2017-01-05 08:56:47

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

Airborne Lidar in Rainforest

Towards a UAV-based System for Measuring Canopy Height
At the experimental forest site Paracou in French Guiana, a range of data is being collected to enable the short-term dynamics within the tropical rainforest canopy to be better understood and quantified. Airborne laser scanning (ALS) was used to obtain high spatial resolution data of the 3D canopy structure. The data has been utilised to build a canopy height model and provides valuable information about the foliage density. The sensing system can also be mounted on an unmanned aerial vehicle (UAV). The French Guianian project demonstrates proof of concept for the further application of this technique. By Sam Fleming, Prof... (read more)
2014-09-01 11:42:29

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

Leica Launches Airborne Lidar Line

The ALS70 family of airborne Lidar systems from Leica Geosystems includes the ALS70-CM City Mapper, ALS70-HP High Performance and ALS70-HA High Altitude models, covering the entire range of Lidar mapping applications.     By incorporating Point Density Multiplier technology, Leica was able to develop a Lidar product that offers a 500kHz pulse rate and 200Hz scan rate, for ultra high-point density and control over the point pattern on the ground. ALS70 also incorporates new detection circuitry providing sensitivity to small or low-reflectivity targets. This has proven itself already on power line data acquisition, according to product manager for Airborne Lidar,... (read more)
2011-07-18 04:37:36

Doubling Airborne Lidar Data Acquisition

Leica Geosystems' Point Density Multiplier technology for airborne Lidar allows the use of a single laser and scanning mechanism to provide over double the data collection productivity of previous systems. This technology will be incorporated into Leica Geosystems' ALS series airborne Lidar Systems.   According to Ron Roth, Product Manager for Airborne Lidar at Leica Geosystems' Airborne Sensors Business Unit, the market constantly demands higher productivity from airborne sensing systems to reduce the equipment and labor costs associated with data collection. The measurement rate of 500kHz gives the industry-leading data acquisition productivity that Leica's customers desire, without the complexity of... (read more)
2010-10-05 09:18:11

Wildlife Management Using Airborne Lidar

Finding Murrelet Habitat
The traditional sampling protocol for quantifying potential nesting habitat for murrelet requires an observer to peer up through the tree crown from the forest floor, a task resulting in data of dubious quality. Two-dimensional features of the canopy surface can be quantified using satellite imagery, but the three-dimensional attributes of the inaccessible middle strata of the canopy are the most critical to understanding and mapping the habitat. The development of Lidar as a tool for quantifying forest structure offers great promise of new solutions to existing habitat measurement problems and opens up a new realm of possibilities for exploring wildlife-habitat... (read more)
2016-12-07 10:26:47

Lidar

This issue of GIM is largely devoted to emergent Lidar technology. We have a feature on 3D-visualisation of Lidar data co-authored by new contributing editor Dr Bharat Lohani of IIT Kanpur India, and no fewer than two product surveys, one on Airborne Lidar Systems, the other on Lidar software. Two regular features, Technology in Focus and Company’s View, this month address processing the product of Lidar survey, point-clouds. Lidar is without doubt a most successful data-acquisition technique. As an acronym of Light Detection and Ranging - some prefer to read Lidar as Laser Imaging Detection And Ranging - the term... (read more)
2007-01-19 12:00:00

Airborne I Offers 3D LiDAR Tools

Airborne 1 Corporation (CA, USA) now distributes QT Modeler and QT Reader, two developments from John Hopkins University’s Applied Physics Lab (APL) that enable visualisation of high-resolution 3D LiDAR data. The design is based on enhanced data structures using 3-D chips originally intended for the PC gaming market, and on extensive response from LiDAR professionals. The products do not require underlying CAD or GIS platforms yet can process models of up to 200 million points. Data formats for import/export comprise XYZ (ASCII), XYZI (with Intensity), LAS, GeoTIFF and raster floating point data. Additional features include line-of-sight and view-shed analysis, measuring... (read more)
2005-03-08 12:00:00

Optech Announces Multispectral Airborne Lidar Sensor

Optech has announced the latest addition to its line of airborne laser terrain mappers (ALTM), the Optech Titan. The Canada-based company regards the Optech Titan as the launch of a new era in remote sensing, as the mapper offers the possibility of multispectral active imaging of the environment at day and night, allowing new vertical applications and information extraction capabilities for Lidar. In the past, single or dual-wavelength sensors were developed for specific market verticals and application requirements. Optech states the Titan breaks away from this convention by combining three beams with separate wavelengths, increasing the information content that can be... (read more)
2014-12-01 04:25:27
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