2.2 Density of graphic information

2.2 Density of graphic information

The density of graphic information on a tactile map is determined by the resolving power of touch.

"By touch, two points can be distinguished as separate if their distance is not less than 2.4 mm. (All distances given below are approximate). The deciding factor must be the legibility of the proof in the technique in which the presentation is to be made, not the size and distances on the flat drawing in the computer. It is important to know that the same drawing will read differently by touch when processed in different techniques.

From this fact, the basic rules for creating tactile graphics arise:

If two or more points, lines, or other shapes are to form a single graphic mark, their distances should be no more than 2.4 mm.

Graphic signs (dots, lines, signatures, textures), representing different content, should be placed at distances of no less than 5 mm. Only where clearly contrasting signs are placed close to each other (e.g. Braille lettering next to a continuous line) can the distance be less than 5 mm, but it must be more than 3 mm."