Map is a conventional representation (miniature) of the elements (fatures) physical (natural and man-made) of part or all of the earth's surface in the media plane with a certain scale.
The geometric requirements to be met by a map so that it becomes an ideal map is:
1. The distance between the points located on the map should match the original distances in the
earth's surface (with particular attention to the scale factor).
2. Area of an element that is represented on the map should correspond to the actual area (also
taking into account the scale).
3. Angle or direction of a line is represented on the map should correspond to the actual
direction (as in the earth's surface).
4. Form of an element that is represented on the map should correspond to the actual form (also
taking into account the scale factor).
In fact in the field is impossible to describe a map that meets all the criteria above, because the earth's surface is actually curved. Hence, in the projection of a curved surface shape of the earth into a flat field (paper) will be distorted. Therefore there will be criteria are not met.
Priority criteria in the map projection depends on the use of such maps in the field map used for example for Grid planning, then that will be our priority is the ideal criteria 1 and 3, while the campus plan that will map our digitization course criteria 2 and 4 are will take precedence.