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.
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