Scalability of map objects

The scalability is an ability of objects at blowup of a map to change sizes of a conditional  sign  (line thickness, height of the font etc.).

If the tag of a scalability is not placed for the object, at blowup of a map the sizes of a conditional sign remain constants. At compression of a map the sizes of the sign decrease irrespective of scalability sign.

There are exceptions from this rule. If the tag Not compress is placed in the description of a conditional sign, at decrease of a map the sign does not decrease. If the tag To expand is placed for the vector sign or subscript, the sizes of the sign (height of a subscript) are proportional to distance between two points of the object metric. Accordingly, at scaling a map a size of the sign directly proportional varies.

At increase of a map a size of scalable signs (line thickness, height of the font, the overall dimensions of vector signs) vary with lag from a map scale, if the cartographical way scaling of the image is placed.

The lag of increase  of the object from a map is defined under the formula:

ObjectScale =1 + MapScale/2.

At a drawing way of image scaling the scale of the sign is equal to a map scale.

The tag of a scalability is recommended to apply to the image of real area objects, which size can not be transferred in a map scale (width of a road, size of a building etc.).

For auxiliary objects (line of a kilometer grid, horizontals, current indicators etc.) application of a scalability is not expedient.

The vector signs and subscripts, as a rule, look better if the tag of a scalability is placed.

For improvement of map readership except scaling the boundaries of visibility of objects are applied.