Vector map

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A digital vector map contains metadata (passport data) of the digital map and data of map objects. A map object can correspond to a real object on the ground (e.g., a bridge, river, building), a group of objects (e.g., a block - a group of houses), or a part of an object. An area of complex configuration on the ground can be divided into several map objects, for example: the porch of a building, individual buildings. Some map objects have no correspondence: explanatory labels, horizontals, kilometer grid, and the like.

 

A digital map can contain up to 65,535 types of objects, which can be grouped into 255 layers and have up to 65,535 types of characteristics. One map sheet can contain up to 2 billion objects. A multi-sheet map can contain hundreds of thousands of nomenclature sheets. 

Passport data is stored in a MAP or SIT passport file, containing a description of the coordinate system parameters of the digital vector map, a conventional name, scale, coordinates of the map sheet dimensions, the name of the RSC digital classifier file, and other vector map metadata.

 

Individual vector map objects can be logically grouped by layers, localization characteristics, and user-defined features. This forms a hierarchical structure for data representation used in solving various applied tasks. Descriptions of vector map object types, semantic characteristics, layers in which objects are grouped, conventional symbols used in creating a digital vector map on graphic devices are stored in the digital classifier of the digital vector map.

 

To overlay user-specific information on the map and solve various applied tasks, the content of the digital classifier can be significantly expanded using the classifier editor program. The format description of the RSC digital classifier is provided in document ПАРБ.00046-06 99 05 Форматы и спецификации данных. Формат классификатора RSC.

 

The MAP format is designed for storing and processing a digital vector map divided into nomenclature sheets according to the selected layout in the "Panorama" Geoinformation System (GIS "Panorama x64") PARB.00046-06. Each map sheet has a frame delineating the sheet area and nomenclature identifying the sheet area and its scale. All sheets have the same coordinate system and scale. The GIS allows displaying a work area consisting of multiple sheets as a single entity, facilitating the solution of applied tasks over large areas. 

Individual sheets in the work area can be updated and edited at any time without the need for additional actions on other sheets in the work area.

 

The SIT format is designed for storing and processing a digital vector map over an arbitrary territory without division into nomenclature sheets.

Descriptions of the MAP and SIT vector map formats are provided in document ПАРБ.00046-06 Форматы и спецификации данных. Форматы векторных карт MAP, SIT.

 

The main data about map objects are stored in the following files:

— HDR / SHD: mandatory reference data file (indexes for quick object search — for multi-sheet MAP, SHD — for SIT maps);

— DAT / SDA: mandatory metric file (object coordinates, DAT — for multi—sheet MAP, SDA — for SIT maps);

— SEM / SSE: semantics file (object characteristics, SEM — for multi—sheet MAP, SSE — for SIT maps);

— GRA / SGR: graphics data file (conventional symbols of graphic objects, GRA — for multi—sheet MAP, SGR — for SIT maps).

 

The sizes of metric, semantic, and graphics files can be up to 64 GB, and the size of reference data files can be up to 96 GB.

 

When working with the map, the following service files may be created:

— SOL: file of the map sheet object tree (lists of objects by clusters — created and updated automatically, significantly speeds up the display of large map sections);

— SI2: file of the object recording order by display weights (table of extreme numbers of objects of different types — created and updated automatically, ensures correct sequence of object display during editing without sorting);

— TAC: map transaction log (list of editing operations — created and updated automatically, provides accounting of performed operations and their cancellation);

— TACX: map transaction index log (list of editing operation indexes — created and updated automatically, enables fast search of performed operations);

— VCLX: file of map object search and display condition lists (created and updated automatically, provides management of display composition and object search on the map);

— OBX: file of named lists of map objects (created and updated automatically, enables overlay and other operations on object lists, report generation, management of object display and search on the map);

— LOG: program operation protocol file and diagnostic log (created and updated automatically, provides analysis of program execution process in case of failures).

 

Special vector map formats can be generated using the Map Sorting procedure.

 

The SITX vector map storage is a digital vector map of terrain, all data of which are stored in one file. Multi—sheet MAP format vector maps and user maps in SIT and SITX formats can be packed into one file with data compression.

A packed multi-sheet map has the extension MAPZ, a packed user map has the extension SITZ.

 

Formats SITX, SITZ, MAPZ can be converted back to the original SIT, SITX, or MAP formats by sorting. Packed maps retain metric accuracy in centimeters during reverse conversion.