Different Levels of Digital Twin: L1-L5 发布于2022-05-23

Integrating elements of visual reality, geographic information, physical simulation, and free interaction, 51WORLD created AES (All Element Scene) in 2018, which has accelerated the digitalization of many industries with digital twin technology. The company also classified the restorations of the physical world, according to their visual accuracies, into five levels from L1 to L5, a standard widely adopted in grading digital twin scenes.


▲All Element Scene at 51WORLD EC3 Conference

51WORLD's R&D as well as applications have been greatly improved after years of toiling in the digital twin industry.

Today, 51WORLD once again upgraded its AES : including L1 to L5, and proposed five specific application stages from W1 to W5 for the first time. As always, 51WORLD keeps the industrial demands in mind and exploits its years of experimentation in the industry. Integrated with elements such as multi-source data, physical parameters, and texture accuracy, the enterprise came up with a new scenario grading standard, offering a more refined and more reliable base for digital twin. 

01 Everything is based on data-a link between virtual and real world. 

The real world is made up of a collection of natural elements such as mountains, rivers and trees, as well as an all-encompassing combination of things created by human beings such as buildings, roads and vehicles. However, in the virtual world, everything is about data, and data is everything. One must be sure about one key question before replicating the real world with AES: what is AES?

AES is the digital expression of everything in the world. Although it is composed of virtual data, it can express the hyper realistic world. Simply put, it presents everything in the physical world into the virtual world, and the degrees of restored accuracy are classified into L1-L5, namely city-level L1, regional-level L2, scene-level L3, component-level L4, part-level L5. So, what capabilities does AES have? How can it replicate the real world?

Since it is a "replica", all data are from the real world. Based on its multi-source data compatibility, AES can access and process data from GIS, OSGB, DOM / DEM, BIM, CAD and so on. All physical elements from the real world, such as terrain, buildings, roads, and waters, can be dynamically adjusted by AES, to reconstruct everything in the virtual world.

The first and foremost capability of a digital twin scene is to gather and manage all the elements in the real physical world with colossal data and super-efficient dynamic loading, as well as to provide an interactive operating system through real-time rendering, thus generating a dynamic virtual world that is no different from the real one.

This ability to construct fully simulated 3D dynamic scenes consists of the following eight basic capabilities:

· Automated generation based on DOM and GIS data: AI algorithms can automatically generate urban scenes from DOM and GIS data.

· Reconstruction and generation based on OSGB data: Computer semantic recognition algorithm can automatically lightweight reconstruct based on oblique photography / lidar scanning,

· Automated generation based on BIM data: Automated transformation and generation based on BIM models, while retaining the catalogs and attributes of all components and parts

· Procedural generation of specific scenes: Rapid generation of specific scenes based on procedural algorithms, such as transmission stations and power grids

· HD map-based generation: Generation of high-precision road scenes based on the reconstruction of point cloud models of HD map

· Construction based on massive digital asset library: Rapidly build scenes based on matching the features from massive digital asset library

· Reconstruction and generation based on photo topology: 3D topology reconstruction and generation model based on real photos

· Rapid construction based on PaaS platform: Secondary editing of scenes based on PaaS platform.

02 Five Levels to Accurately Restore the Required Scenes

AES can be divided into five levels, according to the different needs from macro to micro, with the higher level indicating a higher degree of visual, geographical and physical accuracy.

1. City level

The primary city-level simulated scenes, based on GIS data, are mainly used to restore large-scale pictures such as the topography, mountains, lakes and urban layouts. The coordinate accuracy is within 5 meters, and large-scale scenes of tens of thousands of square kilometers can be restored.

2. Regional level

The intermediate regional-level simulated scenes can restore urban buildings, road information, traffic flow, and green plants in a more detailed way than the city-level scenes. The coordinate accuracy is within 5 meters, and it can restore large-scale scenes of thousands of square kilometers.

3. Scene level

As the most commonly applied scenes at current stage, the L3 simulated scenes can truthfully restore building details, dynamic traffic flows, and even the shades of light and shadow through data of GIS and satellite remote sensing. The coordinate accuracy is within one meter, which can restore medium-sized scenes of hundreds of square kilometers.

4. Component level

The super simulation scene, with a coordinate accuracy to the level of centimeter, can restore the centimeter details of road markings, traffic lights, vehicles and pedestrians in the city. It can be employed to construct small street scenes within one square kilometer.

5. Part level

This level of simulation can be called the real all-element simulation, in which people couldn’t tell the virtual from the real even when close-ups. With a more accurate restoration effect, even the textures of flowers and trees, and the shades of real-time lighting can be fully synchronized with those in the real world, which can be used to dynamically drive twin device model components with real-time data.

03 Technical Capabilities Highlight Through Actual Applications

What are the application scenarios of AES L1-15?

51WORLD divides the applications of AES into five stages: W1 visualization, W2 data fusion, W3 data-driven, W4 simulation, and W5 intelligent decision-making. After years of technical trials and practical applications, 51WORLD has successfully implemented use cases in each stage according to different requirements.

We will elaborate the advantages of W1-W5 applications one by one with specific cases.

1. Visualization

High-quality 3D scene can be generated with AES through real-time rendering, which can lend the users a sense of reality with realistic scenes. A wide range of applications can be categorized into this stage, including those in the metaverse scene, such as annual corporate party, meetings, interviews, etc. 

2. Data Fusion

Data fusion perfectly meets the demands of government and enterprise users, as they can converge and present a variety of data in a unified spatio-temporal model. These applications provide operators with quick and effective managing skills, which help to administer the city or park in one scene.

3. Data-driven

At this stage, the AES can turn static into dynamic, which can keep the virtual world in sync with the real one. For example, in a smart traffic scenario, the real-time changes of the traffic flow need to be dynamically synchronized in the digital twin scene, to achieve “what you see is what you get” for all elements.

4. Simulation

At this stage, AES can accurately simulate the movement of objects in the real world, and even predict the changing tendencies. Simulation is widely used in scenarios of smart factories, smart ports, and smart subway to optimize operations.

5.Intelligent Decision-making

 Intelligent decision-making is mostly applied in autonomous driving simulation tests, which can train AI on the basis of simulated environments and colossal case library. Powerful data analysis makes it possible to predict the potential trends in the physical world when circumstances change in a simulated scenario, so as to avoid risks in the real world, thus making it more efficient, safe and better.

The formulation of AES data and standards has laid the foundation for building a real and complete digital twin world, and provided the underlying technical support for 51WORLD’s vision of cloning the earth. Be it a high-precision rendering scene or a large-scale global landscape, the ultra-efficient dynamic loading technology and ultra-large-scale data access capabilities allow users to embark on a free journey of going deeper and higher.


In the future, 51WORLD will continue to hone its AES and deliver effective digital twin applications with ecological partners, to facilitate the digital transformation of the government and enterprises, accelerating the development of the digital economy and contributing to building a digital China.






Wechat Scan to follow 51VR