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10. 9. 8. 7. 6. 5. 4. 3. 2. 1. C ONTOURS. What are contours?. Imaginary lines Drawn on a map Connecting places Which are at equal elevation (height above sea level). How are contours drawn?. S. U. R. T. Q. E. P. G. D. F. B. M. A. C. L. I. J. H. O. K. N. 238.

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Presentation Transcript
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slide3
What are contours?
  • Imaginary lines
  • Drawn on a map
  • Connecting places
  • Which are at equal elevation (height above sea level)

How are contours drawn?

slide4
S

U

R

T

Q

E

P

G

D

F

B

M

A

C

L

I

J

H

O

K

N

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contour interval
Contour Interval
  • The difference of elevation between two successive contours
  • Contour interval on the toposheet is 20 meters.
slide8
INDEX CONTOURS

Every 5th contour, with height mentioned

slide9
Characteristics of Contours
  • All places on the contour line lie at the same elevation
  • Contours never intersect each other
  • Contour interval (difference between two successive contour values) is uniform throughout the map
  • All contour values are multiples of the contour interval
  • Height of any place on map can be determined
slide10
Spacing between contours
  • Widely spaced contours
    • Gentle slope
  • Closely packed contours
    • Steep slope
  • Overlapping contours
    • Vertical slope
on to the peak
On to the peak!

300m

200m

100m

any ideas
Any ideas?

Let’sadd contour lines for every 50 meters and see if that helps.

300m

200m

100m

slide23
Now what’s our elevation?

If you said somewhere between 200m and 250m you are right!

350m

300m

250m

200m

150m

100m

50m

slide24
Let’s try this again!

350m

300m

250m

200m

150m

100m

50m

slide25
What’s our elevation now?

If you said 50m or just under, you’re right!

350m

300m

250m

200m

150m

100m

50m

slide32
Think you know our elevation now?

More than 300meters

But less than 350meters

if we were standing on the peak what would be our elevation
If we were standing on the peak, what would be our elevation?
  • More than 350 meters, less than 400 meters
slide36
More than 100 meters,

less than 150 meters

slide39
FORM LINES

Drawn where it is not possible to draw contours and there is a prominent relief feature which is lesser in height than the contour interval

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Uniform Gentle Slope

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Uniform Steep Slope

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Concave Slope

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Features of Contour Diagrams
  • Spacing gives idea of slope
  • Shape of contours resembles shape of relief feature in ariel view
  • It is possible to visualise the shape of the relief feature
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CONICAL HILL

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ASYMMETRICAL HILL

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CIRCULAR PLATEAU

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RIDGE

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SADDLE

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V SHAPED VALLEY

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WATERFALL

slide72
CONTOURS: 45 D/7

9293: Ridge

9289: Ridge (uniform)

9390: Ridge (steep)

9489: Hill

7975: Conical hill

9284: Conical hill

9782: Escarpment

9689: Saddle/ col

9783: Col/ Saddle

45 D/10

1907: Cliff( very steep)

2012: V shaped valley

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