proposed development bridge road, lymington methodology … · 2017-03-10 · contents 1.0 overview...

Proposed developmentBridge Road, Lymington

Verifiable photomontage images,methodology and supporting evidence

October 2011

Contents

1.0 Overview

2.0 Methodology for creation of photomontage views 2.1 Photography and filming 2.2 Survey 2.3 3D model 2.4 Camera matching and rendering 2.5 Post production 2.6 Caveats

3.0 Supporting evidence

4.0 Verifiable planning images

Page 4

Page 4

Page 7

Page 21

1.0 Overview

This document has been prepared by Designhive Media Ltd to explain the methodology used for producing verifiable photomontage images for the proposed development Bridge Road, Lymington. The visual assessment of the proposed development reflects current best practice in relation to the verification of images (a process which is constantly being refined and improved with advances in technology and industry experience).

The purpose of this appendix is to present an accurate overview of the proposed development which enables its effect on the skyline and important settings and sensitive locations to be objectively evaluated with regard to relevant planning policy criteria.

During this document, you will be guided through a step-by-step description of how Designhive produced an accurate representation of the proposed building in pictorial form to explain the process used including statements from the survey team and photographer. The methodologies described in this document are based on current best practice and follow recommendations from The Landscape Institute’s “Guidelines for Landscape and Visual Impact Assessment” (2nd Edition 02) and their subsequent advice note “Photography and Photomontage in Landscape and Visual Impact Assessment” (01/11). Eleven viewpoints were identified, illustrating the general range of visibility across the zone of visual influence. Six of these viewpoints have been selected for photomontages (as agreed with New Forest District Council).

The entities responsible for the preparation of the views that are set out in the following pages comprise:

Photography Arc Minute Ltd62 Grove Park TerraceLondon W4 3QEPhone: 07774 857627

Production and checking of verifiable images Designhive Media LtdThe Workshop, Old Barn CottageDown Lane, ComptonGuildford GU3 1DQPhone: 01483 813888

Survey of existing views and camera locationsDatum Survey Services LtdBrickfield Business CentreBrickfield HouseHigh Road, ThornwoodEpping CM16 6TH Phone: 07977 111935

Supply of 3D model for buildingAvery Architects270 Vauxhall Bridge RoadLondon SW1V 1BBPhone: 020 7233 6262

Supply of planting plan and tree removal planMurdoch WickhamSouth Ash ManorSouth Ash Road, AshSevenoaks TN15 7ENPhone: 01474 871265

2.0 Methodology

2.1 Photography

The photographer employed on this project was briefed byDesignhive to work to a methodology which conforms to theprinciples recommended in the Guidelines for Landscape and Visual Impact Assessment 2002 and advice notes subsequently issued 01/04 “Use of Photography and Photomontage in Landscape and Visual Impact Assessment”.

The methodology ensures that appropriate combination of lenstypes are chosen to reflect as closely as possible to what can be seen by the human eye and take into account key visual receptors within each view. A consistent approach is taken for comparative purposes throughout the project.

The following statement has been supplied by the photographer:

Methodology statementBRIDGE ROAD, LYMINGTON

The following methodology applies to the production of photographic images originated November 2010, which form the pictorial basis for visual impact assessments and photomontages for 6 views.

Equipment used: Images are captured on a 21mp digital SLR with a sensor size of 36 x 24mm which is dimensionally equal to a 35mm film image frame. Using lenses in the 24-50mm range (74-40 degree horizontal FOV) on suitably sized printed output the system is capable of matching the maximum detail observable by a person with average vision if they were standing at the camera position. Choice of a lens for a particular viewpoint is outside the scope of this specific methodology section and must be established in advance. Lenses in this range are ‘shift’ designs which allow vertical framing adjustment without moving the lens axis off its horizontal orientation and thus maintain 2 point perspective and parallel vertical lines in the image.

Image capture procedure: The camera is mounted on a tripod at eye level which is around 1.6m. The coordinate on the camera system which coincides with the coordinate of the virtual render camera

is positioned in relation to a standard survey nail to a tolerance of 2mm XYZ. The orientation of the camera is set by a spirit level so that the target point of the optical axis and the horizontal axis of the sensor is aligned with the astronomical horizon to an accuracy of 30mm per 100m. Where long distance views are taken the affects of the earth curvature and atmospheric refraction mean that the target point derived from such an orientation does not coincide an object at the same height AOD as the camera and this must be taken into account by the end user and a correction factor applied according to standard survey formulas. The mount is designed to rotate the camera in a horizontal plane around a vertical axis from the survey point which ensures that each image in the sequence has an identical camera position coordinate to eliminate parallax errors in overlapping imagery for panoramic cylindrical images or misaligned joints on 40 degree adjacent rectilinear section imagery. Images are captured using the native camera RAW format to ensure maximum tonal and colour information is retained for use in the image processing stage. Choices for aperture and focus distance are designed to render all parts of the scene ‘in focus’ which avoids ‘leading the eye’ to a selected distance from the camera position. Supplementary photographs are taken to record the survey nail and the camera position in the location.

