Method and device for loading electronic map data

Abstract

The invention discloses an electronic map data loading method and device. According to the method, data cache is carried out on interest points to divide the range of a map accessed by a user into a plurality of blank section base maps with transparent backgrounds; in response to the coordinate range of each section base map and the coordination data information of the longitudes and latitudes of the interest points in the cached data, the positions of icons corresponding to the data in the section base maps are determined and then plotted into the section base maps, and then the current section base map with icon plotted is overlapped with a background map layer to realize the map revealing effect of a large data volume of interest points. Compared with the prior art, the method and device disclosed in the invention have the advantages of improving the data loading order and loading efficiency of the large data volume of interest points of the electronic map, and improving the phenomena of relatively long client waiting time and white screen.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for loading electronic map data. Background technique [0002] In the field of electronic maps, POI (Point of Interest) is the most basic and the most concerned type of information. A POI can be a house, a restaurant, a school, a bank, etc. with us Public places or institutions, buildings, etc. that are closely related to life; in the field of security, the installation location of the camera is also the information we are most concerned about. Data can also provide a basis for emergency command decision-making. In the context of the rapid development of Internet technology, the in-depth application of visualization technology such as electronic map in the field of security is also increasing, followed by a large number of points of interest that need to be displayed on the map, ranging from 1,000 to 10,000, One hundred thousand, or even one million l...

AI Technical Summary

Problems solved by technology

[0003] However, the existing three technical solutions all have certain deficiencies. For example, the first image annotation point display solution, because each marker point occupies a certain amount of memory in the browser, with the order of POI objects to be displayed Growth, from tens, hundreds, thousands to tens of thousands or even hundreds of thousands, the total size of the browser memory occupied by these marker points also soars with the order of magnitude growth. Since the memory occupied by the browser is limited, when When the number of marker points reaches a certain number, the map dragging will be very stuck due to excessive memory occupation, and other operations on the map will be quite slow and even directly cause the browser to crash; the second approach is to approximate the display scheme by point aggregation. The solution is only suitable for the general distribution of macro display points, and cannot meet the requirements of the public security department for the real location of videos and other points of interest and real-time video viewing requirements. Moreover, once the amount of data increases to 100,000 levels, the number of aggregated points will also decrease. It will cause the map to freeze; the third way is to use the client to load the background layer service. When a large amount of data needs to be loaded, the server generates and plots the layer slowly and takes a lot of time. When the client keeps moving When the map is located, it will keep requesting services from the server. At this time, the client will have a white screen phenomenon. It will take a while for the map to appear, and the map output efficiency is relatively poor.

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