Contour diagram and cross section are drawn for selected features of the earth. In a continuous landscape one may be interested to visualize the general sky line for an area along a selected path. Profile or a section is a method which helps to visualize the relief feature for a larger area drawn along a selected base line.
Profiles drawn for three or four selected individual base line are called Serial profiles. When profile sections of all serial profiles are drawn on a same vertical baseline it is named as superimposed profile. When one of the serial profile is kept as a base and the elevated portions of successive profiles are drawn it is known as projected profile. The line joining the topmost elevated portions of all the serial profiles drawn on a same base line gives the sky line or summit line for that region.
This is termed as composite profile.
Trace the contours in the toposheet for a size of 10 cm by 10 cm with the contour height.
Select four base lines at a distance of 2.5 cm each. Name them as AB, CD and EF.
Draw the horizontal lines to represent contour with suitable vertical exaggeration.
On this vertically exaggerated figure carefully draw cross sections separately for all the selected lines (AB, CD and EF) as described in the previous section. They are named as serial profile. Draw each section in different colour for better visualisation.
For super imposed profile draw the sections of each line on one vertically exaggerated line with the same colours used as before.
Draw a common vertically exaggerated base line. First draw the cross section of AB line. Next while drawing the cross section of CD line draw only those parts which are the higher than AB line. Next draw the cross section of line EF which lies above the CD line.
Draw these cross sections with the respective colours drawn in serial profiles for better understanding and visualization. This figure gives the projected profile of the selected region.
Composite profile gives the topmost portion of each line joined as one line on the same vertically exaggerated base line.
This gives the effect of the landscape seen from a distance.
Draw serial profile, superimposed profile, projected and composite profile for the given contour diagram.