Quick self-adaptive layout method for map legend

Abstract

The invention discloses a quick self-adaptive layout method for a map legend. The method comprises the following steps: in a thematic map manufacturing process which uses an administrative area as a range, dividing a space area between an administrative area geographic range and a map printing geographic range into four positions comprising a top left corner, a top right corner, a bottom left corner and a bottom right corner, and endowing one weighting coefficient to each position; using an evaluation rectangle with assigned initial size and length-width ratio to circularly judge, evaluate and grade the spatial relation of the divided positions; and after the grading of all the divided positions is finished, ordering the scores and taking the position with maximum score as a best position, later converting an evaluation rectangle coordinate system where the position with the maximum score is positioned, and finally putting the map legend in the converted rectangle. The method makes full use of the efficient processing performance of a computer, reduces man-machine interaction during the manufacture of the thematic map of the administrative area, and greatly improves the manufacturing efficiency of the thematic map of the administrative area. The method has large application prospect in the manufacture of the thematic map by using the administrative area as a base map.

Description

technical field [0001] The invention relates to a method for layout of a map legend in an administrative area thematic map, in particular to a fast adaptive layout method for a map legend. It uses the computer's high-efficiency processing performance and the method of adaptive map legend layout developed to reduce human-computer interaction, and is used to realize the rapid adaptive layout of map legends in the production of administrative area thematic maps. Background technique [0002] The map legend is centered on the ground Figure 1 The description of the content and indicators represented by the various symbols and colors on the corner or side of the map is the symbol on the map that represents geographical things. The map legend is the basic form and method to express the content of the map, the language of the modern map, and the tool for reading and using the map. It is usually arranged at the edge or corner of the map. With the development of cartography, it has ...

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Problems solved by technology

[0003] At present, extensive research has been carried out on map automatic cartography synthesis and intelligent cartography at home and abroad. The research objects are the symbolic expression of thematic maps and map generalization (that is, from large-scale maps to small-scale maps). Among them, the automation of map legends is studied. There are few layout methods. Therefore, in the production of computer thematic maps, although the map legend can be added freely, its position and size often cannot meet the needs of the actual map output. Cartographers need to perform human-computer interaction and manually adjust the position and size of the map legend. adjustment

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