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प्रश्न
The distance is measured on the topographic map. There are two methods of measuring distance on the toposheets,
(i) Direct-method,
(ii) Indirect method.
Measuring straight distance is a direct method and measuring through a winding course is an indirect method. Explain both the methods.
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उत्तर
(i) To measure the straight distance:
To measure the shortest distance between two points on the topographic map along a straight line can be done easily with the help of a pair of divider. Keep the two pointed ends of the divider over line or two points which has to be measured and then carefully keep on scale. Note down the distance on the map in centimetres; then either with the help of the graphical scale which is provided below the toposheet or by using the statement scale distance can be measured in kilometres and metres.
e.g., two places are 5.6 km., apart on the map.
The scale is given 2 cm. = 1 km.
1 cm. = 1/2 km.
5.6 cm. = 1/2 × 5.6
= 2.8 km.
(ii) To measure winding course:
To measure a winding course route is complicated. It has to be measured with the help of a strip of paper or thread e.g., to measure a river in a toposheet take a piece of thread make a knot on one end. At the end of thread (close to knot) mark the point with pen at which you will begin to measure (point A). Put the thread along the line touching as far as possible to measure and keep on marking with ink at turns till the last point. Stretch the thread on the scale line, you will get the ground distance in kilometres and metres, writing the unit of measurement is always important e.g., if the distance calculated between two points is 3.3 km. If asked in kilometres the answer would be 3km., 300m. If asked in metres the answer would be 3300 metres.
संबंधित प्रश्न
What is the difference between the pattern of settlements in 0725 and the settlement of Idarla?
Name two natural features in 0527.
Name the left bank tributary of the main river.
Calculate the distance in kilometres along the cart track between Chitrasani (999747) and Pirojpura (978753).
What do you understand by the term Grid?
Convert the following scales into R.F.
What is Concave Slope and Convex Slope? Explain?
Give the meanings of the important terms used in toposheets.
Study the extract of the Survey of India Map sheet No. 45D/10 and answer the following questions:
- What is the compass direction of Sunset Point from the settlement of Anadra?
- What is the pattern of drainage in grid square 2315?
- Mention any two features seen in the map extract which indicate that the region has seasonal rainfall.
- Calculate the distance, in kilometers, along the metalled road from the causeway in grid square 1715 to the distance stone marked 20 in grid square 1818.
- What advantage does a Representative Fraction have over a verbal scale?
- Give the six figure grid reference of:
- Anjini Devi ka Mandir
- D 1327.
- Name the three different kinds of roads in grid square 2411 and the one in grid square 2515.
- Mention two occupations of the people living in the northern part of the region in the map extract. Give reasons to support your answer.
- What is the difference between the slope in grid square 2115 and the one in 1811? Give a reason for your answer.
- What is the purpose of:
- the fireline in grid square 2316.
- the pipeline in grid square 2209?
- What do the following represent?
- The red square in grid square 2514.
- 4r in grid square 1612,
- Abu is a popular holiday resort. Mention any three features seen in the map extract which attract holidaymakers to Abu.
Answer the following questions on the Survey Sheet Number 45 D/7.
(a) Give six figure grid references of the following:
(i) ∆ 364 (ii) The temple at Rampura
(b) Mention any two features seen in the map extract which show that the region has seasonal rainfall
(c) Calculate the distance in kilometres along the cart-track linking Juvol (923826) and Amiwada (944817).
(d) Which is the chief form of irrigation shown in the map extract? Give an evidence to justify your answer.
(e) Give one reason to explain why the streams in grid square 9478 do not join a river. Identify another grid square in the map extract that has similar streams.
(f) What do the following represent:
(i) Black broken lines in 9575 (ii) Black curved lines in 9879.
(g) Identity two landforms shown by the contours in grid square 9876.
(h) (i) What is the general direction of the Balram Nadi?
(ii) Which bank of the main river does the Balram Nadi join?
(i) What is the main occupation of the people living in the area shown in the map extract? Give one reason to support your answer.
(j) What is meant by scale of a map? What is the scale of the map extract provided to you?
