SCOPE AND SPECIFICATION

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Dale Wheeler
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1 DIGITAL SURVEYS ebim SURVEY SCOPE AND SPECIFICATION

2 1. Contents Contents 1. Contents Company Profile Scope Defining Specifications Overview Detail Levels LEVEL TWO: LEVEL THREE: LEVEL FOUR: Point Cloud Surveys Overview Data Capture Processing and conversion Scanning deliverables The Point Cloud: Truview / Webshare: Pre-Survey Model requirement: Software requirements: Site checklist Scan Data Post Survey Data Storage: Ownership and liability: Appendix A Page 2

3 2. Company Profile Formed in 1988 Digital Surveys is a privately owned company offering a range of specialist survey, dimensional control and industrial measurement services. Over the years we have built a glowing reputation as an innovator in the survey sector. Always at the forefront of measurement technology, Digital Surveys were early adopters of 3D laser scanning and have embraced the latest 3D data capture methods and techniques. We have also become one of the leading experts in point cloud data processing with a strong UK 3D modelling team. Operating globally we provide large and small scale 3D survey solutions to owner operators, asset managers and engineers across the oil and gas, petrochemical, built environment and renewable sectors. So whatever your needs, you can rest assured, we have the team to deliver. For more information contact: Digital Surveys Ltd The Toffee Factory Lower Steenbergs Yard Ouseburn Newcastle Upon Tyne NE1 2DF info@digitalsurveys.co.uk Page 3

4 3. Scope The following document is designed to build a realistic and agreeable expectation of what is required by a client commissioning an ebim (Existing Building Information Model) survey, and what Digital Surveys can deliver. Although the majority of buildings share the same features - walls, windows etc it is common knowledge that every building is unique, even if by the smallest variation and every project will have its own demands. The process of BIM is still a relatively new feature in the surveying sector; without the same detailed regulation and standardisation that is common across the remainder of construction. As such, it is even more important that the process be clear and understood by all - from tender to delivery. The typical survey process, condensed: First contact / enquiry Discuss project requirements / visit site - provide estimate Commission survey and mobilise Laser scan site Process data captured Convert to virtual environment Issue to client Page 4

5 4. Defining Specifications 4.1 Overview There are a number of surveying services that Digital Surveys can provide, although this document will focus on the deliverables that can be provided from laser scanning, focussing on existing buildings. The most common deliverable will be a 3D model created by way of Autodesk s Revit software; as such this will be explained in finer detail, with other deliverables explained in brief later in the specification. 4.2 Building Specification As every existing building is unique, each project will require its own specified detail of documentation some highly detailed, some basic. To try and assist in defining this process we have created 4 generic levels of detail with additional options sheet (appendix A) to define specific requirements. It is important to note that the following levels of detail are provided as a guide / suggestion to what can be delivered. Differing levels of detail can be mixed together for adjacent buildings on a project, or specific detail added to a basic model if so required. Page 5

6 4.3 LEVEL ONE: Solid, basic mass. No window / door openings modelled. Basic building footprint / profile with outline of major extruded features only. Ideal for use in right to light analysis and urban planning. Page 6

7 4.4 LEVEL TWO: Primary structure and elements Documenting the significant features of the building in a co-ordinating style. Windows / doors shown as simple opening with no added detail, such as mullions, opening lights etc. Major internal elements included walls, floors, ceilings, stairs etc. All shown at the lowest level of detail. Major external profiles added in basic form. Primary structure shown as assumed size. Best used for surveys post-strip out with all major elements exposed where a major redesign is scheduled. Page 7

4.5 LEVEL THREE: Standard Survey External facade features in more representative detail. Major roof entities, such as chimney stacks, large plant etc shown as basic mass.

