test 2

Question 1

define elevation

Answer 1

vertical distance above or below a reference point

Question 2

define vertical line

Answer 2

parallel to gravity everywhere –> plum bob

Question 3

define horizontal line

Answer 3

tangent to a level line at one point only

Question 4

define level line

Answer 4

a curved line of constant elevation

Question 5

define level surface

Answer 5

constant elevation everywhere ex body of water

Question 6

describe 3 general methods of levelling

Answer 6

1. trigonometric: math- based
2. spirit: alcohol, fluid level
3. barometric: uses change in air pressures

Question 7

describe the 3 team members involved in levelling

Answer 7

1. recorder
2. reader
3. rod holder

Question 8

describe rounding protocol when working with metric and imperial

Answer 8

metric: whatever suits your fancy- up or down
imperial: round to the nearest even number

Question 9

describe how you set up page for finding elevations

Answer 9

STA BS HI FS ELEV

Question 10

how do you find HI

Answer 10

BS + elev –> only for BM

Question 11

how do you find ELEV

Answer 11

HI -FS

Question 12

what does stadia tell us?

Answer 12

1. distance- rough b/c only 2 decimal places
2. angle- to 1/2 degree
3. elevation- actual number for grading plan

Question 13

1 m is equal to

Answer 13

0.32808’

Question 14

what are the 3 ways to level?

Answer 14

1. direct
2. differential
3. stadia

Question 15

what are the 3 general methods of leveling?

Answer 15

1. spirit
2. barometric
3. trigonometric

Question 16

what is the margin of error?

Answer 16

-caused from curve of earth -/+ 0.03

Question 17

4 types of mistakes

Answer 17

1. reading error
2. rod rocking error
3. rod placement error
4. turning points not on hard surface