Earth photos

Relief maps Land relief

Relief maps Land relief

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Land relief maps are the graphic representation of a territory on a plane. They are always oriented towards the geographical north, which is usually located at the top of the map. They are performed proportionally to reality, using scales and contours.

The contours, also called isohipsas, are imaginary curves that connect points on the earth's surface that have the same altitude. As can be seen in the image, the stronger the slope, the closer the contours of each other appear. On the contrary, the smoother the slope, the farther the curves appear. If the curves are represented discontinuously, they indicate water courses in valleys and ravines. Contours provide a fairly accurate picture of the Earth's relief.

The scale is the relationship between the actual surface and the map size. This relationship is expressed as a quotient or fraction. For example, a 1: 25,000 or 1 / 25,000 scale means that one centimeter on the map equals 25,000 centimeters or 250 meters on a real scale.

The land relief can also be indicated on a map by using bounded points or by the shading method. Shading can be done in combination with hypsometric inks, which is the application of different colors to areas of different heights; with contours or with both indications.

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Shapes of the reliefMariana Trench
Album: Photos of the Earth and the Moon Gallery: The land relief