8 4.5 LEVEL THREE: Standard Survey External facade features in more representative detail. Major roof entities, such as chimney stacks, large plant etc shown as basic mass. Major sanitary features (WCs, basis, sinks etc) shown indicatively. Large M&E equipment (boilers, air handling units etc) shown as basic mass. No duct or pipe work unless a major external building feature (a rough guide is anything greater than 100mm square / in diameter) not including RWPs. Railings, balustrading and forms of edge protection in default pattern. Additional detail to doors and windows mullions, opening lights etc. Page 8

4.6 LEVEL FOUR: Highest detail survey. Everything included in the previous two levels, plus; All finer facade features, SVP s, guttering, smaller pipework (<50mm) etc.

9 4.6 LEVEL FOUR: Highest detail survey. Everything included in the previous two levels, plus; All finer facade features, SVP s, guttering, smaller pipework (<50mm) etc. Visible mechanical supply routes (pipes, ducts etc) in 3D. Electrical and communication conduit (major routes, such as cable trays). Site topography to a specified boundary drawing via grid to correct spot heights. Site features: furniture and lighting columns, planting (best match), bollards etc. Major internal fixtures, such as reception desks, stages (not moveable furniture) shown in basic detail. Identifiable construction material intelligently added to the model from site reconnaissance default practice to shown as best match (material type and approximate colour). See enlarged image for example. Page 9

10 Further detail... As mentioned previously, these four levels are to be used as a general guide to the different varying detail that can be delivered. Combining these detail levels with a tick box system (see appendix A) allows the client to adjust the amount of information required on certain elements and add their own project specific requirements. Using these two guides together should clearly identify the scope of the modelling project, eliminate over-modelling and deliver an effective model as quickly as possible. Page 10

11 5. MEP Modelling Guide To assist in defining this process we have created 3 generic levels of detail to greater understand what can be expected from an MEP model. It is important to note that the following levels of detail are provided as a framework / suggestion to what can be delivered. Differing levels of detail can be mixed together or specific extra detail added on request. Page 11

5.1 LEVEL ONE: Solid, basic mass. Cable trays, without hangers. Major pipework no flanges or support shown. Large ducting no connections or support shown.

12 5.1 LEVEL ONE: Solid, basic mass. Cable trays, without hangers. Major pipework no flanges or support shown. Large ducting no connections or support shown. Speciality equipment modelled to indicate extents. Basic model documenting the existing major mechanical and electrical routes. Major routes considered anything >50mm sq / Ø Mapped to the common extent of the route, with no finer detail or intelligence. No surrounding / interfacing building elements. Best used as an economical option for existing

5.2 LEVEL TWO: Standard detail M&E, + surrounding structure and key elements Cable trays, showing hangers. Major pipework with major ancillary pieces. Large ducting with major ancillary pieces.

13 5.2 LEVEL TWO: Standard detail M&E, + surrounding structure and key elements Cable trays, showing hangers. Major pipework with major ancillary pieces. Large ducting with major ancillary pieces. Speciality equipment modelled to indicate extents. Standard model documenting the existing major mechanical and electrical routes in representative detail Major / prominent detail added such as flange connections at bends. Major surrounding / interfacing building elements and fixings, such as machinery. Suitable for most surveys. Page 13

Electrical / comms: Cable trays and conduit, light fittings (best match) domestic and emergency.

14 5.3 LEVEL THREE: Advanced survey Mechanical: Minor routes added (circa <100mm sq / Ø), such as cold and hot water services and sprinkler systems. All significant detail added such as valve types, pressure on pipework and diffusers / intakes on ducts. Electrical / comms: Cable trays and conduit, light fittings (best match) domestic and emergency. Additional : Major surrounding / interfacing building elements and fixings, such as machinery. Best used where space intricate design around existing elements is required. All mechanical and electrical routes elements created in and delivered in Revit MEP, to assist design. Enlarged detail of component Page 14

6. Point Cloud Surveys 5.1 Overview 3D laser scanning has become the preferred method to rapidly capture the as built condition of existing buildings and infrastructure.

2 Data Capture Digital Surveys utilise a number of different laser scanners and will pick the most suitable equipment for a project.

