAR units, the laser
beams sent out from the receiver cannot
penetrate water, so if the pipe is more than half
full of water, it will also be difficult to get an
accurate measurement. This same rule applies for
photogrammetry, as the photos also can not see
through water.
Regardless of any limitation placed on either
inspection technology, rest assured knowing that
you are going to get accurate, quality inspection
from both of them on the majority of structures,
but understanding limitations of each style of unit
will ensure whatever you choose to purchase will
be the correct fit for your system or program.
" The first question
prior to seeking out
any new technology is
what do you want the
deliverable to provide,
and how do you plan
to utilize this
information? "
TECH TIPS IS A BI-MONthly article on
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Underground Infrastructure - May 2023

Table of Contents for the Digital Edition of Underground Infrastructure - May 2023

Underground Infrastructure - May 2023 - 1
Underground Infrastructure - May 2023 - 2
Underground Infrastructure - May 2023 - 3
Underground Infrastructure - May 2023 - 4
Underground Infrastructure - May 2023 - 5
Underground Infrastructure - May 2023 - 6
Underground Infrastructure - May 2023 - 7
Underground Infrastructure - May 2023 - 8
Underground Infrastructure - May 2023 - 9
Underground Infrastructure - May 2023 - 10
Underground Infrastructure - May 2023 - 11
Underground Infrastructure - May 2023 - 12
Underground Infrastructure - May 2023 - 13
Underground Infrastructure - May 2023 - 14
Underground Infrastructure - May 2023 - 15
Underground Infrastructure - May 2023 - 16
Underground Infrastructure - May 2023 - 17
Underground Infrastructure - May 2023 - 18
Underground Infrastructure - May 2023 - 18A
Underground Infrastructure - May 2023 - 18B
Underground Infrastructure - May 2023 - 18C
Underground Infrastructure - May 2023 - 18D
Underground Infrastructure - May 2023 - 19
Underground Infrastructure - May 2023 - 20
Underground Infrastructure - May 2023 - 21
Underground Infrastructure - May 2023 - 22
Underground Infrastructure - May 2023 - 23
Underground Infrastructure - May 2023 - 24
Underground Infrastructure - May 2023 - 25
Underground Infrastructure - May 2023 - 26
Underground Infrastructure - May 2023 - 27
Underground Infrastructure - May 2023 - 28
Underground Infrastructure - May 2023 - 29
Underground Infrastructure - May 2023 - 30
Underground Infrastructure - May 2023 - 31
Underground Infrastructure - May 2023 - 32
Underground Infrastructure - May 2023 - 33
Underground Infrastructure - May 2023 - 34
Underground Infrastructure - May 2023 - 35
Underground Infrastructure - May 2023 - 36
Underground Infrastructure - May 2023 - 37
Underground Infrastructure - May 2023 - 38
Underground Infrastructure - May 2023 - 39
Underground Infrastructure - May 2023 - 40
Underground Infrastructure - May 2023 - 41
Underground Infrastructure - May 2023 - 42
Underground Infrastructure - May 2023 - 43
Underground Infrastructure - May 2023 - 44
Underground Infrastructure - May 2023 - 45
Underground Infrastructure - May 2023 - 46
Underground Infrastructure - May 2023 - 47
Underground Infrastructure - May 2023 - 48
Underground Infrastructure - May 2023 - 49
Underground Infrastructure - May 2023 - 50
Underground Infrastructure - May 2023 - 51
Underground Infrastructure - May 2023 - 52
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