Geospatial Analysis and Modelling

The development of GIS and carto-graphy can be characterised as information rich and knowledge poor. That is, the amount of geospatial information collected using geospatial technologies, including remote sensing, global positioning systems and digital mapping technology, has been growing rapidly, whereas geospatial knowledge or ‘useful information’, for decision making in terms of real-world problem solving is rather limited. Terabytes of geospatial information in the form of satellite imagery, aerial photos and maps have been integrated into Google Maps and Google Earth so that ordinary people using a decent internet-connected home computer can zoom from space right down to street level... (read more)
2006-11-20 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
2017-02-22 11:35:23

Thai Damage Analysis

Volunteers from ESRI-Thailand have been to Takua Pa district, the most damaged area in the country, to assist search teams and to analyse tsunami damage using geo-information technology. The most urgent mission shortly after the disaster was to search for survivors and to locate the dead. Maps of the area were generated using aerial orthophotos from the Royal Thai Air Force (RTAF) and satellite images from Geo-Informatics and the Space Technology Development Agency (GISTDA) taken after the tsunami. Comparative maps were produced using 2003 orthophotos from the Ministry of Agriculture and Co-operatives (MOAC) together with the RTAF and GISTDA imagery... (read more)
2005-03-17 12:00:00

Participatory Vulnerability Analysis

"If I had known that the river would flow this way this year, I would not have invested so much in my farm. I could have reduced my losses," rued Bikram, one of thousands of small farmers in Nepal who are regularly surprised by vagaries of nature. His preparations would have been much better had he had access to adequate geo-information, including river behaviour, nature and topography of upper basins, formation of silted islands, trend in river direction and water-tables around his land.   In this dynamic world, couldn't the power of geo-information technology be harnessed to assist people like... (read more)
2009-12-04 11:37:52

Road Safety Analysis

Terrestrial Laser Scanning to Improve Road Safety
With the growing interest in (inter)national road safety programmes comes a need for documentation of road systems for safety analysis and traffic-accident reconstruction studies. This requires reliable, accurate and timely data, which, as the authors demonstrate, Terrestrial Laser Scanning (TLS) can provide. While driver and vehicle factors contribute to crashes, road-risk maps can help identify areas of roads where safety might be improved. Road inventory databases enable the move from 'black-spot treatment', that is improvement of sites associated with a high incidence of crashes, to route management and eventually to network safety management ( Terrestrial laser scanning (TLS) can serve... (read more)
2007-07-07 12:00:00

Industry Image Analysis Solutions

ITT Corporation has announced aninitiative to support the integration of its software technology with the ArcGIS platform from Esri. ITT's Industry Solutions will use ENVI tools in ArcGIS to build models and workflows that add image analysis functionality to industry-specific applications for GIS users. The models and workflows will deliver image analysis solutions for natural resources, government, and defence and intelligence applications, allowing GIS users to easily extract meaningful information from imagery for more accurate and timely decision making.   With this Industry Solutions initiative, ITT Visual Information Solutions is shifting its resources to create industry solutions using image analysis.... (read more)
2011-07-14 11:53:03

Risk Analysis for Gas Utilities

Geography is tied to every element of risk analysis for gas distribution. On this premise, gas utilities are able to use geographic information system (GIS) technology in their work to satisfy Distribution Integrity Management Program (DIMP) regulations, according to Rob Brook, pipeline and gas industry manager for Esri. Brook broaches the subject of GIS for DIMP at Spatial Roundtable, where others in the gas utility industry are encouraged to join the discussion. DIMP regulations, put forth by the U.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration, aim to ensure better overall management of the risks that impact gas... (read more)
2010-09-24 11:23:49

Advances in Spatio-Temporal Analysis

Taylor and Francis (The Netherlands) has released a new publication in the ISPRS Book Series: "Advances in Spatio-Temporal Analysis". The book is edited by Xinming Tang (Key Laboratory of Geo-informatics of State Bureau of Surveying and Mapping, Beijing, China), Yaolin Liu (Wuhan University, People's Republic of China), Jixian Zhang (Chinese Academy of Surveying and Mapping, Beijing, People's Republic of China) and Wolfgang Kainz (University of Vienna, Austria).   Researchers in the field of Temporal Geographical Information Systems (TGIS) have been developing methods of incorporating time into geographical information systems. This book presents new models and techniques in Geographic Information Technology,... (read more)
2007-11-13 10:18:00
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