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Contour Lines:


Contour Lines -
1. A contour line of a function of two variables is a curve along which the function has a constant value.
2. In cartography, a contour line joins points of equal elevation (height) above a certain fixed level. This fixed level is often sea level.
3. A contour map is a map illustrated with contour lines, for example a topographic map.
4. The contour interval of a contour map is the difference in elevation between successive contour lines.

5. An Isoline is a line on a map, chart, or graph connecting points of equal value.

Types of Contour Lines:

1. Isopleth - A line drawn on a map through all points having the same numerical value, as of a population figure or geographic measurement.
2. Isohyet - A line drawn on a map connecting points having the same amount of rainfall in a given period.
3. Isobar - A line drawn on a map connecting points having the same atmospheric pressure at a given time.
4. Isobath - A line drawn on a map connecting all points of equal depth below the surface of a body of water.
5. Isohaline - A line drawn on a map connecting all points of equal salinity in the ocean.
6. Isotherm - A line drawn on a map connecting points having the same temperature at a given time.
7. Isohel - A line drawn on a map connecting points having the same duration of sunshine.
8. Isohume - A line drawn on a map connecting points of equal relative humidity.
9. Isoneph - It is a line representing points of equal amounts of cloud cover.
10. Isopectic - A line drawn on a map connecting points at which ice begins to form at the same time of winter
11. Isotach - A line drawn on a map or chart connecting points of equal wind speed.
12. Isogeotherm - An imaginary line connecting all points within the earth having the same mean temperature.