CN1731475A

CN1731475A - Method for realizing dynamic point ground feature annotation of GIS

Info

Publication number: CN1731475A
Application number: CN 200510018873
Authority: CN
Inventors: 周训飞; 吴玲琦; 章文涛; 邓先礼; 许诺菲
Original assignee: Wuhan Hongxin Telecommunication Technologies Co Ltd
Current assignee: Wuhan Hongxin Telecommunication Technologies Co Ltd
Priority date: 2005-06-08
Filing date: 2005-06-08
Publication date: 2006-02-08

Abstract

The invention relates to a method for achieving geography information system object dynamic labeling. The object labeling location can be dynamically adjusted by the real condition; it dose quoting before labeling the object, if the object picture is inside the map window and the labeling content is outside the map window, the system can automatically find out a location inside the window around the object so as to display the labeling inside the map window, if the object labeling location covers the front object picture or the object labeling, the system can automatically find out a vacancy location inside the window around the object so as to undertake the object labeling do not cover the front object picture or the object labeling.

Description

The dynamic point ground feature annotation of GIS implementation method

Technical field

The present invention relates to the implementation method of Geographic Information System mid point atural object dynamic annotation.

Background technology

In Geographic Information System, traditional mark technology all is static: markup information is fixed with respect to the position that is marked atural object.Mainly there is the problem of two aspects in this technology:

1, when being marked atural object and being in map sheet or screen border, mark can occur and can not show or show incomplete situation;

2, when the many and graphic presentation ratio of the atural object number of map is smaller, can occur covering, mark the phenomenon that covers atural object mutually between the mark of atural object, can cause entirely scheming fuzzy unclear like this.This problem can show by the map content layering and relax, but more still above problem can occur when the atural object number of same figure layer.

In the atural object mark of electronic chart, the mark of some atural object has accounted for the overwhelming majority of whole map label, solve two top problems, must solve the mark problem of an atural object.

Summary of the invention

The objective of the invention is provides a kind of implementation method of dynamic point ground feature annotation of GIS in order to overcome the problem and shortage of above-mentioned existence, has solved mark effectively and has shown phenomenon incomplete and that cover mutually.

Some atural object labeling position among the present invention is dynamically adjusted according to actual conditions with respect to the position of an atural object, before marking, an atural object judges earlier, as fruit dot line map shape within the map window and marked content outside map window, system will be within window, automatically seek securing a position around the some atural object and make complete being presented among the map window of this mark, the atural object figure or the atural object mark of front have been covered as the position of fruit dot atural object mark, system also can be within window, automatically seek the position of a vacancy around the some atural object, guarantee that the atural object mark can not cover the some atural object figure and the mark of front.

Geographic Information System is sought some atural object annotation around map window and some atural object concrete grammar is: make a rectangle in the place of the some atural object that will show, and eight labeling positions are set around the rectangle, and the central point of definite eight labeling positions, determine the priority of eight labeling positions, be respectively 1-8, in the time will showing the mark of this point, at first judge the highest mark rectangle of priority level whether with other some mark rectangle intersection, if intersect, same judgement is carried out in the position that then skips to next priority level, till the annotation rectangle is got along well any other annotation rectangle intersection, if still can not find disjoint rectangle behind eight positions of having circulated then do not show the annotation of this atural object.

The present invention has solved mark effectively and has shown phenomenon incomplete and that cover mutually.

Description of drawings

Fig. 1 point atural object annotation display position figure.

Fig. 2 dynamic point ground feature annotation of GIS realization flow figure.

Embodiment

Further specify the present invention below in conjunction with accompanying drawing.

In Fig. 1, around the some atural object rectangle that will show, have eight labeling positions again altogether, need to determine eight mark central points, and calculate mark rectangle as the center, determine priority, be respectively 1-8, when showing the mark of this point, at first judge the highest mark rectangle of priority level whether with other some mark rectangle intersection, also otherwise and other dot pattern rectangle intersections, if intersect, same judgement is carried out in the position that then skips to next priority level, till the annotation rectangle is got along well any other annotation rectangle intersection.Still can not find disjoint rectangle if circulated behind eight positions then do not show the annotation of this atural object.

Fig. 2 has illustrated concrete treatment scheme of the present invention, at first, need in system, can preserve institute's main points ground bit position rectangle, then a have atural object be carried out circular treatment,, this atural object is not handled fully in the screen window outside as the position rectangle of fruit dot atural object; Each is circulated in the window the inside or with eight positions that the some atural object that window intersects is done as shown in Figure 1, calculate current mark rectangle, judge that whether the mark rectangle is fully in the window the inside, if do not exist, carry out circulation next time up to marking rectangle fully in the window the inside, and then judge the mark rectangle whether with any some atural object rectangle, preceding millet cake mark rectangle has crossing situation, if have, carry out circulation next time up to mark rectangle and any some atural object rectangle, preceding millet cake mark rectangle is all non-intersect, preserve mark rectangle position at last, enter next some atural object circular treatment.

By top processing, the labeling position of some atural object can be regulated between eight positions as shown in Figure 1 automatically, if eight position rectangles are all covered by other atural object rectangle and atural object mark rectangle, then the mark of this atural object can be hidden, avoid covering the generation of phenomenon like this, guaranteed the clear and clean and tidy of drawing.

Claims

1, a kind of implementation method of Geographic Information System mid point atural object dynamic annotation, it is characterized in that: the position of some atural object mark is dynamically adjusted according to actual conditions, when marking, an atural object judges earlier, as fruit dot line map shape within the map window and marked content outside map window, system will be within window, automatically seek securing a position around the some atural object and make complete being presented among the map window of this mark, covered the atural object figure or the atural object mark of front as the position of fruit dot atural object mark, system also can be within window, automatically the position of seeking a vacancy around the some atural object marks.

2, implementation method according to described some atural object dynamic annotation of claim 1, it is characterized in that: Geographic Information System is sought some atural object annotation around map window and some atural object concrete grammar is: make a rectangle in the place of the some atural object that will show, and eight labeling positions are set around the rectangle, and the central point of definite eight labeling positions, determine the priority of eight labeling positions, be respectively 1-8, in the time will showing the mark of this point, at first judge the highest mark rectangle of priority level whether with other some mark rectangle intersection, if intersect, same judgement is carried out in the position that then skips to next priority level, till the annotation rectangle is got along well any other annotation rectangle intersection, if still can not find disjoint rectangle behind eight positions of having circulated then do not show the annotation of this atural object.