ISPRS on Track for Melbourne

GIM International Interviews Orhan Altan
Orhan Altan is president of ISPRS. He gives us a sneak preview of the four-yearly ISPRS Congress which will be held in Melbourne, Australia, this summer. Seeing the potential for tremendous developments in the sector in the years ahead, Altan calls on governments to resist cutting back on sciences such as photogrammetry and remote sensing which, while still developing, are already very important. Back in 2009, you said that ISPRS should prioritise environmental monitoring and sustainable development. Is that still your standpoint?Yes – it is still my standpoint and also that of the ISPRS. In 2008, we established several working... (read more)
2012-04-25 03:51:51

Automatic Tie-point Extraction

Novel Matching Method for Handling Non-standard Imagery
One of the most complex and time-consuming tasks in the photogrammetric workflow is the extraction of corresponding points in two or more overlapping images. This is the first stage of aerial triangulation and block adjustment aimed at computing the positions of the projection centre and the orientation of each image. Automating the extraction of these so-called ‘tie points’ can be challenging, especially when non-standard approaches such as cameras mounted on UAVs or oblique imagery are used. The authors present a novel matching method able to handle the most challenging imagery. The aim of matching is to identify corresponding points in... (read more)
2012-04-25 04:16:35

Co-seismic Displacement Estimation

Improving Tsunami Early Warning Systems
Geomatics is not primarily aimed at investigating the causes and physical phenomena related to earthquake events. It has, however, over recent years established a fundamental role in monitoring and describing changes to the Earth’s surface. In particular, this article describes the state of the art of the GPS contribution to Seismology, and presents an innovative methodology, VADASE, that enables accurate estimation of co-seismic displacement waveforms in real time using standard broadcast products and high-rate carrier-phase observations collected by a unique GPS receiver. This represents a potential enhancement to GPS Seismology and an effective support for tsunami early warning systems. The... (read more)
2011-04-27 02:59:42

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

Mobile Mapping Trends and Insights

Data Analysis by Geomares
Mobile mapping technology is on the rise worldwide. Industry specialist Geomares – publisher of 'GIM International' among other things – has analysed the user data and behaviour of thousands of members of the global geospatial community. This article presents the findings from that analysis, identifying the latest trends and sharing insights into the future outlook for mobile mapping. Recent advances in mobile mapping technology are enabling new capabilities and complementing – or even replacing – traditional survey methods of topographical surveying. Futhermore, widespread investment in city planning and ‘smart city’ projects is expected to further accelerate the adoption of mobile... (read more)
2018-07-05 01:59:36

Protecting Location Privacy Brings Opportunities to the Geosector

Since members of the geosector are well versed in potential applications of geoinformation and its fusion with other data sources, they are best equipped to devise and test technology-based solutions for location privacy-related challenges. That is the opinion of Dara Seidl, a young expert on geoprivacy, who won the first pan-American master’s thesis contest on geoinformation. (By Frédérique Coumans, contributing editor) Dara Seidl was selected by a jury of worldwide experts as the winner of the ‘Prize for the Outstanding Master’s Thesis in Cartography, Geodesy and Geo-Information 2015’ for her thesis titled ‘Striking the Balance: Privacy and Spatial Pattern Preservation... (read more)
2017-01-17 09:23:46

Underscoring Benefits to Humanity

GIM International interviews Orhan Altan
Professor Orhan Altan, recently appointed president of the ISPRS, the international NGO representing more than a hundred nations and regions across the globe, believes the organisation should prioritise environmental monitoring and sustainable development and so contribute to achieving the Millennium Development Goals. International co-operation, says Altan, for advancement of knowledge, research, development and education in this field, would be boosted by greater publicity for ISPRS scientific achievements and successes and their translation into universally understood language. We asked him about his expectations and dreams as head of one of the most important bodies in the geomatics industry, and the legacy... (read more)
2009-02-27 12:00:00

Multispectral and Thermal Sensors on UAVs

Capabilities for Precision Farming and Heat Mapping
Mini and micro unmanned aerial vehicles (UAVs) in combination with cost-efficient and lightweight RGB cameras have become a standard tool for photogrammetric tasks. In contrast, multispectral and thermal sensors were until recently too heavy and bulky for small UAV platforms, even though their potential was demonstrated almost a decade ago. Nowadays, however, lightweight multispectral and thermal sensors on small UAVs are commercially available. Read more about their capabilities for use in precision farming and heat mapping. (By Stephan Nebiker and Natalie Lack, Switzerland) The multispectral cameras and thermal infrared (TIR) sensor in the authors’ performance tests were mounted on an eBee... (read more)
2016-08-02 09:21:38

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

Comparing DIM and TLS

Capturing an Archaeological Site in Oman
Photogrammetry and terrestrial laser scanning (TLS) are both proven technologies for archaeological documentation. Dense image matching (DIM) has evolved rapidly since 2010 and enables the highly automatic creation of detailed point clouds from overlapping imagery. How well does DIM perform for archaeological applications compared to TLS? The authors go in search of an answer. The necropolis of Al-Ayn in Oman (Figure 1) comprises 19 well-preserved tombs of between 2m and 4m in height which extend over 130m (Figure 1). Since 1988 the tombs have been a UNESCO World Heritage site. The exterior diameters of the slightly conical tombs range from... (read more)
2017-12-20 09:58:55
Search Filter