CMP 305 Exam 1 Questions With Revised
Answers
Types of Leveling - answer- Differential Level
- Profile
- Topographic
Differential Leveling - answerFinding difference in elevation between 2 points
Profile leveling - answerdetermining the elevation of points at measured distances along a
selec...
Differential Leveling - answer✔✔Finding difference in elevation between 2 points
Profile leveling - answer✔✔determining the elevation of points at measured distances along a
selected line
Topographic leveling - answer✔✔determining the elevation of spaced grid points
- uses contour lines
Accuracy of differential leveling depends on...
and common mistake - answer✔✔- centering of bubble
- keeping the rod vertical
- equal sight distances for the BS and FS
- length of sight: be practical
-common mistake: reading wrong foot mark
Types of Levels - answer✔✔construction level
self compensating
construction level - answer✔✔- dumpy 10-20x
- simple
- straight line measurements
Transit and theodolites - answer✔✔- both work in the horizontal and vertical plane
- rotate angles
- vertical measurements
- transit is more traditional, few automated features
- theodolite can read angles ver y accurately of up to 1 sec of an arc
Total station - answer✔✔theodolite with a computer
laser level - answer✔✔- cost is higher than straight line
- distance 500' - 1000'
- adv. only one person is needed to get work done
- can be mounted by construction equipment (ex. dozer)
linear measurements - answer✔✔- pacing
- odometer: wheel
- stadia: length between top and bottom stadia is 1/100 of the distance between the instrument
and the rod
- taping; steel, fiberglass or fabric, length ranges to 500 feet
Record keeping - answer✔✔Field book
- left side is actual instrument readings (numbers)
- right side is picture
site prep - answer✔✔identify special requirements
- historical sites, trees, natural water supply
- storm water run off control
- barriers around trees so they don't die
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