Capturing Geospatial Data from Vehicle Platforms

Jacobs’ Journey
Jacobs Geomatics provides support and consultancy to the company’s wider design and engineering services. In recent years Jacobs’ UK geomatics team has been involved in increasingly large infrastructure schemes, typically supporting preliminary and detailed design phases of projects. This requires advising on solutions and the subsequent provision of suitable geospatial data. As the projects have grown in scale and complexity, the company has increasingly sought to supplement traditional topographical survey capture techniques with rapid data techniques such as terrestrial laser scanning, aerial photography and Lidar. Over the past three to four years, Jacobs has also become increasingly involved in vehicle-mounted... (read more)
2016-11-18 09:10:37

Laser Scanning Technology Challenged

Shortcomings in Spatial Documentation of Heritage Sites
In this month’s Insider’s View Prof. Heinz Rüther puts some critical points on the shortcomings of laser-scanning technology in the spatial documentation of heritage sites. We invited manufacturers of laser-scanning sensors and software to comment on his challenging observations. Nearly 70% of the companies responded (ten in total) and seven felt qualified to reply: Optech, Riegl, Leica Geosystems, 3rd Tech, Visual Learning Systems, TopoSys and I-SiTE 3D Laser Imaging. We thank all respondents for their time and effort. Critical observations made by Prof. Heinz Rüther include the following. (1) The processing time of laser-scan data can be up to ten... (read more)
2007-02-23 12:00:00

A Visit to...Hewlett Packard Barcelona

Hewlett Packard (HP) celebrates the twentieth anniversary of its Barcelona site this year. The company has a portfolio spanning printing, personal computing, software, services and IT infrastructure, and Barcelona is the nerve centre of its predominant large-format printing activities. On 3rdand 4thApril 2008 the international professional press was invited to look ‘Behind the Scenes’.<P>   "Our workforce in Barcelona consists of more than two thousand people, including employees working in our engineering and support facilities," Francois Martin introduces us to the facility. Since 2006 he has been marketing director for Graphic Arts. As might be expected, nearly 75% of the... (read more)
2008-05-17 12:00:00

Christ the Redeemer Reconstructed in 3D

UAV Deployed in Challenging Conditions to Reconstruct Iconic Statue
The famous statue of Christ the Redeemer in Rio de Janeiro has been reconstructed in 3D using a UAV. Challenging weather conditions and the sheer size of the monument meant that careful planning was required to complete the project and maintain safety. Thousands of pictures were captured around the statue and processed to create a large and accurate point cloud and a textured mesh. (By Lisa Chen and Sonja Betschart, Pix4D, and April Blaylock, Aeryon Labs) Fascinating images of the statue of Christ the Redeemer in Rio de Janeiro, Brazil, were seen around the world during last year’s FIFA World... (read more)
2016-06-29 11:08:28

Earth Observation in Conflict Mitigation

Co-ordinated Mission
The conflicts in Darfur and Chad have led to excessive human-rights violations, including murder, rape and enforced displacement. Millions of civilians have had to leave their homes and hundreds of thousands have died as a result of attacks. The worst years of fighting were 2003 and 2004, but violence is on the increase again. International peacekeeping has not proved effective and access to humanitarian agencies is limited. A powerful tool in support of planning processes for international missions is earth observation (EO) via up-to-date satellite imagery.<P> In early summer 2008, the external relations directorate-general of the European Commission (DG RELEX)... (read more)
2009-06-30 12:00:00

Underground 3D Scanning in Bhutan

Cavity Mapping above Collapsed Tunnel
Surveying cavities in underground excavation projects can be difficult and dangerous. The collapse of a roof inside the main access tunnel at a hydroelectric dam construction site in Bhutan resulted in loss of life and a significant delay in progress. Project participants could not move forward with the tunnel work until they could ascertain the size and condition of the cavity that remained above the caved-in debris blocking the chamber. This article describes how an Indian technology application company deployed a laser scanner specially designed for cavity measurement to accurately determine the volume and dimension of the inaccessible space. In... (read more)
2018-04-26 10:12:47

The Great Standardisation Payoff

GIM international interviews Mark Reichardt
The Open Geospatial Consortium (OGC), established in 1994, develops standards for geospatial and location-based services. From its first approved implementation specification in 1997 and the first interoperability programme testbed in 1999 to today’s broad array of standards and initiatives, the OGC continues its forward momentum. More than 25 standards are now freely available to address challenges identified at the time of the organisation’s founding. But the real measure of OGC’s success is that these standards, collectively forming a reference architecture for interoperability, are being implemented in communities and organisations around the world. We asked OGC president and CEO Mark Reichardt... (read more)
2009-04-02 12:00:00

Airborne Lidar Bathymetry

Mapping Shallow Rivers Under Low-flow Conditions
Although operational for more than twenty years, Airborne Lidar Bathymetry (ALB) has rarely been used in riverine areas. The US Bureau of Reclamation adopted it to study how flow change in the Yakima Rivera affected fish habitat. The authors show that ALB offers accuracy and precision at least as good, if not better than that achieved in typical survey by boat with sonar and GPS. The United States Bureau of Reclamation needed to create an accurate hydraulic model of the Yakima River in Washington State to study how changes in river flow would effect downstream fish habitat. For many years... (read more)
2006-10-23 12:00:00

Lidar Flight Planning

A System with Minimal User Intervention
Airborne Lidar has become a regular technology for acquiring accurate, consistent and dense point clouds. However, the constraints on specifications, available sensors and aerial platforms are still a challenge for Lidar data acquisition. Optimal flight planning is essential. Current practices rely on rules of thumb and trial and error, meaning that optimal solutions are rare. The authors have developed a Lidar flight planning system which does provide an optimal solution at a high level of automation and requiring minimal user intervention. Once acquired, Lidar data should satisfy the specifications on density, overlap, spatial distribution and accuracy. Data clusters and voids... (read more)
2014-02-17 10:39:05

The Current State of the Art in UAS-based Laser Scanning

Airborne Laser Scanning with a UAS
Airborne laser scanning (ALS) offers a range of opportunities for mapping and change detection. However, due to the large costs typically associated with traditional ALS, multi-temporal laser surveys are still rarely studied and applied. Unmanned aerial systems (UASs) offer new ways to perform laser scanning surveys in a more cost-effective way, which opens doors to many new change-detection applications. What are the differences in suitability between the two main types of UAS platforms – fixed-wing systems and rotorcraft – and what is the current state of the art in UAS-compatible laser scanning systems? Read on to find out. (By Antero Kukko, Anttoni... (read more)
2016-06-22 04:21:25
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