Medium-format Cameras for High-accuracy Mapping

Field Test of the Phase One iXU-RS1000 Camera
Small and medium-format cameras are increasingly gaining popularity for mapping small and medium-size areas, corridors, construction sites and cities. They are also used as companions of Lidar systems, mounted on unmanned aerial systems (UASs), and for monitoring and inspecting infrastructure. The author of this article investigated the suitability of the Phase One iXU-RS1000 camera for high-accuracy mapping and found this medium-format camera to be a metric camera with stable and clearly definable interior orientation parameters, producing images of high geometric and radiometric quality. In photogrammetry it is important that cameras produce images of which the geometric distortions are as small... (read more)
2018-01-17 10:09:48

Establishing an Operational SBAS Down Under

From Test-bed to Operational System
The Australasian region took a major step towards gaining its first-ever satellite-based augmentation system (SBAS) in early 2017. That is when the governments of Australia and New Zealand agreed to fund a two-year test-bed to evaluate the benefits of SBAS technology across a number of industry sectors in the region. The highly successful test-bed ran from 2017 to 2019 and built the case for the governments of both countries to fund an operational SBAS. SBAS is inherently an aviation technology, originally designed to help aircraft with vertical guidance during landing approaches. It was first developed in the USA (WAAS), followed... (read more)
2020-01-21 01:11:16

Micrometre-level Deformation Monitoring of a Concrete Dam

Accurate and Frequent Deformation Monitoring Using Fibre-optic Cables
Highly accurate measurements with a high temporal resolution have always been a challenge, especially for locations that are hard to reach since conventional geodetic deformation methods are often unsuitable for such locations. With fibre-optic deformation monitoring, cables can be embedded in an object and left alone to provide permanent deformation monitoring measurements. Such a system was installed in a dam in Austria to provide insight into the expansion of joints inside the dam when the reservoir level changes. Hydroelectric power plants are an important source of energy in mountainous regions. The large reservoir lakes behind dams often create a picturesque... (read more)
2017-12-20 11:01:10

Dense Image Matching

Point clouds are increasingly a prime data source for 3D information. For many years, Lidar systems have been the primary way to create point clouds. More recently, advances in the field of computer vision have allowed for the generation of detailed and reliable point clouds from images – not only from traditional aerial photographs but also from uncalibrated photos from consumer-grade cameras. Dense image matching is the powerful technology underpinning this development. (By Martin Kodde) Understanding photogrammetry A good understanding of dense image matching requires insight into the way photogrammetry works. Photogrammetry in itself is not a new technology; it... (read more)
2016-07-15 06:10:43

Precise Thinking and Innovation

NovAtel Inc
Founded in 1983, NovAtel was originally a telecommunications company and since Initial Public Offering in 1997 has been a public company (NASDAQ: NGPS) entirely focused on GNSS and precise-positioning technology. Based in Calgary, Alberta, Canada, it currently employs 250 people. An ISO 9001-certified company, we develop Original Equipment Manufacturer (OEM) products including receivers, antennas, enclosures and software for integration into high-precision positioning applications worldwide. These include surveying, GIS mapping, precision-agriculture machine guidance, port automation, mining and marine industries. Our reference receivers are also at the core of national aviation ground networks in the US, Japan, Europe, China and India. Our... (read more)
2007-04-17 12:00:00

Beyond Cadastre 2014

Let the Dialogue Begin
Multipurpose cadastres, Cadastre 2014, and sustainable land administration have radically altered understanding of cadastres and their potential over the last thirty years. Many of these concepts continue to be relevant. However, the world is not in stasis, so cadastral science must anticipate and facilitate emerging change. The authors present six design elements relating to the role and nature of future cadastres as a starting point for further dialogue. Globalised society will affect the design of future cadastres. Firstly, will be a need for survey-accurate cadastral data; secondly, a shift in focus from land parcels to property objects. Third will be... (read more)
2010-06-28 01:33:15

Guiding Museum Visitors

Indoor Navigation at the Hubei Museum, Wuhan, China
Some museums have been guiding visitors through their exhibitions electronically using audio tours for decades. The audio content is triggered automatically when the visitor enters a room or stands in front of a display. Now that smartphones are ubiquitous, why not employ the latest technology for museum guidance? They are cheaper and more user friendly for visitors and museum management alike, and they can be more informative too. Challenged by this question, seven MSc students from the Delft University of Technology went to Wuhan, China, in early Autumn 2013. Since 2000 various indoor navigation systems have been proposed, all of... (read more)
2014-04-30 12:01:12

Five Years of ‘Works When You Do’

GeoMax Zenith 10&20 RTK GNSS – a flexible system with all communication devices integrated. When GeoMax arrived on the international stage in 2008, many experts doubted whether there was room in the surveying market for another brand alongside the established big players. Now, five years and a major worldwide economic crisis later, GeoMax has secured its place in the sector. From the beginning, the company’s aim was to serve the fast-growing mid-range segment. In line with its ‘works when you do’ concept, GeoMax’s products are focused on offering an attractive price-to-performance ratio. This five-year milestone represents the ideal opportunity to... (read more)
2012-08-24 04:27:00

Sokkia European Headquarters

A Unique Baseline in the Lowlands
Twenty-five years ago, in 1982, the Japanese Sokkisha Company founded its European headquarters in the Netherlands, first in Weesp and then in Almere, a city erected on land reclaimed from the sea. Marketing, warehousing, distribution, service and training for the European market are all done here. But most remarkable is the presence of a baseline for testing EDMs, 2,300 metres long and free of any obstruction - and that in a country as densely populated as the Netherlands. Reasons enough for a visit.<P> The Dutch have never enjoyed an abundance of natural resources beneath their feet. In the late fifties... (read more)
2008-03-06 12:00:00

Object-based Image Analysis

Beyond the Squares
Looking at a satellite image one sees squares (i.e. pixels) representing landscape, although the actual shapes of roads, rivers, lakes, forest and nature reserve might more accurately be represented by lines, circles or irregularly shaped polygons. Over recent years earth observation has become an important data source, while image interpretation has been limited to squares the features of which are spectral variables: colours and invisible radiance determined by reflection-absorption behaviour of landscape objects as observed by satellite sensors. As we view an image our eyes register its spectral characteristics (colour) and shape, the location of an object and its relationship... (read more)
2010-01-28 02:27:00
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