Modelling the Erechteion

Extracting Information from Very Large Datasets
Modern terrestrial laser scanners (TLS) generate between 10 and 50 million 3D coordinates per minute: about 500Mbytes of data. Together with high-resolution images for texturing purposes, this is enough information to choke high-end PCs running commercial software. The National Research Council in Canada has developed a framework for extracting information from very large TLS and imagery datasets, an evolution demonstrated in the Erechtheion project. This monument has been modelled in 3D to a spatial resolution of 2mm. The fully textured 3D model containing 348 million polygons can be interactively visualised and analysed in real time.   Creation of an accurate... (read more)
2009-12-04 11:26:58

Modelling Facade Geometry

Facade Recognition Using Mobile Laser Scanner Data
Due to the rapid changes of urbanisation, up-to-date, complex and realistic building models enriched with facade features are increasingly in demand in many countries. The Mobile Laser Scanning technique is progressively being used to capture objects in urban settings and it is becoming a leading source for modelling of facade geometry. This article describes an efficient and cost-effective method for automatically extracting and recognising building-facade features from a complex city environment using MLS point clouds. Mobile Laser Scanning (MLS) is a state-of-the-art technology for accurately and densely capturing the 3D geometry of various objects as 3D point clouds over large... (read more)
2013-10-28 02:03:48

Watershed Modelling in Kentucky

The recently completed Kentucky Watershed Modeling Information Portal (KWMIP), funded through a 750,000USD Co-operative Agreement with the US Environmental Protection Agency (EPA), is an innovative, standards-based data provisioning portal for watershed modellers in the Commonwealth of Kentucky, USA. The portal is integrated with the Kentucky Division of Geographic Information (DGI) web mapping services - KYGeonet (http://kygeonet.ky.gov), KYRaster and KYVector, served over state government LAN, and the US Geological Survey (USGS) StreamStats (http://streamstats.usgs.gov/html/idaho.html). It uses data from the Kentucky Climate Data Generator portals and the EPA’s Environmental Information Exchange Network (EIEN) and STORET (STOrage and RETrieval) repository for water-quality, biological and... (read more)
2006-11-20 12:00:00

Propagation Modelling Accuracy

Mentum and Intermap Technologies, USA, have entered into a collaboration for the delivery of a new generation of height-attributed land-use geodata that addresses the propagation modelling needs of the wireless industry. The telecom-grade product, Cityscapes HD, offers an unmatched level of X, Y and Z accuracy at a price point that enables network operators to manage the large geographical areas required by today's wireless networks. Cityscapes HD is offered at a native resolution of 15m and is available immediately in the USA, Western Europe and parts of Asia.   Cityscapes HD accurately includes the height of vegetation and man-made structures... (read more)
2011-12-13 09:51:25

Modelling Aids Brisbane Flood Crisis

AAM's 3D Flood Simulation of Brisbane, Australia, was used extensively by Australian and Global media during the recent flood crisis in Brisbane. The flood level simulations were produced interactively in 3D. This was a very effective way of communicating the impact of the flood on buildings and infrastructure and it provided a valuable tool in assessing the potential risk for the city in the days leading up to and during the flood peak.   The videos supplied residents, business owners and the public with realistic representations of the predicted flood event.   The flood simulation was based on accurate geospatial... (read more)
2011-01-18 09:14:34

Hurricane Devastation Mapping and Modelling

I-SiTE Studio software, a product of Maptek Pty (Australia), was recently used by a team of engineers and researchers sponsored by the US National Science Foundation to map structural and geotechnical damage to levees and waterways in New Orleans, caused by Hurricane Katrina in August 2005. Scanning was carried out on 10 different sites where levees had failed, and highly detailed 3D models were generated to assist with analysis and reconstruction. More than 180 scans were recorded over 5 days. The objective of the laser scanning was to obtain precise measurements of the ground surface to map soil displacements at... (read more)
2005-11-16 12:00:00

3D Modelling of Fez

A Model from Aerial/Terrestrial Imagery and Topographic Maps
The ancient imperial city of Fez, Morocco, is an important tourist attraction and has been listed as a UNESCO World Heritage Site since 1981. The layout of the city is complex, which presents challenges in terms of 3D modelling. Here, the authors discuss a pilot aimed at creating a 3D model of Fez using topographic maps and aerial and terrestrial imagery. Overlapping 1:4,000 aerial images were used to create a digital surface model (DSM) and orthoimages. Orthoimages and topographic maps were used to manually delineate the footprints of buildings, roads, rivers and suchlike. Terrestrial imagery of single buildings from multiple... (read more)
2015-03-31 09:34:33

Detailed 3D Facade Modelling

A new solution from GTA (Germany) and Procedural offers more 3D detail in modelling of large databases of real-world building data. Special focus is set to add depth to the facade, as well as roof details. CityEngine imports 3D buildings generated automatically using GTA’s software solution Tridicon 3D, transfers detailed tridiconTM3D façade description to CityEngine building parameters and generates rich and visually pleasing procedural 3D buildings.     In addition to its highly efficient modelling tools, there is GTA’s 3D database with more than 175 European cities and 5.400 km² real-world building data available. Highlights are the 3D city model... (read more)
2011-04-11 12:00:00

Dedicated Building Information Modelling Academy

Crossrail and Bentley Systems, UK, have launched a dedicated Information Academy to provide hands-on technology and software training to the Crossrail supply chain for designing and building the new railway including 3D Mapping and Building Information Modelling (BIM). The Information Academy will capture, develop and share BIM best practices with the Crossrail supply chain. The increased use of BIM by the industry is a key element of the Government Construction Strategy. Andrew Wolstenholme, Crossrail’s chief executive, said that Crossrail is pioneering the use of Building Information Modelling in Europe on a scale that has not been undertaken before. This has... (read more)
2012-08-23 03:38:21

3D Modelling of Castles

Integrating Techniques for Detail and Photo-realism
Three-dimensional documentation of heritage buildings is important for conservation, restoration and education. When it comes to complex architectural structures such as castles, no single modelling technique is capable of yielding cost-effective, highly detailed and accurate photo-realism. The authors demonstrate how integration of multiple techniques brings resolution.<P> Castles are unique and fascinating structures of complex architecture the style of which has evolved over centuries. Three-dimensional modelling aims at capturing all geometrical detail, both exterior and interior, and representing these features with high-resolution triangular meshes for accurate documentation and photo-realistic visualisation. Modelling complex and large-scale architecture requires the integration of multiple techniques,... (read more)
2008-02-19 12:00:00
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