UAS Lidar for Ecological Restoration of Wetlands

How New Technologies Are Helping to Preserve the Environment
Wetlands are essential ecosystems which provide numerous benefits to society as a whole. But their functionality strongly depends on the hydrology and topography of the watershed, thus creating the need for monitoring. The use of terrestrial topographical survey methods can be a challenging task in wetlands, however. Flooded areas, muddy terrain and low vegetation can substantially slow down or even prevent the movement of surveyors, while tall vegetation can obstruct GPS reception. As this article outlines, advanced technologies such as airborne or UAS Lidar offer interesting alternatives for surveying the hydrology and topography of wetlands. Wetlands are ecosystems where water... (read more)
2019-03-26 10:24:42

GIS in Archaeology

The Human/Environment Interface of Maya Settlements
Throughout history the physical and cultural environment has influenced location and distribution of settlements. One important question in archaeological research is what are the causal relationships between environmental factors on the one side and location and distribution of settlements on the other? The authors demonstrate GIS to be a powerful analytical tool in finding answers to this question as it relates to Maya settlement patterns in Central America. Clues to the relationships between environmental factors and location and distribution of settlements are preserved in many existing maps. Combining these maps with remote sensing data and non-spatial information from a variety... (read more)
2005-12-29 12:00:00

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

Geospatial Co-operation in Vulnerable Sahel

AGRHYMET: Serving the Sahel Region with Geo-information and Training
To monitor the environmental changes and find solutions in the vulnerable Sahel region, the AGRHYMET institute (AGRiculture, HYdrology and METorology) was established thirty years ago. AGRHYMET aims at collecting, processing and managing biophysical and socio-economic data. Furthermore, the organisation services the Sahelian countries with information and training to cope with challenges in food security, natural resource management and desertification control. The Sahel region is a zone stretching across the African continent from the Cape Verde Islands and Mauritania to Sudan. The region is synonymous with desertification, drought and harsh living conditions. Man-induced changes to vegetation from overgrazing and intensive use... (read more)
2005-03-17 12:00:00

Statutory versus Customary II

Institutional Weaknesses in Nepal
Of the roughly thirty million people living in Nepal, a majority belongs to peasant households and lives below the international poverty line of $1.25 a day. The peasant population has also, under former customary land tenure arrangements, been exploited and pauperised. Land related statutory acts introduced since 1951 have not brought security of rights for the actual cultivators of the land, and thus discourage investment in it. Thanks in part to institutional weaknesses, land administration services are today distrusted by the population. The author inventories these weaknesses and provides suggestions for solution. For many centuries farming has been the principle... (read more)
2011-01-04 02:37:56

A Brilliant Career

GIM International interviews Gottfried Konecny
Professor Gottfried Konecny, one of the most respected names in photogrammetry, shares some reflections on his work and profession. He worked in post-war Neumarkt as a teenage draughtsman, was chief surveyor on the 1965 Canadian Mount Kennedy expedition, mapped the lunar landing site at NASA, and has been involved in nearly all the European space mapping missions. And these are just some of Professor Gottfried Konecny’s extraordinary achievements. Today emeritus professor at the University of Hannover, he shares withGIM Internationalsome of the highlights of a career in photogrammetry that has spanned well over six decades.<P> Why did you choose a... (read more)
2009-07-17 12:00:00

How Google Gave Geography its Groove Back

GIM International interviews Ed Parsons
Once upon a time, the study of the Earth's surface, its features, inhabitants and phenomena was nothing more than a tiresome school subject for the average person on the street. Google has changed all that with its interactive map of the world. Stitched together from aerial and satellite footage, it has been downloaded more than 400 million times, with people and organisations putting it to all sorts of interesting uses, from spying on celebrities to locating the nearest hotel in a foreign city. We spoke to Ed Parsons, Google's geospatial technologist, to find out more about what lies ahead for... (read more)
2009-03-03 12:00:00

A Visit to...Hewlett Packard Barcelona

Hewlett Packard (HP) celebrates the twentieth anniversary of its Barcelona site this year. The company has a portfolio spanning printing, personal computing, software, services and IT infrastructure, and Barcelona is the nerve centre of its predominant large-format printing activities. On 3rdand 4thApril 2008 the international professional press was invited to look ‘Behind the Scenes’.<P>   "Our workforce in Barcelona consists of more than two thousand people, including employees working in our engineering and support facilities," Francois Martin introduces us to the facility. Since 2006 he has been marketing director for Graphic Arts. As might be expected, nearly 75% of the... (read more)
2008-05-17 12:00:00

Geomatics Education in Australia

Developments in Geomatics Education (7)
Surveying/geomatics education programmes for the training of professional surveyors in Australia were introduced in each state in the second half of the twentieth century, replacing an articled pupil system that had operated for more than a century. There are currently about 1,100 equivalent full-time undergraduate geomatics students in the eight four-year geomatics programmes, with approximately two hundred graduating each year. The preferred optimum would be twice that number. Reduced government funding and declining enrolment on geomatics courses have put education institutions under increased pressure to rationalise their programmes, resulting in reduced staff numbers and, in some cases, closures. Formal programmes... (read more)
2007-06-14 12:00:00

Using Geospatial Acoustics to Track Bat Movements

Infrastructure plays a significant role in disrupting the flight paths of bats. Traditional methods of monitoring bat movements are rather limited and often prone to error. Using acoustics, GIS and 3D simulation engines, the Bat3Data system enables the field ecologist to differentiate between species and trace their flight paths in 3D along existing and proposed infrastructure. This helps to gauge the efficiency of gantries, bat bridges and underpasses in helping bats to cross roads and railway lines. The system can help to improve the remediation of ecological corridors affected by infrastructure. (By Vivian Raiborde, Frédéric Jehan and Hippolyte Pouchelle) With... (read more)
2015-11-10 03:43:18
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