AVS(Autonomous Vehicle Simulation) is a framework for autonomous vehicle simulation. XVIZ is one of the functional modules. In AVS, XVIZ provides a data format for representing data generated by self-driving cars in simulations, including vehicle status, sensor data, road conditions, and more.
The main function of
XVIZ is to provide a standard and extensible data format for describing the data generated by autonomous vehicles in simulations. XVIZ's data format is based on JavaScript Object Notation(JSON). It consists of a series of data streams, each containing a set of time-stamped data. These data streams include:
Metadata: Metadata that describes basic information about the entire data stream, such as vehicle type, sensor type, and so on.
Pose: Vehicle status information, including vehicle position, attitude, speed, etc.
Image: Image data, including images generated by cameras or lidar or point cloud data.
Primitive: Geometric data for vehicles, road signs, traffic signs, etc.
Time series: Time series data, including vehicle sensor data, speed, acceleration, and so on.
XVIZ also provides some useful apis for processing and visualizing data. Some of the commonly used apis include:
Dataflow: Used to send data streams to clients and support real-time updates.
XVIZBuilder: Used to build XVIZ data streams, supporting dynamic data addition.
XVIZProvider: Used to provide XVIZ data streams to clients and support local or remote data access.
XVIZMiddlewareStack: Used to process and transform XVIZ data streams, supporting custom middleware.
Overall, XVIZ provides a very flexible and scalable way to describe the data generated by self-driving cars in simulations, and provides some useful apis that can be used for data processing and visualization. This makes XVIZ a very useful tool for autonomous vehicle simulation, data analysis, and development.
In addition to the basic functionality mentioned above, XVIZ provides many other functional modules and apis. Here are some examples:
1 Time-space indexing: XVIZ provides a quick way to index data in a data stream for retrieval in both temporal and spatial dimensions. This makes it easy for the user to find data of interest, such as the position of the vehicle at a given moment or the change in speed over a given period of time.
2 Dynamic building: XVIZ allows users to dynamically build a data stream at run time, which means that users can add new data to the data stream or modify existing data. This allows the user to simulate more situations and scenarios in the simulation and to control the simulation process flexibly.
3 Visualization: XVIZ provides some useful apis and tools to visualize the XVIZ data flow. For example, XVIZ offers a Web application called Xviz-play that plays XVIZ data streams in real time in the browser and allows you to customize layers, colors, data sources, and more.
4 Extensibility: XVIZ allows users to extend data formats in order to support new data types or data sources. This makes XVIZ more flexible and adaptable to meet a wide variety of application scenarios and requirements.
In addition, XVIZ has several other features and advantages, such as
1 Ease of use: XVIZ's data formats and apis are easy to use and allow easy integration with languages and tools such as Python, JavaScript, ROS, Simulink, and more.
2 Performance: The XVIZ data format is very compact, which can greatly reduce the cost of data transmission and storage. At the same time, XVIZ also supports data streaming and can update data in real time, which meets the requirements of real time application scenarios.
3 Standardization: XVIZ is a standard data format that can be easily integrated with other systems and tools. At the same time, XVIZ is an open standard, and anyone can contribute new extensions or improvements to further increase the value and reach of XVIZ.
4 Reproducibility: XVIZ can help users record and reproduce data generated during simulation, which is important for developing and testing algorithms and systems for autonomous cars.
You can find information about XVIZ in Chinese on the following websites or resources:
Official documents of XVIZ XVIZ official document has Chinese translation, can be in the < a href = "https://xviz.gitee.io/docs/zh_cn/" > https://xviz.gitee.io/docs/zh_cn/ < / a > to find the Chinese version of the document.
Chinese Community forums: XVIZ has some active community forums in China, such as Zhihu, CSDN, cnblogs and so on. You can search these forums for articles and discussions about XVIZ for more Chinese materials and information.
Online tutorials and video tutorials: Some websites and video platforms offer Chinese tutorials and video tutorials on XVIZ, such as Bilibili, Youku, Tencent Video and other platforms.
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