1. All attributes of navigation related elements:

　　1) The attributes of each element are complete, as shown below:

　　road:

　　Road name, road function, road material, road number, lane, road width, grade, road attribute and other comprehensive attributes.

　　Road facilities and traffic regulation information:

　　, speed limit, deceleration, speed measurement, height limit, weight limit, prohibition, priority and other very comprehensive information.

　　2) Navigation specific properties.

　　Strict road grade network plays a great role in navigation, including the correctness and rationality of planning.

　　2. The relationship is complex.

　　1) The relationship between roads and points of interest;

　　For example, the point is on the left or right of the road.

　　The exit between a building and the building is dependent on the road.

　　2) The relationship between roads and intersections;

　　Complex intersection and simple intersection.

　　Each road section in a complex intersection has a combination relationship.

　　3) There is a certain relationship between the intersection type of the road direction board and the road.

　　FAQ: What is the navigation data format?

　　Answer: There are three levels: parent database format, exchange format and storage format. The format is very important for the realization of navigation function.

　　Parent database format: It is a format for direct editing and storage of navigation data. It is mainly convenient for editing and saving, such as TAB format.

　　Exchange format: It is a format that can be converted to various application navigation data. Generally, it is an open format to facilitate conversion applications. (e.g. GDF format)

　　Storage format: originally refers to the format of data stored in the computer, but in navigation, the storage format generally refers to the navigation application format. (e.g. KIWI format)

　　FAQ: What is a map and what is a national basic topographic map?

　　Answer: The traditional concept map is a map that selectively shrinks the natural and social phenomena on the surface of the earth on the plane drawing with the prescribed schema symbols and colors according to certain mathematical rules. Such as ordinary maps, thematic maps, various scale topographic maps, image maps, three-dimensional maps, etc. Modern maps have emerged with new varieties such as micro maps, digital maps, electronic maps and holographic photos.

　　The national basic topographic map is the national basic scale topographic map, referred to as the national basic map. It is a topographic map that is mapped or compiled according to the unified surveying specification, schema and scale series issued by the state. It is the basic map for national economic construction, national defense construction and military operations, and also the basis for preparing other maps. The scale series of topographic maps in various countries are different. China stipulates that seven kinds of topographic maps with scales of 1:10000, 1:25000, 1:50000, 1:100000, 1:200000 (now 1:250000), 1:500000, and 1:1000000 are national basic scale topographic maps. Its measurement accuracy and mapping quantity and quality is one of the important indicators to measure the development level of surveying and mapping science and technology in a country.

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