15 6. Point Cloud Surveys 5.1 Overview 3D laser scanning has become the preferred method to rapidly capture the as built condition of existing buildings and infrastructure. The rapid speed of data collection and high accuracy make it ideal for surveying complex and intricate sites, from plant rooms to ornate architectural features. 5.2 Data Capture Digital Surveys utilise a number of different laser scanners and will pick the most suitable equipment for a project. Laser scanners can vary quite drastically in functionality with varying speeds, accuracies etc, however they all provide a number of fundamentally similar deliverables. The scanner emits a laser which can collect up to 1 million points of data per second and for every surface that it hits a point in space (xyz) value is recorded. The scanner will also record an intensity value which is the reflective of the surface. If required colour photos can also be taken using either an inbuilt or external camera kit which allow an rgb value to applied to each point.

Key Benefits: Capture existing conditions Identify errors with 2D documentation Reduce client risk for renovation projects reduce need for physical site survey Assess structural Integrity Monitor

16 Key Benefits: Capture existing conditions Identify errors with 2D documentation Reduce client risk for renovation projects reduce need for physical site survey Assess structural Integrity Monitor construction progress Most projects will be made up of multiple laser scans taken from varying angles. Laser scanners work via line of sight and therefore must have a clear view of the area of interest. Areas that cannot be seen because of obstructions (vegetation, vehicles etc) are known as data voids and should be clearly identified before the project commences. Page 16

Atmospheric conditions also need to be taken in to account when carrying out a laser survey. Scanning can be carried out in light rain however dry conditions are preferable.

17 Atmospheric conditions also need to be taken in to account when carrying out a laser survey. Scanning can be carried out in light rain however dry conditions are preferable. High winds will effect accuracy and heavy lying water or snow will obscure the results. 5.3 Processing and conversion Once the scanning has been completed the point cloud data needs to be processed and registered together to form a complete data set. Using targets visible from each scan or external survey control the scans will be registered together and a mean survey error generated. Digital Surveys can provide a registration error report as part of our QA process if requested. This data set will sit in an arbitrary coordinate system, however if required the point cloud can then be swung and issued to world coordinates. Page 17

18 5.4 Scanning deliverables Unlike a traditional survey a point cloud survey provides a number of different deliverables. As standard Digital Surveys provide the following: 5.41 The Point Cloud: The raw point data once in a registered format can be used to accurately dimension at any point across the site, clash against 3d models and provide virtual tours or simulations. Point Cloud File Formats:.PCG (for use in Autodesk 2012 and newer products).rcp (for use in AutoDesk 2014 products).pts,.pod.ptx,.xyz,.las (raw exported scan data for viewing software).imp, FLS (Cyclone / Faro Project Files) All Digital Surveys projects will come with a.pcg and.pod file as standard Truview / Webshare: Generated as part of the scanning process, this deliverable is a 360 spherical photo record taken at each scan station (much like Google s street view feature). These are packaged and delivered in easy to use online format, via free to download software. All current and future Digital Surveys projects will come with a TruView as standard. Page 18

19 Using the Leica TruView panoramic point cloud viewer, users can view, zoom in, or pan over point clouds naturally and intuitively. Using a simple panoramic or bubble viewer approach, you see High-Definition Survey point clouds on the computer screen just as if you were standing right where the laser scanner captured the scan data. Easy Measuring and Markups In TruView, users can extract real 3D coordinates and accurately measure distances. Results appear right on the point cloud image. Markups are also easy to create, save and share with your peers, your service provider, or with clients for more effective communications. Page 19

20 7. Pre-Survey 6.1 Model requirement: As outlined in Section 2.2, a model can be delivered in varying levels of detail. These levels can be selected by category desired, to make the modelling process efficient by preventing over modelling. For example, a highly detailed survey of the elevations may be required, but only a basic interior. Below is a sample of the list, with the complete list available in Appendix A : L1 L2 L3 L4 Walls Windows, glazing & clear openings X Doors, shutters, archways etc X Structural elements (steel & concrete) X Roofs The list is designed to cover the most commonly found building elements, however, is a non-exhaustive list and as such provision is made later for additions to be made. 1.1 Additional Revit specific requirements Model Positioning: Ordnance Survey national grid position and datum Local / site grid and datum No set coordinates (model draw to default project centre). Project North required? (if yes, specify orientation) Client project template / naming conventions: Specify below if either will be required, if not standard Digital Surveys guide will be used:... Page 20

