Contour Theory Flashcards
Contour Theory
- What is the name for a contour line that is a line on a map that represents points of equal elevation?
- What are Contours used to display?
- isoline
- the shape of the land
Rules for Contour Lines
- Contour lines do not cross one another. Each contour line must close on itself, or end where?
- Is a relatively uniform slope is assumed between contour lines?
- If ground slope is not uniform between lines, then what?
- if the slope is uniform, should contour lines tend to be parallel to one another, and equally spaced?
- the border of the plan.
- yes;
- additional elevations should be measured.
- yes
- Where contour lines are closely spaced, the slope is ? ;
- where they are widely spaced the ground has relatively ??.
- What kind of slop is indicated when the contour lines are close at the top of the slope and further apart at the bottom, they indicate a ? slope.
steep
little slope
concave
- What kind of contour lines are on flat man-made surfaces ?.
- Are Contour lines shown through buildings?
- On a grading plan, existing contours are shown with ? lines.
- What are new contour lines for proposed grades shown as ??
- straight parallel lines
- no
- dashed
- solid lines.
- Hills and depressions both appear as a series of contour lines that are ???.
- Contour elevations will indicate if the ground is a hill or ?.
- Depressions are sometimes distinguished by small ? marks on the low contour line.
- High points on summits and low points in depressions are shown by ? elevations.
- closing on themselves
- depression
- hash
- spot
- Contour lines are often labeled showing the ?.
- T/F: Sometimes, contour lines representing even meters or five meters may be drawn darker than the others (index or main contour).
- When labeling a contour line can you break the line and place the numbers in the line,
- or numbers may be placed on the uphill side of the line.
- elevation
- true
- yes
- yes
Slope Direction
Slope direction is always exactly what to the direction of the contour lines?
T/F:
Of course, you need to just look at the elevation numbers to see which direction the slope is going!
perpendicular
True
Rules for Contour Lines True or false
Contour lines in valleys deflect uphill with a “U” shape?
Contour lines on ridges deflect downhill with a “U“ shape.
False because Contour lines in valleys deflect uphill with a “V” shape
True
- Can a single contour line describe the top of a ridge or the bottom of a valley (this would be similar to a knife-edge, which does not occur in nature).
- Will contour lines running along the highest points on ridges and t_he lowest points in valleys_ be found in pairs and with each having the same elevation and be found on each side of the ridge or valley?
- no it cannot
- yes
Drawing Contour Lines
Are contour lines plotted by proportioning their positions between adjacent grid points?
What is used to find where locations of contour lines cross grid lines?
yes
mathematical interpolation
Random:
DLS
ATS
Dominion Lands Survey and The survey system in Western Canada
Alberta Township System
What appears to be the contour interval for this topographic map?
Answer as Number Only (no UNITS) to 1 decimal place. eg 0.5
0.1
Areas of a topographic map where contour lines are far apart have a lower slope than areas where contour lines are comparatively close together.
Select one:
True
False
true
A contour line on a topographic map must either close in on itself or end at the border of the plan - they can never cross one another.
Select one:
True
False
true
The horizontal distance up a hill is always greater then the slope distance up the same hill?
Select one:
True
False
false
What is one possible direction which water will flow across this site if we assume North is straight up on the diagram?
Answer as 1 or 2 letters only with no spaces. eg: S, NW, SE etc
s
