increased confidence = reduced risk - south bim

Laser Scanning Increased Confidence = Reduced Risk

Matthew McCarter - Surveyor

• Working in survey industry 16

years

• Started laser scanning in 2000

• Advisory committee for SPAR EU

and GeoBusiness conferences

• Active in UK BIM community

• Member of Cabinet Office BIM Task

Group “Survey4BIM” committee

• Blog on SPAR Point Group

Website

• Speaker at Autodesk University

18 March 2014 @Oatfedgoat

https://www.sparpointgroup.com/blog.aspx?blogid=18927

https://www.sparpointgroup.com/blog.aspx?blogid=18927

What is a surveyor?

Surveyors Many different names:

SURVEYOR

GEOMATIC ENGINEER

GEOSPATIAL

ENGINEER

GEOMATICIAN

GEOMATIC

SURVEYOR

LAND SURVEYOR

MEASURED BUILDING SURVEYOR

GEOSPATIAL SURVEYOR

What does a Land Surveyor do? “... explore the character and structure of spatial information, its

methods of capture, organisation, classification, qualification,

analysis, management, display and dissemination, as well as the

infrastructure and technologies necessary for the optimal use of

this information”

Essentially, we measure distances & angles

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.

VENDORS CLIENTS

BIM Task Group – BIM4 Communities

Group Goals Provide leadership in establishing how surveyors are integral to the BIM process

Share knowledge and learning between its members

Establish collaborative links to Universities and academia

Produce and publish best practise guidance on survey matters relating to BIM

Coordinate the Survey4BIM activates within survey bodies and institutions

Promote survey related case studies, which demonstrate best practice

Get Involved or Contact Us

@Survey4BIM

www.bimtaskgroup.com/survey4bim

[email protected]

Survey4BIM Group

Laser Scanning

Tape Measure GPS / GNSS Total Station

Measurement Options-Traditional

Typically single point acquisition

Laser Scanner

GLS-2000

Mobile Mapping

IPS-3

Aerial Survey

Falcon 8/Sirius Pro

Measurement Options-Mass Data

Rapid, multiple point acquisition

‣ Selectable Dual Laser • Class 1 = Eye safe and invisible

• Class 3R = 350m+ range

Laser Scanning Key Features

Laser Scanning Sector Applications - Architecture

Laser Scanner

Point Cloud

“Our process works fine without point clouds”

Gartner hype cycle for emerging

technologies

3D Scanning adoption

Sources:

Where to use Laser Scanning?

Construction

Buildings Multiple uses

Topographic and utility surveys

Coastal

Heritage

Power and Utility Surveys

Plant and M & E

Internal Building Surveys

Leisure-Golf Courses

Collision Investigation

Aerospace

Survey & Laser Scanning in BIM

18 March 2014

Client Guide to 3D Scanning and Data Capture

• First BIM Task Group Technical Guide

• Cross industry involvement

http://www.bimtaskgroup.org/wp-content/uploads/2013/07/Client-

Guide-to-3D-Scanning-and-Data-Capture.pdf

http://www.bimtaskgroup.org/wp-content/uploads/2013/07/Client-Guide-to-3D-Scanning-and-Data-Capture.pdf






























18 March 2014

Timeline of 3D Scanning Development

3D Scanning Basics

Capture Quickly + Accurately

“Level of Detail” – Not LOD 50mm point spacing @ 10m distance

“Level of Detail” – Not LOD 25mm point spacing @ 10m distance

“Level of Detail” – Not LOD 12.5mm point spacing @ 10m distance

Registered Point Cloud

Geo-Referenced Point Cloud

3D Wireframe

2D Drawings

3D Surface / Solid Model

Building Information Model

Visualisation

Surveyor

Information

Delivery

Raw Scan Data

Point

Cloud

Options

Vector

Options

Survey Deliverables

RIBA Digital Plan Of Work

How Site Capture Aligns To dPOW

Site Context Required Validation

Operate,

Maintain

+ Update

Site Survey/s Required

Minimise Risk Through The Project Lifecycle

Value of survey work implemented early in project lifecycle – Impact v Cost

0–Strategic Definition

Is there any existing measured survey?

0–Strategic Definition

Client Risks

• Lack of reliable Data on which to make decisions

• What do I have to start with?

