Question

Construct a Conical Projection with One Standard Parallel for an area

bounded by 10° N to 70° N latitudes and 50° W to 50° E longitudes at a scale of

1:100,000,000 when the latitudinal and longitudinal interval is 10°.​

Answer 1

Construction:

• Draw a circle or quadrilateral with a radius of 2.56 cm that is marked with the angles BOE and AOD at 40° standard parallel and COE at 10° intervals. By extending a tangent from B to P and from A to P in the same manner, the two cone sides that touch the earth and form the Standard Parallel at 40° N are AP and BP. The space between parallels is represented by the arc distance CE.
• By measuring the arc distance, one can draw a semicircle. The perpendicular traced from OP to OB is 2. Then we do X-Y. A separate line N-S is taken on which BP distance is drawn indicating standard parallel. The centre meridian is formed by the line NS. By using the arc distance CE, additional parallels are drawn.

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