In China, renovating old neighborhoods is of great significance for improving community functions, speeding up the modernization of urban infrastructure construction, and enhancing the living environment of old urban areas. It is also a major project concerning people’s livelihood and construction development in China. The state requires that by the end of the 14th “Five-Year Plan” (China’s development strategy for 2021-2025), the task of renovating all the old neighborhoods built before 2000 should be largely completed.
From an article by NavVis.
The renovation of old neighborhoods is no longer just about accommodating buildings to the elderly and installing elevators; the problem also lies in the large scope of buildings, as well as missing or the complete loss of construction data due to the buildings’ old age.
The traditional surveying method hasn’t been able to keep up with the pace of urban construction and renovation. However, with mobile 3D laser scanning and surveying technology, one can quickly and easily obtain the actual status of old neighborhoods and complete the renovation with high efficiency and speed as well as low labor cost.
Project requirements and challenges
Create drawings of the building facades within one and a half months and measure the size of the facade and the amount of material required to add the insulation;
Gather information about the location of water and gas pipes in each household and plan the renovation according to the drawings.
The project covers a total of five neighborhoods in Shijingshan District, Beijing, including hundreds of buildings. Having the residents cooperate during the scan is only one problem to solve; the project team also faces the challenge of needing to scan multiple buildings with various apartment types, planning for residents’ access to their homes, and even the tricky problem of scanning pipes that are wrapped in the walls.
Hardware: NavVis VLX
NavVis VLX is a mobile 3D laser scanner with an industry-leading SLAM algorithm that can provide a global accuracy of 6mm in a testing area of 500 sq meters. It allows fast and comprehensive data capture of space and objects. With its real-time view, high accuracy, and digitization features, it provides data support for drafting, elevation measurement, and accurate accounting.
Software: NavVis IVION
After importing the data scanned by NavVis VLX, NavVis IVION can display panoramic images and 2D maps, enabling the users to have a clear overview of the data of the scanned area. Point cloud data can also be imported into other mapping software to help create drawings, saving the need to repeatedly check building information onsite, therefore improving work efficiency.
Key steps in project implementation:
There are two main aspects: data capture onsite and data processing.
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