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It is not easy to show heights. Contours can be used but are not so obvious to the inefperienced.

Maps covering large parts of the earth - a continent or equivalent in area - will also suffer from the fact that any projection from the [near] spherical surface of the earth to a 2-d plane must result in some distortion. The most popular, amongst map makers is the Mercator projection and that tends to exaggerate distances as you get nearer the poles of the earth.
The two dimensions depicted are length and width and the objects on the picture are flat. Examples of such pictures are ancient Egyptian wall paintings or images from. Three-dimensional pictures contain yet another dimension: depth. This type is the most realistic one, as the depiction of objects or environments resembles the way we see them through our own eyes. In the maps with 2d hights, elevations, depth of terrains, realtime measurement of object like trees can;t be demonstrated.

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