面向数字孪生城市的自然场景构造方法

自然场景内要素种类繁多、结构复杂,在数字孪生城市中还原自然场景具有挑战性。数字孪生城市中的自然场景不仅要使用高逼真的三维模型,还要能表现自然环境中要素的生长过程、结构组成和分布规律,同时满足不同尺度下的场景变换,构造出既符合空间分布规律又具有沉浸式体验的场景。本文从自然场景构造过程的角度分析了场景构造的4个关键技术问题,回顾了目前场景要素建模和场景构造方法,并提出了一种面向数字孪生城市的自然场景构造技术框架。

A natural scene construction method for digital twin cities

The digital twin city seeks to restore the urban scene that is close to the reality and provides immersive experience based on the completeness of the urban entity. Natural scene plays an important role in urban scenes. However, natural scene construction faces many challenges due to its diverse types, complex structure and indeterminate location of the scene components. With the development of digital twin city, natural scene construction requires not only high-quality 3D models of scene components but also their ecological characteristics such as growth processes, structural compositions and distribution rules in the natural environment to cope with scene simulations at different scales. Moreover, these structural-functional models result in an in-depth scene visualization that facilitate both better spatial cognition and immersive experience. This paper identifies the key issues of natural scene construction from the perspective of the scene construction process, reviews the relevant, state-of-art techniques and methods of 3D scene construction, and further proposes a natural scene construction framework for digital twin city.