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 Point Cloud Segmentation

A Novel Framework for Processing Terrestrial Lidar Data
Terrestrial Lidar data has great potential to produce measurements for as-built building information modelling (BIM). Unfortunately, processing hundreds of millions of points, often contaminated by substantial noise, can be tedious and time-consuming. Normal variation analysis (Norvana) segmentation is an automatic method that can segment large terrestrial Lidar point clouds containing hundreds of millions of points within minutes. Thanks to the high speed, point density and accuracy of modern terrestrial laser scanning (TLS), as-built BIM can be conducted with a high level of detail. But TLS captures not only useful geometric information but also unwanted objects, such as people, animals or... (read more)
2019-05-10 02:00:42

European Lidar Mapping Forum

The ELMF team are taking the show to Salzburg, Austria from 29th to 30th November 2011. In four weeks time, since the launch of the second event, old and new exhibitors are taking stands with 60% of the floor plan already allocated. The organisers are also enjoying a very positive response to the Call for Papers that was announced recently with many abstracts already submitted. The deadline for online submission is 25th July 2011. The ELMF conference is a platform on which to launch the latest concepts from commercial or academic research, leading-edge innovations in technologies, improved operating practices, reports... (read more)
2011-06-30 02:39:04

Airborne Lidar Scanners

Status and Developments
The first commercial airborne Lidar systems appeared on the market in the mid-1990s. This active remote-sensing technology rapidly evolved to become the laser scanners which can today emit 400,000 pulses per second and record the full waveform of the backscattered signal. Soon they will be even able to record half a billion full waveforms per second. In tandem with the new product survey on airborne Lidar sensors (see our website), the author here gives an overview of status and developments, particularly focusing on beam divergence, multiple pulses in air and full waveform recording, and associated opportunities for existing and new... (read more)
2011-02-03 05:10:57

Lidar-driven Innovation

The first laser was built in 1960 by Maiman, two years after Miller and LaFlamme introduced the digital terrain model (DTM) in the context of civil engineering purposes in 1958. Probably, none of them thought that by around 1995 this would solve a geomatics problem that had existed since the arrival of aerial photogrammetry: capturing terrain elevation in wooded areas. While that also required precise navigation based on GNSS and inertial systems, it was the multi-target capability of pulsed Lidar the showed unprecedented detail below the canopy. This technique has also revolutionised other fields in industry, administration and science, such... (read more)
2016-07-11 09:26:40

DragonEye Lidar System

DragonEye is AHAB\'s new Airborne Topographic LIDAR system. By offering a pulse repetition frequency of above 300 kHz, real time digital signal processing of waveform, multiple pulses in the air, and unlimited number of range captures per pulse, DragonEye represents the next generation Airborne LIDAR systems.   In addition the small size and low power consumption assures easy integration in various platforms. The system mainly consists of two collecting chains; one laser range finder for land (topographic) and a camera collecting images. The laser range finders emits pulses and measure the time distance from output pulse to return pulse in... (read more)
2008-09-30 12:30:42

International Lidar Mapping Forum

Rapidly Increasing Acquisition Capabilities
With over 580 registered delegates from 32 countries, forty international exhibitors and nearly a hundred abstracts submitted, the eighth annual International Lidar Mapping Forum(ILMF) reflected the growing importance of Lidar and was one of the most rewarding ILMF events ever.<P> Lidar manufacturers, service providers and users, including national and state government departments, presented a total of 34 technical papers. Jamie Wilder of Sanborn Map discussed trends in miniaturisation and software-controlled sensors, and recognised the need to establish national standards and control systems for metadata. He also considered threats posed by lower commercial rates and competition from other technologies such as... (read more)
2008-04-11 12:00:00

Capturing Scenes with Lidar

Technology in Focus has on three occasions (February 2005, 2006 and 2007) addressed laser and terrestrial Lidar, also called 3D-laser mapping. The first two articles treated the laser component, and the last was on software processing to extract meaningful object models from point-clouds. This fourth article focuses on precautions required when capturing scenes. Terrestrial Lidar: I know what it is, I know what it does, but how do I capture a scene? Vendors of terrestrial Lidar scanners often proudly present the operation of their instruments in the field as “a piece of cake”. And they are right; it is convenient.... (read more)
2007-07-07 12:00:00

The Evolution of Lidar

Single Photon Lidar Brings Higher Pulse Rates for Airborne Lidar
Current airborne Lidar systems, such as the Leica ALS series, capture one million points per second. Increasing the pulse repetition rate is the best way to achieve dense point clouds at lower costs, as the flying speed can be increased. However, the pulse frequency is constrained by parameters such as energy consumption and eye safety. Single photon Lidar enables a much higher pulse rate to be achieved, since much less energy is needed per pulse. Lidar systems are typically constructed from a number of components: a range-finding system, scanning optics to direct the laser pulses, and a position and orientation... (read more)
2017-02-14 04:25:33

Lidar Technology in India

Dominant Trend at MapWorld Forum 2007
Lidar technology emerged as the dominant trend at Map World Forum 2007, attracting keen interest among stakeholders. While Lidar and aerial photo capture may be enjoying a large and increasing international market, in India no company has been forthcoming with investment for fear of burning its fingers; government policy on aerial data collection has been unclear. However, it seems all lights are now turning green for a private sector eager to conduct aerial survey here. Lidar was allotted a full afternoon at MapWorld Forum 2007, while all major Lidar-sensor manufacturers exhibited products and several Lidar-service companies participated. There were no... (read more)
2007-04-17 12:00:00
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