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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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C ONTOURS

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C ontours

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CONTOURS


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What are contours?

  • Imaginary lines

  • Drawn on a map

  • Connecting places

  • Which are at equal elevation (height above sea level)

How are contours drawn?


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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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238

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297

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.300

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285

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289

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Contour interval

Contour Interval

  • The difference of elevation between two successive contours

  • Contour interval on the toposheet is 20 meters.


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INDEX CONTOURS

Every 5th contour, with height mentioned


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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


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Spacing between contours

  • Widely spaced contours

    • Gentle slope

  • Closely packed contours

    • Steep slope

  • Overlapping contours

    • Vertical slope


Let s take a walk up a hill

Let’s take a walk up a hill!


We re now at an elevation of 100 meters

We’re now at an elevation of 100 meters.

100m


Let s keep going

Let’s keep going!

100m


Now we re at 200m

Now we’re at 200m.

200m

100m


Shall we march on

Shall we march on?

200m

100m


We ve made it to 300m

We’ve made it to 300m!

300m

200m

100m


On to the peak

On to the peak!

300m

200m

100m


We re on the peak but what s our elevation

We’re on the peak, but what’s our elevation?

300m

200m

100m


Any ideas

Any ideas?

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

300m

200m

100m


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We know that we are above 350m, but less than 400m.

350m

300m

250m

200m

150m

100m

50m


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Let’s head down the hill, it’s getting late!

350m

300m

250m

200m

150m

100m

50m


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Now what’s our elevation?

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

350m

300m

250m

200m

150m

100m

50m


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Let’s try this again!

350m

300m

250m

200m

150m

100m

50m


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What’s our elevation now?

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

350m

300m

250m

200m

150m

100m

50m


Let s now look at the same hill but the way we might see it from an airplane

Let’s now look at the same hill, but the way we might see it from an airplane!


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Each color change represents a 50 meter increase.


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Now, let’s try the same hike! Our elevation is 0 meters.


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Now what is our elevation?


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If you said more than 150 meters, but less than 200 meters your right!


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Let’s go a little higher.


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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


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Let’s head down hill.


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Know our elevation?


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More than 100 meters,

less than 150 meters


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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


Types of slopes

Types of slopes


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Uniform Gentle Slope


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Uniform Gentle Slope

320

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300

220


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Uniform Steep Slope


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Uniform Steep Slope

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140


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Concave Slope


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Concave Slope

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300


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Convex Slope


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Convex 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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VISUALISATION


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260

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


An escarpment

An Escarpment


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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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