• Lack of understanding of available data and possible data and their

implications

• Lack of available, reliable professional consultation

1-Preparation and Brief

Client Risks

• Lack of Survey data

• What is purpose/accuracy/age of the Survey Data

• Different co-ordinate systems

• Misaligned Expectations

• Lack of a Common Technical Language

• Over-surveying or Wrongly identified Data Journey

• Lack of Survey Expertise

Develop project objectives, outcomes, budget, feasibility & brief

PROCESS

TOOLS

WORKFLOW

Mass Data Collection

Software:

Scanmaster

Photography/Mesh/

Pointcloud Point cloud from vehicle mounted mobile laser scan

1-Preparation and Brief

Client Risks • Poor survey specification

• Level of detail

• Accuracy

• Grid

• Lack of survey budget

• Poor design definition

• Lack of or poor Common Data Environment (CDE) & processes

Outline proposals for structural design, building services, project

strategies. Issue final project brief.

2- Concept Design

It’s this easy right?

“Scan 2 BIM”

Client Risks • Failure to verify survey data available

• Resources underused due to waiting for required survey data

• Designers or program delayed due to lack of sufficient survey data

• Survey data delivered but not shared or used to its potential

• Hidden design assumptions in relation to survey data reliability - not

understood or not identified in risk register contingency

Coordinated proposals for structural design, building services,

project strategies, cost information and project strategies

3-Developed Design

Image courtesy of

3-Developed Design

Client Risks • Loss of survey control on site

• Re-surveys = Delays on site, increased cost + risk

• Uncontrolled site changes = Significant lag since last stages of surveys

• Lack of data currency

Prepare Technical Design for architectural, structural and building

services information in accordance with Design Responsibility Matrix

and Project Strategies

4-Technical Design

1. Re-use scan data from previous stages

2. Compare original point clouds to technical design

prior to construction

3. Efficient process, reducing duplication of re-survey

4-Technical Design

Client Risks • Rework causes delays and large additional costs

• Poor survey control

• Offsite manufactured components don’t fit where intended

• Works destruction of survey control

• Coordination of survey activities (e.g. Monitoring v As-built)

• Not recording as-built and planning for hand-back

• Competence of survey resource

• Continued collaboration

Offsite manufacturing and onsite Construction in accordance with

Construction Programme and resolution of Design Queries from site

as they arise.

5-Construction

5-Construction

• Record point clouds of key components

• Underground services, core, structural elements, MEP, dry wall etc

• Compare scanned objects to design model

• Compare to project program in a quantifiable and auditable way.

• Monitor site progress & compare against program

• Identify re-work early

• Simplify prefabrication

• Design model migrates to “As Constructed”?

• Generates true ‘as built 3D BIM’ for use by CAFM systems.

5-Construction Laser Scan at project milestones

5-Construction Detect clashes before site work

5-Construction Point clouds in setting out process

5-Construction Setting Out On Site

Client Risks

• Lack of survey at construction stages or final stage

• Redline .pdf file is only as built data handed over

• No budget left for as-built survey

• As built survey unverified

• As built survey only to final visible finishes

• Lack of verification and validation data at close out stage

• Complete loss of survey control network

Handover of building and conclusion of Building Contract

6-Handover and Close Out

• Post construction handover drawings and

documents

• Typical Industry current practice

• Set of 2D pdf files derived from design

• Set of Operation & Maintenance manuals

• Measured survey rarely performed

6-Handover and Close Out As Builts – Current Practice

• Generate as built model from multiple stage 5 laser scans

• Hidden objects recorded and validated

• “Whilst built” model compiled in near real time

• The Information of BIM is retained from design/fabrication model

• The FM community rejoice

6-Handover and Close Out As Builts – Future Practice?

Client Risks • No proper as built survey undertaken at end of construction

• Building services (MEP) not verified in as built survey

• Provenance of other peoples data

• Lack of standards, codes & specifications

• RICS client specification is not a standard

• Lack of responsibility for who should update model/CDE when

changes occur

Undertake In Use services in accordance with Schedule of Services

7 - In use

• Minor works and maintenance changes

• Capture every change, or need XX per area to trigger recapture?

• Monitor building performance – combine laser scan with thermal camera

7 - In use

Things to consider if you start

using this data……

Point Cloud Files

Commonly Used

Interoperable File Types

LSPROJ

ZFS

CL3

PTG

PTS PCG

TXT

E57 XYZ

ZFSPROJ

PTX

FLS

ASC

BIN

RDS

CLR

LAS 3DD

RDB

POD

RCS

RCP RXP

RSP

PCD

VTK

PN

SOI

Data Storage Massive Files ≠ Big data

Thank you.

Questions?

increased confidence = reduced risk - south bim

Documents