possible caption: “flirting before surveying”

“Slope stakes are usually placed at offsets to the toes or tops and the frequency of their occurrence depends upon the grading plan.”

“A GPS clock can be used to ‘discipline’ the local clock on one or more computers. These computers can then act as time servers to keep the clocks of nearby computers accurate.”

inertial geospatial solutions

“originally published by the United States Air Force in 1959. Last revised in 1984, it is now maintained by the National Imagery and Mapping Agency”