contour

Question 1

Methods of obtaining contours

Answer 1

By Estimation
* Rubber Band Method
* Analytical Method
* Triangle and Scale Method
* Template Method

Question 2

• Suitable for small scale maps where the ground form is not too
  irregular

Answer 2

By estimation

Question 3

The process is fast and produce reasonable results when done
carefully

Answer 3

By estimation

Question 4

Steps in estimation

Answer 4

Steps:
* Make a careful study of the position of the contour points and try to visualize the changes in slope of the terrain
* Draw the contours which appear to be most definitely located by the plotted points; index contours are usually drawn first which will act as guides for the intermediate contours

Question 5

The rubber band should
have sufficient width so
that graduations at equal
intervals can be marked
on it to form some kind of
an elastic scale.

Answer 5

Rubber band method

Question 6

The rubber band is
stretched between two
plotted points so that
these points fall at scale
divisions corresponding
to their elevations

Answer 6

Rubber band method

Question 7

hsubm/de = H/DE

Answer 7

• A & B are established points on the ground of known elevation
• M is a point on a contour crossing the line between A and B
• hm is the horizontal map distance from A to M (cm)
• de is the difference in elevation between M and A (m)
• DE is the difference in elevation between A and B (m)
• H is the horizontal map distance between A and B (cm)

Question 8

• Contour template is a device that allows
  interpolations to be made quickly and accurately

Answer 8

Template Method

Question 9

Contour Template consists of a series of equally
spaced parallel lines that are drawn on transparent
film or paper using any specified scale

Answer 9

Template Method

Question 10

Usually, each fifth or tenth line in the template is
drawn heavier than the rest and correspondingly
numbered

Answer 10

Template Method