USI Exam Revision Questions with Correct
Answers .
1. What is "Ground Sample Distance?: The size of a pixel projected on the ground.
2. What variables make up the formula for calculating "Ground Sample Dis-
tance?: Sensor altitude, sensor width, image width, focal length
3. Can you compare the relative and absolute accuracy of geospatial data used
in RPAS operations?: Relative accuracy is the consistency of spatial relations in
images and absolute is the accuracy relative to known ground coordinates
4. What do "camera depression angle" and "azimuth" mean in the context of
RPAS operations?: Depression angle is the angle from the sensor to the ground
and azimuth is the angle on the horizontal plane, or left and right
5. What is the difference between a low oblique and a high oblique aerial
image?: A low oblique aerial image is one where the horizon is not visible, as the
camera is almost directly below, and high oblique images are at a high depression
angle, looking at the horizon
6. What are the units of measurement commonly used in RPAS operations
for altitude, airspeed, distance, time, meteorological, and atmospheric condi-
tions?: AGL, knots, meters or nautical or statute miles, zulu time, knots of winds,
inches of mercury
7. What coordinate systems are commonly employed in RPAS operations,
and how are these systems used to determine the position of a point on
the Earth's surface?: Geographic coordinate system, which uses latitude and
longitude coordinates, Universal transversal mercator, which uses their easting and
northing coordinates to find a location, separating the earth into 60 zones.
8. How do the objectives of aerial survey missions differ from those of aerial
inspection missions?: Aerial survey views large areas to survey them, and aerial
inspection missions closely inspect wear and tear, integrity, corrosion, and potential
risks.
9. What is the difference between "front lap" and "side lap" in relation to an
aerial survey mission?: A front lap is the first pass of the area of operations, a side
lap is the last pass of that same area of operations, off to the side.
10. What is the generic workflow used to plan and execute an RPAS mission?-
: Develop a preliminary plan, visit the worksite and gather in situ data, and then
conduct a safety review of the hazards and issues identified during the first two
steps.
11. Differentiate between "area of interest" and "area of operation" regarding
1/7
, RPAS mission planning.: The area of interest is the specific targets that the RPAS
crew want to survey, while area of operations is used to identify potential hazards
as to where the AV will operate
2/7
Answers .
1. What is "Ground Sample Distance?: The size of a pixel projected on the ground.
2. What variables make up the formula for calculating "Ground Sample Dis-
tance?: Sensor altitude, sensor width, image width, focal length
3. Can you compare the relative and absolute accuracy of geospatial data used
in RPAS operations?: Relative accuracy is the consistency of spatial relations in
images and absolute is the accuracy relative to known ground coordinates
4. What do "camera depression angle" and "azimuth" mean in the context of
RPAS operations?: Depression angle is the angle from the sensor to the ground
and azimuth is the angle on the horizontal plane, or left and right
5. What is the difference between a low oblique and a high oblique aerial
image?: A low oblique aerial image is one where the horizon is not visible, as the
camera is almost directly below, and high oblique images are at a high depression
angle, looking at the horizon
6. What are the units of measurement commonly used in RPAS operations
for altitude, airspeed, distance, time, meteorological, and atmospheric condi-
tions?: AGL, knots, meters or nautical or statute miles, zulu time, knots of winds,
inches of mercury
7. What coordinate systems are commonly employed in RPAS operations,
and how are these systems used to determine the position of a point on
the Earth's surface?: Geographic coordinate system, which uses latitude and
longitude coordinates, Universal transversal mercator, which uses their easting and
northing coordinates to find a location, separating the earth into 60 zones.
8. How do the objectives of aerial survey missions differ from those of aerial
inspection missions?: Aerial survey views large areas to survey them, and aerial
inspection missions closely inspect wear and tear, integrity, corrosion, and potential
risks.
9. What is the difference between "front lap" and "side lap" in relation to an
aerial survey mission?: A front lap is the first pass of the area of operations, a side
lap is the last pass of that same area of operations, off to the side.
10. What is the generic workflow used to plan and execute an RPAS mission?-
: Develop a preliminary plan, visit the worksite and gather in situ data, and then
conduct a safety review of the hazards and issues identified during the first two
steps.
11. Differentiate between "area of interest" and "area of operation" regarding
1/7
, RPAS mission planning.: The area of interest is the specific targets that the RPAS
crew want to survey, while area of operations is used to identify potential hazards
as to where the AV will operate
2/7
