Focus on Geoinformation Users

Cognitive and Use/User Issues in Contemporary Cartography
Maps have always been important for communicating geographic information to their users. However, although cartographers in the past may have conducted research into how people work with maps, they often did not have the resources to produce multiple versions of maps that had been redesigned based on their findings. Today, cartography is dynamic and interactive: maps change when users interact with them on online and mobile platforms. Producing maps is now easier and cheaper than ever before, and technology has opened up new possibilities for conducting better user research. The latter has ‘paid off’ on many occasions already, as illustrated... (read more)
2013-08-22 03:34:33

Parallel Computing in Photogrammetry

Seamless Orthomosaic Creation from Massive Imagery
The race between data production and processing capacity has been going on for many decades, with data production usually on the winning team. This is also true for airborne and space-borne imagery, as the amount of images captured by satellite sensors and aerial cameras is growing not only steadily but also rapidly. How can the abundance of pixels be processed into photogrammetric products quickly and effectively? The answer lies in parallel computing. Today, computer clusters enable fast and affordable processing of photogrammetric tasks. Read on to learn how parallelism speeds up the creation of seamless orthomosaics. By Andrey Yu. Sechin, Racurs,... (read more)
2016-02-09 10:04:01

Bringing Colour to Point Clouds

Until now, most commercially available airborne Lidar systems have operated on one single wavelength, reflecting energy from a pulse which is then used for classification or visualisation. New developments have produced the first multispectral Lidar systems which scan using laser pulses in a number of different wavelengths. Multispectral Lidar data contains valuable information about the objects scanned. The fast-moving advancements in this field are likely to represent the next technological leap in Lidar systems. (By Sam Fleming, Iain Woodhouse and Antoine Cottin) Lidar systems have fundamentally changed the world of mapping and surveying. Airborne systems can cover large areas and... (read more)
2015-04-03 09:51:58

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

ASPRS Honorary Members Selected

Clifford W. Greve and Vincent V. Salomonson have been selected as the next Honorary Members of the American Society for Photogrammetry and Remote Sensing (ASPRS). Their nominations were recently approved by the ASPRS Board of Directors. This is the highest award bestowed by ASPRS and there can be only 25 living Honorary Members of the Society at any given time. Initiated in 1937, this lifetime award is given for professional excellence in recognition of individuals who have rendered distinguished service to ASPRS and/or who have attained distinction in advancing the science and use of the geospatial information sciences. Greve and... (read more)
2012-11-15 09:12:20

Preserving Technological Monuments in Russia

Terrestrial Laser Scanning of the Aurora Cruiser and the ‘Motherland Calls’ Statue
Technological monuments are vulnerable to decay. 3D modelling and documentation are essential to avoid them falling into irreparable decline and to enable future restoration. Terrestrial laser scanning (TLS) is a proven technology for capturing complex objects. Read about the TLS capture of two iconic technological monuments in Russia: the Motherland Calls statue and the Aurora cruiser. . (By Andrey Leonov and Mikhail Anikushkin, Russia) Technological monuments are more vulnerable to decline than paintings or manuscripts, since they are located outdoors and exposed to rain, temperature variations and other weather elements. They also often suffer from overdue maintenance due to a... (read more)
2016-08-09 08:58:22

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

Calibrating Survey Instruments

A Modern Calibration Bench
The geomatics profession is implicated in several ISO standards. The important ISO9001: 2000 prescribes regular instrument testing and calibration. To help meet required stringent alignment tolerances, a modern calibration bench has been developed for the calibration of survey instruments under internationally recognised COFRAC accreditation. Surveyors must as professionals fulfil certain legal, regulatory and/or accuracy requirements for their clients. They will typically strive to do so in an optimally cost-effective way and with the most appropriate equipment for the job at hand. This naturally requires good understanding of and confidence in the instrumentation employed. Clients want the most from what they... (read more)
2007-07-07 12:00:00

Managing Massive Point Cloud Data: Performance of DBMS and File-based Solutions

Today, Lidar and photogrammetry enable the collection of massive point clouds. Faced with hundreds of billions or even trillions of points, the traditional solutions for handling point clouds usually underperform. To obtain insight into the features affecting performance, tests have been carried out on various systems and the pros and cons have been identified. (By Oscar Martinez-Rubi, Peter van Oosterom and Theo Tijssen, The Netherlands) Point clouds have traditionally been processed into grids, vector objects or other types of data to support further processing in a GIS environment. Today, point clouds are also directly used for estimating volumes of complex objects,... (read more)
2015-09-25 01:11:20
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