Ideas and Exploration of 3D Real Scene Application Service Capability Building (Excerpt)
Key technologies and methods in the construction of 3D Real Scene
In 3D real scene construction, there are problems such as huge amount of 3D model data, diverse data formats, and inconsistent time spans. How to integrate multi-source, multi-scale, multi-sequential 3D model data with 2D data to achieve integrated 2D and 3D management is a core issue that needs to be solved urgently. SuperMap has built cross-platform distributed management capabilities based on the basic land and space information platform. Through multi-angle, multi-directional, and multi-dimensional data management technology in three dimensions and time series, it combines 2D data, DEM, white models, precision models, BIM, oblique photography, geological bodies, water bodies, pipelines and other data are integrated based on a unified spatial scale to achieve integrated two- and three-dimensional data management.
Traditional visualization technology has problems such as unintuitive loading of large scene data, low efficiency, and poor rendering effects. With the help of a series of data lightweight innovative technologies such as webp, block storage and subdomain technology, model slicing and cache file volumes are compressed through data compression, concurrent requests, rendering optimization and loading strategy improvements, greatly improving rendering efficiency.
Using the webp image format can reduce the size to the greatest extent while ensuring lossless image quality, and different compression methods and pyramid level settings can effectively improve data loading efficiency; the block storage method further manages small tiles into blocks to reduce network request times; subdomain technology can increase the number of concurrent browser network requests. The combined use of multiple technologies solves the problem of dynamic loading and low rendering efficiency of 3D model data, and achieves millisecond-level loading of 3D model data. The loading efficiency is nearly 4 times higher than that of traditional methods.
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On the basis of realizing the dynamic visualization rendering of 2D and 3D data, SuperMap further expands its spatial analysis capability, integrates complex multi-dimensional spatial analysis capabilities, and supports the decision-making of various business applications such as natural resources and smart cities.
Through the visual dynamic arrangement of big data analysis operators and the use of 3D real-scene rendering technology, it provides a general "instant analysis, real-time display" 3D large scene analysis and display capability, mainly including: visual domain analysis that can be used for building line of sight obstruction judgment and communication signal coverage, sunshine analysis that outputs building lighting suitability models in civil engineering, urban planning and landscape analysis, flooding analysis that simulates urban waterlogging and provides a basis for urban disaster warning and construction planning, earthwork analysis in the construction and design fields, fill and excavation analysis for engineering cost estimates and scheme optimization, slope and aspect analysis for arable land quality evaluation, etc.
In order to solve the problems of high-fidelity display of large-scene, full-factor 3D model data and poor rendering performance, SuperMap has studied the fusion simulation technology of game rendering engine and GIS engine, and built a dual-engine visualization mode based on "game rendering + 3D GIS" to effectively improve the realism of large 3D scenes and user experience.
In the future, SuperMap will continue to optimize on the basis of existing practices, continuously promote the construction of a 3D real scene database of natural resources, carry out large-scale data production, fully support software technology innovation, thus contributing to the construction of 3D real scenes in China and beyond.