Abstract:The need for better 3D documentation of the built environment has come to the fore in recent years, led primarily by city modelling at the large scale and Building Information Modelling (BIM) at the smaller scale. Automation is seen as desirable as it removes the time-consuming and therefore costly amount of human intervention in the process of model generation. BIM is the focus of this paper as not only is there a commercial need, as will be shown by the number of commercial solutions, but also wide research interest due to the aspiration of automated 3D models from both Geomatics and Computer Science communities. The aim is to go beyond the current labour-intensive tracing of the point cloud to an automated process that produces geometry that is both open and more verifiable. This work investigates what can be achieved today with automation through both literature review and by proposing a novel point cloud processing process. We present an automated workflow for the generation of BIM data from 3D point clouds.We also present quality indicators for reconstructed geometry elements and a framework in which to assess the quality of the reconstructed geometry against a reference.

ABSTRACT:The process of capturing and modelling buildings has gained increased focus in recent years with the rise of Building Information Modelling (BIM). At the heart of BIM is a process change for the construction and facilities management industries whereby a BIM aids more collaborative working through better information exchange, and as a part of the process Geomatic/Land Surveyors are not immune from the changes. Terrestrial laser scanning has been proscribed as the preferred method for rapidly capturing buildings for BIM geometry. This is a process change from a traditional measured building survey just with a total station and is aided by the increasing acceptance of point cloud data being integrated with parametric building models in BIM tools such as Autodesk Revit or Bentley Architecture. Pilot projects carried out previously by the authors to investigate the geometry capture and modelling of BIM confirmed the view of others that the process of data capture with static laser scan setups is slow and very involved requiring at least two people for efficiency. Indoor Mobile Mapping Systems (IMMS) present a possible solution to these issues especially in time saved. Therefore this paper investigates their application as a capture device for BIM geometry creation over traditional static methods through a fit-for-purpose test.

There is concern about the high prevalence of adolescent sexual health problems, such as sexually transmitted diseases (STDs) and unwanted pregnancies, that currently exist in the UK. If young people are to reduce their risk from HIV/AIDS and other STDs it is imperative, in the first instance, they know what the risks are and how they can avoid them. However, effective school-based sex education can only be delivered if there are accurate data on young people's current levels of knowledge and existing sex education needs. This paper details findings from the WHO: Health Behaviours of School-aged Children Study on the changes that have occurred between 1990 and 1994 in Scottish school-children's knowledge, attitudes and perceived educational needs in relation to HIV/AIDS. There have been significant changes in knowledge and attitudes that may affect their sexual behaviour, e.g. in their attitudes to condom use, risk of HIV/AIDS and other STDs, and also other sexual health problems, such as the risk of unwanted pregnancies and abortions. Finally, areas that require future research and recommendations for future sexual health education interventions are highlighted.

This article uses a discourse analytic method to explore how a sample of ex-smokers with smoking-related illness position themselves, and are positioned by, the language they use in their accounts of quitting. The article suggests that discursive constructions (having 'no choice' and getting 'another chance') used by the respondents position them in a way that constrains behaviour by closing down the option of smoking and/or opening up the possibility of change. In each telling, the respondents' (non-smoking) identities are confirmed anew and this affirmation may assist in sustaining the change and provide protection against relapse. Moreover, the article suggests that the development and exchange of these stories may contribute to the growth of shared beliefs about the experience of quitting, opening up the option of quitting for current smokers. In so doing, accounts of quitting provided by ex-smokers undermine or resist dominant social understandings that even among those highly motivated to stop smoking, quitting is a difficult, if not impossible, endeavour.

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