Question

describe the terms :-

1) contour interval
2) vertical interval
3) horizontal equivalent
4) gradient​

Answer 1

1.contour interval

A contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is the vertical distance or difference in elevation between contour lines. Index contours are bold or thicker lines that appear at every fifth contour line.

2.vertical interval

Vertical Interval is the vertical distance between two contour lines. Horizontal Equivalent is the actual distance between two points on two contour lines.

3.horizontal equivalent

The horizontal distance on the earth's surface between successive contours. The height interval between the successive contours is known as a vertical interval. For a given vertical interval, the smaller the horizontal equivalent, the steeper is the average slope.

4.gradient

the degree of inclination, or the rate of ascent or descent, in a highway, railroad, etc. an inclined surface; grade; ramp. Physics. the rate of change with respect to distance of a variable quantity, as temperature or pressure, in the direction of maximum change.