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HK’s 3D Mapping Tech Pushing Smart City Goals

Hong Kong 3D Mapping Technology
Image Credits: HKSAR Government, Press Release

Hongkongers will probably have seen a distinctive white car, fitted with advanced imaging and sensory gadgetry, making its way around the city, creating the next generation of Hong Kong maps.

As it travels up and down the city’s streets, the vehicle records the three-dimensional shapes of buildings ranging from the iconic Convention & Exhibition Centre to the Customs Headquarters Building, and even primary school campuses.

 3D Mapping Vehicle
The 3D mapping vehicle making its journey through HK.
Source: HKSAR Government, Press Release.

The vehicle, dubbed the Mobile Mapping System, is one of the latest technologies used by the Lands Department to survey the city.

Five pieces of equipment work in concert to collect detailed information for the 3D City Map – a core component of the digital infrastructure underpinning Hong Kong’s smart city development.

A high-resolution camera on top of the vehicle captures 360-degree images and a 3D laser scanner collects spatial measurements.

An inertial navigation system and a global navigation satellite system receiver provide precise positioning.

The Assistant Land Surveyor of the Lands Department stated that said one of the biggest advantages of this system is its ability to quickly and efficiently acquire data, which can be used to enrich 3D models and enhance existing maps.

Using the technology, the department can enhance the attributed information of its basic map. For example, the lamppost number, the building name or the street number.

Drones are also used to map the city, she added. However, air surveying may not be suitable for collecting data from ground level. This is where the Mobile Mapping System vehicle comes into play.

Better Data

  • The 3D City Map is part of the 3D Digital Map Development, which aims to contribute to an innovative, sustainable and smart Hong Kong.
  • Compared with traditional maps, the 3D City Map can provide more accurate and abundantly better spatial data.
  • The map will cover the entire city by 2023, serving as a handy tool for analysis and planning, according to the Lands Department’s Land Surveyor.
  • He stated that based on the 3D digital map, we can develop various kinds of applications such as land administration, environmental assessment, town planning and also transport and engineering studies.
  • The latest transport infrastructures such as the Hong Kong-Zhuhai-Macao Bridge, the Central-Wan Chai Bypass and the Heung Yuen Wai Highway have also been scanned.
  • In the next stage of the 3D Digital Map Development, the department will create the 3D Indoor Map. As a start, data from 150 buildings in Kowloon East will be collected first before extending to other buildings in the city.
  • The last stage 3D models of objects such as trees and lampposts for city modelling will be produced.
  • According to an earlier report, Hong Kong’s 3D-mapping system has allowed Hong Kong authorities to plan and visualise the dense urban environment in a faster and easier way.
  • The tool caters to the needs of a greying population amid rising demand for urban redevelopment. Before the roll-out of the system, planners had to spend days on different platforms and software generating assessments for a multitude of urban environmental issues.
  • Another advantage of the system is that it acts as a one-stop portal, embedded with all kinds of data ranging from population trends to building heights.
  • Such information allows preliminary analyses of how a proposed building will impact the neighbouring environment, with assessments of air ventilation and even whether it would affect the view of neighbouring blocks.

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