Low-cost versus High-end Systems for Automated 3D Data Acquisition

Modelling an Early Mediaeval Ring Fort in Germany
Topographic mapping is a standard surveying task and the instrument of choice used to be a total station. The use of terrestrial laser scanning has become popular over the past decade or more, but today there is a much wider choice of methods for the acquisition of a digital surface model (DSM). For the 3D recording of an early mediaeval ring fort, the use of three modern systems was investigated: a portable (kinematic) laser scanning system, a static terrestrial laser scanning system (TLS) and a photogrammetric unmanned aerial system (UAS). The systems were compared to each other based on the... (read more)
2017-01-09 12:57:53

Mobile Lidar Systems Today and Tomorrow

The Promising Future of Mobile Mapping and Laser Scanning
Mobile Lidar systems (MLSs) are used with increasing frequency for three-dimensional (3D) mapping applications along various corridors because of their extreme ease in capturing high-resolution 3D topographic data. This article examines the current state of the mobile Lidar system market before looking ahead to the future scope for mobile mapping and laser scanning, including potential challenges that lie ahead. Mobile Lidar systems are frequently used for 3D mapping applications along various corridors because of their extreme ease in capturing comprehensive high-resolution 3D topographic data at normal speeds. An MLS observes a corridor and nearby objects in the form of their... (read more)
2018-07-13 03:12:14

Highest Ever Resolution

A Delta 2 rocket carrying the GeoEye-1 satellite lifted off on Saturday 6th September 2008 at 11.50am from Vandenberg Air Force Base, California. Weighing 1,955kg, the satellite can capture every piece of the Earth up to every two days at approximately 10.30am local time. This interview presents further details and strategic considerations.<P>   Sixth September 2008 must have been a very exciting day - what were your feelings on reaching this milestone? GeoEye first made history in September 1999 with the launch of its sub-metre resolution Ikonos satellite, then the highest-resolution commercial earth-imaging satellite. This title now goes to GeoEye-1.... (read more)
2008-12-10 12:00:00

Unmanned Aerial Vehicles for Glaciological Studies

Airborne Survey of Fountain Glacier’s Terminus Region
In July of 2010, researchers from the Department of Geography at the University of Calgary used a lightweight unmanned aerial vehicle (UAV) to carry out an airborne survey of the terminus region of Fountain Glacier on Bylot Island, in the Canadian Arctic. The survey comprised 16 flight lines, with a total of 148 photos being obtained from an average height of 300m above the glacier surface. A detailed surface model of the glacier and a 10cm resolution orthophoto were produced. The results from this survey will be used to quantify future changes in glacier mass and changes to surface flow... (read more)
2010-10-04 04:23:12

Bringing Colour to Point Clouds

Until now, most commercially available airborne Lidar systems have operated on one single wavelength, reflecting energy from a pulse which is then used for classification or visualisation. New developments have produced the first multispectral Lidar systems which scan using laser pulses in a number of different wavelengths. Multispectral Lidar data contains valuable information about the objects scanned. The fast-moving advancements in this field are likely to represent the next technological leap in Lidar systems. (By Sam Fleming, Iain Woodhouse and Antoine Cottin) Lidar systems have fundamentally changed the world of mapping and surveying. Airborne systems can cover large areas and... (read more)
2015-04-03 09:51:58

Mapping the Seafloor with Remote Sensing and Satellite Imagery

An Analysis of the Techniques and Benefits of These Methods
70% of the Earth is covered by water, but so far just 7% of it has been surveyed (Mars, Venus and the Moon are better surveyed). Hydrography as a science has changed dramatically since the first measurements were made by Alexander Dalrymple and James Cook with lead lines and sextants. Singlebeam echosounders were invented in the 1920s – a technology still used today for mapping the seafloor. This method of using echosounders can produce very high-resolution bathymetric data but the high operational costs and the slow working process make it economically unsuitable for covering large areas. However, with the ongoing expenses of... (read more)
2018-06-19 09:23:54

Trimble European Headquarters

Role of Positioning in Improving Work Processes
Founded in 1978 in Sunnyvale, California, US, Trimble provides positioning solutions that enable professionals in many areas to improve their work processes. As well as utilising positioning technologies such as GPS, laser and optics, solutions include software content and wireless technologies to tightly couple the field and back office. The company has a worldwide presence, with more than 3,400 employees in over eighteen countries. Trimble’s European headquarters are in Raunheim, Germany. This article results from a visit to Trimble's European headquarters and kicks off a new monthly column in which one of our editors will report and reflect on a... (read more)
2007-09-19 12:00:00

Mobile Laser Scanning in Venice

Grand Canal in Scan- and Image Data
High measurement rates and centimetre precision point-clouds are state-of-the-art in mobile laser scanning. The introduction of photogram­metric features as next logical step considerably expanded the horizon of potential applications. Digital 3D documentation of Venetian cultural heritage as represented by the Grand Canal has until recently been achieved only for a few individual buildings. Now, in a collaborative project carried out by Universitá IUAV di Venezia and mobile-scanning system VMX-250 manufacturer RIEGL Laser Measurement Systems, the entire Grand Canal area has been registered in time-stamped image and scan data, complete with precise location and position data. The IUAV CIRCE Photogrammetry Lab... (read more)
2011-03-28 03:27:18

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

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
Search Filter