Using 3D Printer Technology to Represent Survey Information

The Art of Bathymetry
Great advancements have been made in three dimensional printing over the last few years and have made an impressionable impact across a variety of industries. 3D printing's versatility can be incorporated into any industry that has some form of three dimensional design. An exciting application is to model point clouds from survey techniques to create three dimensional scaled models for visualisation and communication. This article explores a new medium using 3D printed technology.  (By Andrew Ternes, Port of Melbourne and Dr Daniel Ierodiaconou, Deakin University, Australia) Over the last few years great advancements have been made to all forms of... (read more)
2016-12-15 11:14:53

Crowdsourcing the Reconstruction of Lost Heritage

Rekrei: Recreating the Past
Cultural heritage stands as an important testament to how we perceive the past. Unfortunately its preservation cannot always be assured, due to destruction by human or natural means. In February 2015, a video was released which showed the destruction of artefacts in the Cultural Museum of Mosul, Iraq. A volunteer initiative (initially called ‘Project Mosul’) was launched about a week later with the aim of using crowdsourced images and computer vision to create 3D representations of the destroyed artefacts. Project Mosul was initiated by two PhD students from the University of Murcia in Spain and the University of Stuttgart in... (read more)
2016-11-03 10:07:05

FIG Core Cadastral Domain Model Version 1.0

Distributed Cadastral Systems
FIG 2002 Congress in Washington was presented with a proposal to develop a (shared) Core Cadastral Domain Model, the FIG CCDM. Such a model broadly covers land registration and cadastre and provides an extensible basis for an efficient and effective cadastral system. Development proceeds based on a model-driven architecture, enabling communication among parties using a shared, model implied ontology. After four years of development, the authors here present CCDM Version 1.0. Important considerations during the design process were that the model should cover the most common aspects of cadastral registration all over the world and should follow international ISO and... (read more)
2006-10-23 12:00:00

Mapping Nocturnal Light Pollution

Fusing Hyperspectral Data and Photogrammetric Imagery
Artificial light in urban conglomerates causes nocturnal light pollution. Excessive light radiation is expensive as it wastes energy and not only impacts the environment but may also harm human health. Authorities are showing a growing interest in quantifying the amount of artificial light radiated at ground level in their jurisdiction. A recent project in Spain explored an approach based on fusing simultaneously acquired hyperspectral data and photogrammetric imagery. The resulting luminance maps are accurate and have a high spatial resolution. (By Jordi Corbera, Vicenç Palà and Fernando Pérez-Aragüés, Spain) Nocturnal light pollution is a side effect of industrial civilisation and accounts for... (read more)
2016-05-17 11:40:48

Lidar Quality Assurance

Open-source Software for Processing Lidar Point Clouds
Basic tools for processing Lidar point clouds, which can be extended depending on needs, provide a flexible platform for service providers and users alike. The companies Dielmo 3D, Spain, and Water Management, Australia, have demonstrated how a publicly available open-source application with basic tools for visualising, editing and analysing Lidar point clouds has been extended into a compliant platform that serves diverse applications including mapping of power-line corridors, land uses and riverbeds. By José Carlos Garcia and Rafael Torró (Spain), and David Hine (Australia) The platform, called DielmoOpenLiDAR and released under the GNU GPL licence, enables management and display of... (read more)
2015-06-01 11:39:59

Free Satellite Data Creates New Commercial Applications

Market Growth Requires Effort
The National Satellite Data Portal, managed by the Netherlands Space Office (NSO), is an interesting phenomenon. Despite existing for just five years, its user base and their usage patterns have become so diverse that its level of success is already beyond quantification – and yet the organisation is convinced that the bulk of the market growth still lies ahead. NSO ensures that its customers and partners in The Netherlands can respond to new opportunities in a timely manner. Employing 28 people, the Netherlands Space Office is responsible for the execution of the Dutch space policy. 75% of its annual EUR100... (read more)
2017-12-07 08:23:34

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

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
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