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Home   LiDARmag     

Large Scale Mobile Mapping Project in Belgium Combines 360° Images and LiDAR Print E-mail
Written by Lies Steel   
Friday, 27 January 2017

A 1.910Mb PDF of this article as it appeared in the magazine—complete with images—is available by clicking HERE

In January 2017 IMAGE-V, the consortium formed by Teccon and Sweco Belgium, published the last data set of Flanders in 3D LIDAR and high resolution 360° images. This concluded the 2-year project for the Flemish authorities in which the entire road network of Flanders (64.000 kms) was captured not only by 360° images (as had been done before...) but also synchronously by LIDAR point cloud data.

All mobile mapping data of Flanders, the northern region of Belgium, is available free of charge for local and regional authorities. A web-based viewer and software plugins for GISand CAD-systems allow inspections, measurements and inventarisations in a very efficient and accurate way.

Efficient acquisition of high quality data
The image database is a full coverage database of panoramic images and LIDAR data of all Flemish roads. This project covers approximately 64.000 km of drivable roads and almost 13 million photos in two years! In a project of this scale an efficient data acquisition and processing workflow are crucial. IMAGE-V therefore decided to use four Topcon IP-S2 Compact + mobile mapping systems. Each system is installed as a unit on a measuring vehicle. The fixed arrangement ensures a stable setup.

The mobile mapping system features a 360 ° camera and five LIDAR scanners. Every five meters the system takes a photo. The photos are processed into highresolution panoramic images of 8,000 by 4,000 pixels resolution. At the same time the LIDAR data is acquired at a speed of 150,000 points per second. The scan data is used to generate a 3D point cloud.

Why use a 3D point cloud?
The contracting authority only required panoramic images in its tender. Yet IMAGE-V chose to offer a combined solution with 360° images and an accurate 3D point cloud. These inter-calibrated datasets are virtually integrated in the mobile mapping application. This means for the user that he can perform accurate measurements into what actually looks like an image application. The software will perform the underlying translation between the position on the image and the position in the point cloud. The measurement of x, y, z position is done simply with one click on the image. This greatly simplifies the method to define a point / line / area or volume resulting in an application that is easy to use. The combination of both data sets allows making detailed observations, measurements and surveys.

IMAGE-V--a joint venture of mobile mapping experts
This project was executed by IMAGE-V, a joint venture between Teccon and SWECO Belgium. IMAGE-V combines the strengths of engineering company Sweco Belgium and land surveying company Teccon. The two Belgian companies have a high degree of specialization in the field of precise mobile data acquisition. IMAGE-V has no less than 6 fully equipped mobile mapping vehicles available for simultaneous 3D LIDAR and high resolution 360° images data acquisition. The joint venture started operations for this project with four vehicles in the fall of 2014 and recently published the last part of the dataset. In March 2016 the project was awarded the Geospatial Award out of 10 nominated projects.

Easy to use online solution
The database is disclosed through a variety of technological solutions of Orbit GT. The Belgian company Orbit GT delivers state-of-the-art applications for consulting and integration of mobile mapping data: the familiar panoramic images as well as 3D point clouds.

Online mobile mapping application
The secured online application allows for browsing the images at any time via the internet. This browser application combines the 360° images and 3D point cloud. The user-friendly and intuitive online viewer consists of a map and panorama component. The map component gives an overview of the image positions and helps in the search for the right images. The panorama component shows the 360 ° images and allows comparing temporal series, performing detailed measurements and basic feature extraction.

For mobile use, the database can also be accessed with the free `Mobile Mapping Vlaanderen App' for iOS.

Integration
Also available is a SDK to integrate the online functionalities within the users business processes, workflows and environment. The SDK is available for free for all users and allows them to develop plug-ins for their own software environment. Users can also choose to buy one of the ready-made plug-ins available for common GIS or CAD software, such as ArcGIS, QGIS, AutoCAD, ...

Maximum use--from beginners to GIS experts
The Flemish Government has set up this project in such way that a maximum use can be achieved with a minimum of efforts for all government audiences. The online solution has been made available for all partners within the Flemish GDIcommunity. These are predominantly public and semi-public regional and local authorities. However, due to additional privacy restrictions, it is not available for the general public. All government personnel can access the data free of charge and without any restrictions. The users vary from beginners to GIS experts. The Flemish Government has the property rights of the data and can decide to expand the user group.

Protection of privacy
Due to pre-arranged agreements with the commission for the protection of privacy covering all privacy related issues at once, it is not necessary for individual users to get their own privacy permission. The agreement requires the blurring of faces and license plates.

The database is not open to the general public. The main reason is the additional security measures to protect personal privacy. For example: the possibility of blurring houses on demand of the owner, which is necessary in such a case.

Disclosure of historical data
The application archives older mobile mapping data when new data become available. The archived data remains accessible on the application. The user can go back in time and compare different updates.

In 2008-2010 a previous mobile mapping project was executed of the Flemish roads. This dataset consists of 360° images, but no point clouds. The data collected in this previous project was brought online in the application of this project. This allows users to access new and historic data in one go. Faces and license plates in the historic data had to be blurred in order to comply with the same privacy prescriptions as the recent data.

Applications--Users
Mobile mapping data is considered a valuable tool for a more efficient and effective management of the public domain. Applications are found on different levels of government, both local and regional, and within a multitude of domains including but not restricted to asset management, housing, environment, tourism, and public safety.

Local governments reduce the number of site visits, thanks to the recent images in the online viewer. The images also facilitate communication with citizens in a building permit application, notification of a complaint, etc.

The user can not only look at the images, but can also execute measurements and feature extraction. These measurements can be exported and used in a GIS or CAD environment without the use of a plug-in.

The image database is ideal for identifying and inventorising objects in the public space. Think of trees, street furniture, public lighting, road markings and types of paving. With this information the public space manager can visualize information, interpret, compare the results and budgets of management choices and thus make informed decisions. Existing inventories can be checked and updated with the image database.

Flanders Information Agency
Flanders is the northern part of Belgium. The mission of the Flanders Information Agency (Informatie Vlaanderen), a regional governmental institution, is to ensure optimal use of geographical information in Flanders by working out solutions that can be integrated by governmental bodies, companies and the general public.

Conclusion
With the 360 ° image database of Flanders the Flemish government offers many (semi-) governments a free tool for managing public space. Everyone uses it at his own level, ranging from simple consultation by counter staff and board to integrated deployment for the GIS specialist.

Lies Steel is sales engineer at land survey company Teccon since 2012. She is responsible for the sales, marketing and communication at Teccon and IMAGE-V. In 2014 Teccon and Sweco Belgium have set up the joint venture IMAGE-V.

Contact info: THV IMAGE-V, Herkenrodesingel 8B, b3.01, 3500 Hasselt, Belgium E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
Websites: www.image-v.be, www.teccon.be

A 1.910Mb PDF of this article as it appeared in the magazine—complete with images—is available by clicking HERE

 
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