Draw one standard parallel conical projection on RF: = 1:125000000 where Standard Parallel = $45^\circ$ latitude extension =$0^\circ -75^\circ\N$Logitudinal extension $60^\circ E - 60^\circ W$, class interval =$15^\circ$

Ans - STEP 1

Assuming Earth’s Radius to be 6350km = 635000000cm

$$R = \frac {635000000}{125000000}= 5.08 cm \approx 5.1 cm$$

• Draw a line AB of length 5.1 cm horizontally .
• Drop a perpendicular from point C to the line AB at point A.

STEP 2

• Make an arc of $90^\circ$ between AB and AC of Radius 5.1cm and center at A.

STEP 3

• Draw an angle $45^\circ$ to line AB called AE , center at A.( ** this is the standard parallel of Latitude ** )
• Draw an angle $15^\circ$ to line AB called AD , center at A.( ** this is the class interval ** )

STEP 4

• Mark off BD ( take the distance along the arc between B and D)
• Draw a circle with center A with radius BD
• Mark the point where the circle cuts the line AE. Call it X.
• Drop a perpendicular from X to the line AC. Call it Y.

STEP 5

• Draw a tangent to the arc at E and produce it towards AC extended until both of them meet.
• Mark the above point H.

STEP 6

• Choose a suitable empty space in the middle of the paper and draw a vertical line.
• Mark the top of the line P.
• Taking center at P draw an arc with radius HE from STEP 5.

STEP 7

• Mark off distance BD from STEP 4 on the vertical line passing through P above and below the arc of the standard parallel done in STEP 6 .
• Draw arcs through each of them with center as P.

STEP 8

• Mark off distance XY from STEP 4 on the arc of the standard parallel arc.
• Join P with the markings on the standard parallel arc.