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