Preparation and creation of digital classifier

Creating process of the digital classifier starts from preparatory works, during execution of which you define view, base scale and assignment of electronic map, for which classifier is created, list of created conventional symbols, their style, list of the characteristics, division onto layers, way of coding and so on.

There are standard classifiers of the topographic information: for maps and plans of scale 1: 500 - 1: 10000 and for maps of scale 1: 25000 - 1: 1000000. These classifiers can be used as a base at definition of objects structure, image of conventional symbols appropriate to them, way of objects coding and their characteristics. At creating of digital maps and plans special-purpose (navigation ones, geologic ones, design ones, tourist ones etc.) for identification of species of conventional symbols it is recommended to use appropriate paper maps.

Digital classifiers are stored in RSC format. The technology of creating RSC classifier is described in a file which is in subdirectory of the installed program:

...\Doc\Classifier editor.doc

The following information should be collected as an execution result of preparatory works:

For description of  map layers (segments):

- layer name (up to 32 characters), any unique value;

- key (16 characters), any unique value;

- unique number of layer (from 1 up to 256);

- order (priority) at displaying on the screen, plotter etc. (from 0 up to 255 - first layer will be covered by subsequent layers).

For description of map objects:

- object name (up to 32 characters);

- key (up to 32 characters), any unique value;

- classification code of the object (11 signs);

- type of localization (line, polygon, point, title, vector, mixed);

- layer number;

- digitizing direction ;

- scalable (dependence of the object's image from a scale);

- visibility boundaries of object (in a scale range);

- list of the mandatory semantic characteristics;

- list of the optional semantic characteristics;

- list of the characteristics, value of which one influences onto style of the object at its displaying, and ranges of values giving one style;

- samples of conventional symbols, appropriate to the object.

For description of semantic characteristics:

- semantics name (up to 32 characters);

- key (up to 16 characters);

- classification code of the characteristic (from 1 up to 65535);

- type of the value (character, numeric, code from  classifier of values and so on);

- unit of measurement (7 characters);

- minimum, maximum and default values of the characteristic - common for all objects;

- tick of characteristic's repetition (if characteristic can have some values for one object).

For description of the classifier of semantic characteristics values:

- classification code of the characteristic (from 1 up to 65535);

- classification code of the characteristic's value (from 1 up to 65535);

- value of characteristic (up to 32 characters).

For the description of palette:

- color;

- palettes name.

For description of used fonts:

- fonts name;

- codepages.