706
October 2019
PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING
learn the best practices involved in processing data from UAS.
Finally, on this topic, having GCPs in the aerial triangula-
tion process provides peace of mind. With the proper software,
it can be used to model GPS shift and inertial measurement
unit (IMU) drift and can flag datum compatibility problems.
Having GCPs in place also assists with quality control, ensur-
ing you don’t blindly deliver products of unknown accuracy.
As for the rule I referenced in the journal that requires you
to have at least five GCPs in place to create an accurate map,
that number is not carved in stone. You can have more or few-
er GCPs, based on the project size and shape. This is based on
“There is always the possibility of introducing an
anomaly in the datum conversion between GPS-
based WGS84 and the product’s intended vertical
datum, such as NAVD88”
my research findings and the findings of separate research by
Professor Riadh Munjy of California State University, Fresno.
Five points safely covers a block of imagery from RTK and
non-RTK drones. Four GCPs in the corners results in great
horizontal accuracy especially from non-RTK drones. Adding
a fifth point in the center of the block is the only way to bring
accuracy into the elevation, i.e. Z, in a non-RTK imagery.
**Dr. Abdullah is Chief Scientist and Senior Associate at Woolpert,
Inc. He is ASPRS fellow and the recipient of the ASPRS Life Time
Achievement Award and the Fairchild Photogrammetric Award.
The contents of this column reflect the views of the author,
who is responsible for the facts and accuracy of the data pre-
sented herein. The contents do not necessarily reflect the offi-
cial views or policies of the American Society for Photogram-
metry and Remote Sensing and/or Woolpert, Inc.
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