Contours

Geom 5072 creating contours

contours

Contours from plan symbolise projections of horizontal strata.

feature survey

from the previous exercise...

level survey

....establish a 5x5m grid

level survey

....place the survey staff along the intersecting points and record sighting (lines)

level survey

....a temporary benchmark will be assigned

resolve levels

....use a spreadsheet back in class, and ensure accurately transcribed values.

level survey

At each interval record the resolved level

(RL)

level survey

We need to work out along each line the RL @ 200mm increments...

level survey RL: 101.890

RL: 101.496

We need to work out along each line the RL @ 200mm increments...

For this segment the points 101.600 & 101.800

level survey RL: 101.890

Y2 R

Y1

RL: 101.496

ratio

X

Y=394mm X= 5000mm R=0.0788

Y

level survey RL: 101.890

RL: 101.800

RL: 101.600 R RL: 101.496 104/0.0788= 1320 304/0.0788= 3860

Y2 Y1

X

Y1=104mm Y2= 304mm

Y

level survey

Points are placed along lines.

join the dots