The Tao of Measurement

James Kavanagh MRICS C.Geog MCInstCES

Director Land & Resources Global Group

GeoBusiness 2015

Contents

Measurement

► The language of measurement

► International standards

► BIM and Survey 4 BIM – the RICS experience

► Measured Surveys of land, buildings and utilities 3rd ed 2014

► Conclusions

The language of measurement

Measurement

► Did you really mean that? Just what do you want it for? Fitness for purpose…

► Geo-speak

3 problems, 1 common thread► Valuation ► Development Land► BIM

► Survey Spec

International property measurement standards - IPMS

International Standards

Commonality of language – property components/area registration

Development Land

International Standards

► The ‘inappropriate’ use of measurement depending on development value

► Development that does not fit the ‘site’

► Misunderstanding of survey accuracy and inherent errors

► Misunderstanding of ‘boundary’ issues

► Measured Survey at Development Appraisal stage

BIM – the RICS experience

Lets examine that Elephant …..

Measurement

IPMS► Connecting valuation ‘allowable deviation’ to measured survey accuracy

within IPMS► Depending on purpose $$$$$

Development Land► Appropriate measurement depending on development value

BIM – vender challenge► ‘the spatial integrity of the BIM model was a key issue’► ‘the initial specification of the model is paramount’► ‘there’s needs to be a consistently accurate and continual input to the

model’

The missing link – a coherent, standardised, agreed survey specification

Measured Surveys of land, buildings and utilities 3rd ed 2014

The Tao of Measurement

► Primary focus – client education► Placing the relationship and understanding between client and surveyor at

the core of any survey project

► The Legacy … 2nd ed 1997► Rapid changes in technology and practice► Core survey principles remain► Internationalisation

► New elements:► Survey detail accuracy banding table► Inclusion of survey feature tables► Setting-out, deformation, monitoring► Expanded deliverables

Background, genesis, working group, consultation

► Structure – background information, recommended good practice► Project Information► Survey Accuracy, control, coordinate grid and datum► Topographic surveys► Measured building surveys► Underground utility surveys► Setting out surveys► Monitoring and deformation► Deliverables► Range of Appendixes

Measured Surveys of land, buildings and utilities 3rd ed 2014

Survey detail accuracy band table

Survey detail accuracy and valuation

Control, coordinate grid and datum

Measured Surveys of land, buildings and utilities 3rd ed 2014

► Move towards ppm (in line with GNSS)► Control networks (plan and height)

Measured Surveys of land, buildings and utilities 3rd ed 2014 – topographic survey

► Accuracy band► Emphasis on outputs► Extensive feature table listing

Measured building surveys

Measured Surveys of land, buildings and utilities 3rd ed 2014

► Level of Detail (LoD) – different accuracy bands for different levels of detail

► Output driven► Direct links to IPMS & Code of Measuring Practice► Introduction of BIM as an output► Extensive feature tables

Underground utility surveys► Directly linked to PAS 128► TSA Utility surveys GN

Setting out, deformation and monitoring surveys

Measured Surveys of land, buildings and utilities 3rd ed 2014

► Output driven► Control reuse issues underlined

Monitoring and deformation► Output driven► Types of movement► Features to be monitored► Frequency

Deliverables – the key

Measured Surveys of land, buildings and utilities 3rd ed 2014

► Client requirements► Format and method of delivery► CAD deliverables – client or surveyor defined standards► Digital terrain model (TIN) deliverables and formats► Point Cloud Deliverables (inc. viewer)► GIS► Report deliverables► Imagery, spreadsheet, textual data, survey records, hardcopy► Method of delivery► Receipt► Background information and recommended best practice

BIM as a deliverable

Measured Surveys of land, buildings and utilities 3rd ed 2014

► Connected to employers information requirements (EIR)► BIM execution plan – PAS 1192 -2 (2013)► BIM checklist► Basic survey for BIM specification (connected to accuracy banding and

LOD)

VENDORS

Our mission is to provide a forum for survey organisations and industry professionals to collaborate and share their journey putting

“BIM into practice”, and to provide best practice guidance documents on survey matters relating to BIM.

Get Involved or Contact Us

@Survey4BIM

www.bimtaskgroup.com/survey4bim

Ian Bush: bushi@bv.com

Survey4BIM Group

Conclusions

Measured Surveys of land, buildings and utilities 3rd ed 2014

► Measured Survey specifications and ‘fitness for purpose’ are key to every survey project

► Don’t blind them with Science► Use a language the Client can understand► Do not undersell your skillsets► A common language and known industry

standards/specifications can get surveyors to the top table

► The property profession is vast, an untapped market ….

► The future is bright and shiny and new – and the opportunities for survey, data and measurement Industries are limitless

► Collaboration is everything

Contacts

James Kavanagh MRICS C.Geog MCInstCESDirector Land Group (Environment, Geomatics, Minerals & Waste, Planning & Development, Rural) RICS 12 Great George Street, Parliament Square Parliament Square, London SW1P 3AD T: +44(0) 207 695 1598 Web: http://www.rics.org/land Email: jkavanagh@rics.orgLinkedin: uk.linkedin.com/pub/james-kavanagh/17/48b/654/

Twitter – @jkavanagh99, #RICSland