SOLVE

Objective:

Draw profiles along AB and CD.
Note: Use centimeter graph sheets. Horizontal and Vertical scales are the same.

Pre-requisites:

Topographic map

Description Contour lines: are curved, straight or a mixture of both lines on a map describing the intersection of a real or hypothetical surface with one or more horizontal planes.

STEP 1

Identify the lines about which the profiles are to be drawn.

Lines to be considered for profiles to be drawn:

AB
CD

STEP 2

Mark all the points obtained by the intersection of the dotted line with the line AB and CD of the given contour map.

For AB:

Points	X-Co	Y-Co
a	x1	300
b	x2	400
c	x3	500
d	x4	600
e	x5	600
f	x6	500
g	x7	400
h	x8	300
i	x9	300
j	x10	400
k	x11	500
l	x12	500
m	x13	400
n	x14	300

Points	X-Co	Y-Co
a	x1	200
b	x2	300
c	x3	400
d	x4	500
e	x5	500
f	x6	400
g	x7	300
h	x8	200

STEP 3

Identify X-axis and Y-axis taking X as origin and define scale.

STEP 4

For AB profile line: Plot the points taking its distance from X as x coordinate and the index values of the corresponding line as y coordinate.

Points	X-Co	Y-Co
a	50	300
b	160	400
c	240	500
d	350	600
e	520	600
f	620	500
g	720	400
h	840	300
i	930	300
j	1040	400
k	1130	500
l	1260	500
m	1350	400
n	1470	300

STEP 5

For AB profile line: Draw a line perpendicular to x axis passing through Y’, Now the graph shall bound between the y axis and the line through Y’. Join all the plotted points on the graph free hand.

STEP 6

For CD profile line: Plot the points taking its distance from X as x coordinate and the index values of the corresponding line as y coordinate.

Points	X-Co	Y-Co
a	50	200
b	150	300
c	260	400
d	360	500
e	580	500
f	830	400
g	1130	300
h	1350	200

STEP 7

For CD profile line: Draw a line perpendicular to x axis passing through Y’, Now the graph shall bound between the y axis and the line through Y’. Join all the plotted points on the graph free hand.

Profile View Graphs

Contour Map Geographical Profile along AB Geographical Profile along CD

Points	X-Co	Y-Co
a	x1	300
b	x2	400
c	x3	500
d	x4	600
e	x5	600
f	x6	500
g	x7	400
h	x8	300
i	x9	300
j	x10	400
k	x11	500
l	x12	500
m	x13	400
n	x14	300

Points	X-Co	Y-Co
a	x1	300
b	x2	400
c	x3	500
d	x4	600
e	x5	600
f	x6	500
g	x7	400
h	x8	300
i	x9	300
j	x10	400
k	x11	500
l	x12	500
m	x13	400
n	x14	300

CONTOUR MAP

Objective:

Pre-requisites:

Profile View Graphs

Points	X-Co	Y-Co
a	x1	300
b	x2	400
c	x3	500
d	x4	600
e	x5	600
f	x6	500
g	x7	400
h	x8	300
i	x9	300
j	x10	400
k	x11	500
l	x12	500
m	x13	400
n	x14	300