Question

Explain the following in points:-
(i) Contour lines.
(ii) Chorographic maps.
(iii) Planimetric maps.

Answer 1

(i) CONTOUR LINES:

1. On a topographic map, a contour line is a line drawn to denote a dip or elevation of the ground. The vertical separation or elevation difference between contour lines is known as a contour interval. Every sixth contour line has an index contour, which is a bolder or thicker line.
2. With the elevation of the ground and the numbers associated with particular contour lines also increase. while with declining contour lines, decline in elevation is also seen.
3. The contour lines turn upstream as they get closer to a stream, canyon, or drainage area. They then cross the stream and make a "v"-shaped turn back along the opposing bank of the stream.

(ii) CHOROGRAPHIC MAPS:

1. Chorography, refers to the geographic description of regions, comes from the writings of the ancient geographers Pomponius Mela and Ptolemy.
2. Concepts of chorography have been linked to a form of visual literacy through imagery that provides a qualitative mapping of place and region. In regard with region's physical characteristics and conformation.
3. According to Darrell Rohl, it is a broad definition of "the depiction of a location or region.

(iii) PLANIMETRIC MAPS:

1. A planimetric map simply displays the features' horizontal positions. It differs from a topographic map in that relief, which is often depicted by contour lines, is absent.
2. It is sometimes referred to as a line map.