High-precision map generation system and method based on high-definition ortho-photo map

Abstract

The invention provides a high-precision map generation system and a high-precision map generation method based on a high-definition ortho-photo map. The system comprises an image shooting module, a horizontal laser radar, a GPS (global positioning system) processing module, an inertial navigation module, a rotary encoder, an image and data preprocessing module and a geographical information processing module, wherein the vehicle-mounted image shooting module is used for acquiring a road image; the laser radar is used for scanning a barrier and acquiring geographical information data; the precision of GPS information is optimized; the ortho-photo map of the road image is acquired and then is rotated and sheared to generate corresponding geographical information file operation; a full ortho-photo map sequence and a corresponding geographical information file are combined and spliced to generate a base map of a global map; various types of geographical information data are marked on the base map of the map. According to the method and the system, a high-precision navigation map can be generated, and the data precision can reach centimeter level; the method and the system are extremely high in practical value on an advanced auxiliary driving system and an unmanned vehicle.

Description

technical field [0001] The present invention relates to the field of map surveying and mapping, in particular to a system and method for generating a high-definition map based on a high-definition orthophoto map. Background technique [0002] Maps have become an integral part of the daily travel of vehicles, mainly used for environment viewing and route navigation. However, at present, most common maps can only provide geographic information with road-level accuracy. Drivers or driving systems cannot know the current road lane information and which lane they are in from the map, and the road-related information contained in these maps is limited. It only contains the approximate location information and road shape information of part of the traffic sign information, which has low precision and small amount of information, and cannot fully reflect the characteristics of the road. Common map images use satellite images or aerial images. The image resolution is low, most of wh...

AI Technical Summary

Problems solved by technology

[0004] At present, there are other methods for making high-definition maps, such as using lidar. Lidar collects information with high accuracy and good globality, but the cost is high, the amount of data is large, and the generated image is a reflectance image, which is different from the real scene. The image method is cheap and easy to use

[0005] The Chinese patent with publication number CN103996036A (application number CN201410253818.4) provides a method and device for collecting map data. The type of data that the device can provide is very limited. Although it is not clearly stated in the patent technology, its method Only the approximate position can be given, and the data accuracy is difficult to reach the centimeter level

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