21 6.2 Software requirements: Revit version(s): Important Revit is only forwards compatible, therefore if in doubt, choose the earlier version. Revit Architecture v2012 Revit MEP v2012 Revit Structure v2012 Revit Architecture v2013 Revit MEP v2013 Revit Structure v2013 Additional export formats:.dwg AutoCAD (specify release).dxf Autodesk TrueView.ifc.gbXML.fbx 6.3 Site checklist Site access requirements (day / night etc) Site contact details Void spaces NOTE: Laser scanning requires clear access routes and line of site throughout a building. Arrangements must be made to allow the survey team unrestricted access to all areas required in the survey. Failure to provide suitable access causing standing time & delays on site would be billed to the client at vat per day. 6.4 Scan Data Scan density (10mm point spacing on detailed areas) Additional point cloud format delivery.pts,.pod.ptx,.xyz,.las.imp, FLS etc Page 21

22 8. Post Survey 7.1 Data Storage: Digital surveys will provide a copy of all data on a portable hard drive or memory stick. Results will be retained by Digital Surveys survey for a period of 6 months before being destroyed. 7.2 Ownership and liability: Digital Surveys will be responsible for: Accurate surveying - by way of calibrated, tested and well used surveying equipment. Accurate conversion of data provided into Revit (and latter) formats. Digital Surveys will not be liable for the following: Any data provided by a third party such as 2D drawings and scan data if the scan data is undertaken by another company. Software compatibility or functioning problems, beyond our control. Specific identification of structural or load bearing elements. Specific identification of materials, beyond basic category and colour. Surveying or modelling inaccessible areas. Page 22

23 9. Appendix A Sample table Walls Windows, glazing & clear openings Doors, shutters, archways etc Structural elements (steel & concrete) Roofs External primary / major: L1 L2 L3 L4 Walls Windows, glazing & clear openings Doors, shutters, archways etc Structural elements (steel & concrete) Roofs Canopies /walkways / pergolas etc Major roof plant and equipment Steps / stairs leading to entrances Balustrade / railings / edge protection Additional Primary external, not listed, please list below: External secondary / minor / detailed L1 L2 L3 L4 Rain water pipes Guttering and all other rainwater goods Major wall based plant and equipment Louvres, grilles, exhausts etc Non-rainwater pipework Lighting / cameras / alarms Signage (indicatively) Masonry detail (in linework) Glazing detail (in linework) Copings / cappings / chimneys Additional Secondary external, not listed, please list below: Page 23

24 Site Surround L1 L2 L3 L4 Topography (within specified area) Boundary walls and fences Trees and large planting inc. planters Street furniture Gates Adjacent buildings (mass only) Manholes & chambers (as lines) Additional Site surround, not listed, please list below: Internal primary / major Partitions Doors / circulation openings Screens / glazing / openings Floors (basic, flat, across level) Stairs / steps / escalators and ramps Lifts / moving platforms (not inc stair lift) Ladders Ceilings (flat, with basic features) Balustrade / railings / edge protection Fixed platforms / decking / walkways Primary structure (where visible) Secondary structure (purlins etc) Additional Primary external, not listed, please list below: Internal minor Sanitary fittings (indicative) Cubicles Fixed furniture (large, counters etc) Radiators Major plant (boilers / water tanks etc) Pipework (>50mm) Sprinkler positions (linework) Signage and lettering (indicative) Page 24

25 Additional Primary external, not listed, please list below: Project specific / non-standard items (please include location and detail required) Page 25

Laser Surveys BIM ready models LASER SURVEYS. BIM Ready Models. A guide for our Clients. P a g e 1

LASER SURVEYS BIM Ready Models A guide for our Clients P a g e 1 Introduction - the purpose of this guide: Survey information for the construction industry has a long-established tradition and is generally