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

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

Monitoring Coastal Erosion with UAV Lidar

Comprehensive Surveying of Coastal Topography
The French Mediterranean coast is a complex natural environment where geology, climate and the sea interact and continuously reshape the landscape. Erosion and the availability of drinking water are two major coastal management issues that necessitate precise monitoring of the morphological changes to the shoreline. UAV Lidar is being used in this region to produce comprehensive topographic surveys with unprecedented productivity and level of detail. Several Lidar surveys are planned over the next two years. Read on for details of the context, technical setup and results of the very first survey which took place in January 2018. In the relatively... (read more)
2018-03-15 11:10:02

Third Training Course in Topography for Young Surveyors

The third International and Professional Training Course for Surveyors that took place in Athens, Greece, from 3rd to 14th October 2011 ended with great success and didactic results for the participants. The course was arranged by the Consiglio Nazionale Geometri e Geometri Laureati in cooperation with the Hellenic Association of Rural and Surveying Engineers and supported by Geoweb. The previous two courses were held in Rome, Italy, in 2006 and 2010.     "Young surveyors are the future of our profession," declared Fausto Savodi, President of the Italian National Council of Surveyors. "A course that is a tribute to the... (read more)
2011-11-22 12:00:00

Intergeo 2007

Knowledge and Action for Planet Earth
2007 marked the thirteenth consecutive annual Intergeo. The venue for this major conference and trade-fair for geodesy, geoinformation and land management, held this year from 24th to 28th September, shifts from year to year, always within the boundaries of Germany. This time the train stopped at Leipzig. The event is organised by HINTE GmbH in association with the German Association of Surveying (DVW), and this year took place in conjunction with the fifty-fifth German Cartographer's Day. The event made clearer than ever that geo-data acquisition is a booming industry. All things considered, including current financial figures, vendors of data acquisition... (read more)
2007-10-02 10:53:43

Three Shows in a Row

The cusp carrying winter into spring saw three interesting geomatics shows across the USA from east to west. Tom Gibson, editor-in-chief of our US sister magazine, Professional Surveyor, visited one after the other and sent us this report.<P>   The Annual Conference and Technology Exhibition of American Congress on Surveying and Mapping (ACSM) took place at Spokane Convention Center in Washington, attended by about 1,550 people, up slightly on last year. More Work As usual the conference featured a slew of workshops. Gavin Schrock discussed GPS Communications by network transportation of RTCM via internet protocol (NTRIP). NTRIP is the most... (read more)
2008-05-20 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

Surveying in the Valley of the Temples

Use of Full-waveform TLS in 3D Modelling of an Unstable Area
Full-waveform terrestrial laser scanning enables high-precision 3D topographic modelling of unstable rock valleys that is valuable for various geomorphological investigations. The area below the archaeological site of Temple of Juno in Agrigento, Sicily, is characterised by the presence of large sections of rock that have fallen down from the upper ridge. In this context, full-waveform laser scanning technology was tested for the production of a highly detailed 3D topographic model at two resolutions (2cm and 20cm) for simulating potential rockfall paths at the site. Along a long ridge outside the city of Agrigento, Sicily, is a UNESCO World Heritage Site,... (read more)
2014-11-03 10:47:25

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

Ortho-imagery: Geometric Accuracy Assessment

Towards Product Specification for Urban Areas
Anomalies such as building-lean result from the processing of traditional orthorectified imagery and this limits its use in urban areas. However, the arrival of digital sensors has meant fully orthorectified products coming onto the market. The authors test the positional accuracy of fully orthorectified imagery for urban areas and suggest a product specification. Orthophoto production used to be mostly limited to medium and small-scale applications, and even in the 1990s this market remained so underdeveloped that line-map restitution from stereo imagery was cheaper than producing large-scale orthophotos. Orthorectification transforms an image from a perspective projection to an orthogonal one; the... (read more)
2005-06-23 12:00:00
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