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Certain charts such that the topographic charts indicate constant securities such as altitude, those are often represented, with other characteristics, according to the scale of the chart, in the form of curves of equal securities. The curves of equal securities on a chart or a diagram indicate a constant value such as the temperature, or of precipitations.

The charts of all the scales traditionally were involved and made with the hand, but the recent arrival and the margin of the computers revolutionized the cartography. The majority of the charts of commercial-quality are now made with the software which fall into one from three principal types: CAD, GI, and specialized software of illustration.