Post production: The camera files are imported into a proprietary image processing application which converts the RAW camera data into ‘lossless’ RGB format files suitable for use in 2D image editing and 3D modelling applications. At this stage there are also tonal and colour adjustments which aim to replicate the scene as honestly as possible as it was perceived by the photographer at the time of capture. Lens correction software remaps the image to remove any non-perspective optical distortions in order to enable perfect alignment of rendered survey points with their corresponding targets on the photograph in all parts of the frame. Where cylindrical panoramic imagery is required an overlapping sequence which covers the required FOV is imported into proprietary software which creates a seamless and accurate cylindrical projection from a single camera coordinate identical to that of the individual frames in the sequence. The image is then placed in a pre prepared template where the centre of the optical axis is aligned with the image centre to account for any offset used in vertical farming adjustments. Camera, lens and image technical parameters necessary for alignment with the virtual camera are included in a text layer in accordance to specific end user requirements and always contain the following core parameters which will are sufficient to enable another party to replicate the process:

• Camera coordinate height above survey nail• Lens focal length• Sensor size• Time and date of photograph

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2.2 Survey

The base photography for each of the views was supplied to the survey team who place their survey equipment in the exact position the photograph was taken before identifying the OS coordinates through GPS equipment. The following statement has been supplied by the surveyors:

Methodology statementBRIDGE ROAD, LYMINGTON

Designhive brief the survey team to survey points that cover the width and depth of the 6 base photographs measuring the heights and distances of between 12 and 15 significant points in the foreground, mid ground and background within (the centre section) of each view.Laser technology is used to record the position of physical elementsin the photograph such as lampposts, roof tops, trees, corners ofwindows, road kerbs etc. Survey measurements relate back toOrdnance Survey grid and level datum and their accuracy has beenchecked relative to the fixed camera position. The survey data is supplied on a spreadsheet showing viewing position, camera location co-ordinates, Ordinance XYZ co-ordinates - eastings, northings & elevation.

Date of surveys: November 2010

Survey equipment: The survey works were undertaken using GPSequipment together with a Leica TCRA 1205 Total Station instrument,which incorporates long range reflectorless electronic distancemeasuring equipment. An accuracy of + or – 45mm to Ordnance Survey grid/datum was achieved.

2.3 3D modelThe three-dimensional computer models of the development (which is superimposed upon the existing views) was taken from a 3D model supplied by Avery Architects, adequate for massing purposes for the block model and wireline views. A series of spot height checks were performed across the site by Designhive against AOD height information supplied by the architects.

2.4 Camera matching and rendering

The particular method that has been used to verify the photomontage views of the proposed development is set out below. The verification process confirms the accuracy of the three dimensional model in relation to each existing views. The details of the Ordnance Survey co-ordinates for each viewpoint, and the angle of each view has also been checked as part of the verification process. The next step in the process involves accurately positioning the three-dimensional

model of the proposed development within each existing view. This is achieved through a process of matching the surveyed points in the digitised image with those recorded by the survey team on the existing photographs. The central horizon line in each of the existing views is then calculated and imported into 3D Studio Max as a backdrop to the 3D model. The survey points as well as the specifications of the lens type relating to each existing view is also entered into 3D Studio Max. The survey points of the camera position and those relating to specified objects within each particular baseline image are then highlighted on the digitised image. A further check of the accuracy of the survey points in each digitised existing view is carried out by overlaying the central horizon line of each existing view with the digitised survey points prepared in 3D Studio Max. This additional check ensures that the survey points match precisely. This exercise requires meticulous attention to detail. Once the process of camera matching is complete, the three-dimensional model of the proposed development is accurately positioned within each of the existing views. This is achieved by rendering the camera matched three dimensional model of the proposed development within 3D Studio Max at the same size as the digitised existing view.

2.5 Post production

For the block model views, the render of the three-dimensional model is then superimposed on the existing still views in Adobe Photoshop. The foreground of the existing views i.e. trees, lampposts, cars, buildings etc, are then copied and placed over the rendered model in order to ensure that the depth is accurate within the photomontage view between the foreground, background and the rendered model. For the wireline views, the render of the three-dimensional model is superimposed on the existing still views in Adobe Photoshop. A red keyline is then generated to replicate the outline of the building (shown as a solid line where the scheme is visible, and a dotted line where obscured by foreground items like trees, other buildings, lamp posts etc).

Some existing trees were removed and new ones added (as 3D rendered elements) based upon instruction from Murdoch Wickham.

2.6 Caveats

None.

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Ordnance Survey co-ordinates

Photo points Eastings Northings Height

3.0 Supporting evidence

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02 06 07 08

09 10

432765.512 432995.791 433001.153 432816.432 432572.977 432430.098

96045.446 95984.737 95884.494 95572.155 95564.314 95695.082

2.541 1.967 2.317 1.772 17.369 19.051

01.1 Ordnance Survey co-ordinates


View 02

01.3 View 02 OS E - 432765.512m N - 96045.446m H - 2.541m

01.2 OS survey points marked on photograph

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01 02 03 04 05 06 07 08 09 10 11 12 13 14 15

432770.155432762.085432756.393432750.052432707.167432770.354432920.367432928.681432942.986432947.262432951.197433037.098433024.915432995.050432985.015

96048.96396041.51696039.76396028.23095990.84796048.04396140.41796132.41096130.96796107.20096102.86095958.84395914.87695845.86095843.058

3.921 3.604 5.026 4.901 5.663 3.629 9.493 9.435 7.486 9.829 9.795 9.617 6.780 5.099 4.624

01.4 Screen grab of camera location in 3D Studio Max software

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01.5 Screen grab of horizon line centred

01.6 Screen grab of camera matching to OS data

01.7 Screen grab of wireline model matched to photograph

01.8 Final camera matched photomontage



View 06

01.3 View 06 OS E - 432995.791m N - 95984.737m H - 1.967m

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01 02 03 04 05 06 07 08 09 10 11 12 13

432997.658432984.963432984.962432760.379432780.386432661.681432751.467432805.025432927.454432994.540432996.524432707.167432766.006

95979.64095843.03195843.04295663.85695890.10595877.55196025.84396078.00796047.93195988.51695980.57095990.84795571.168

1.923 7.729 4.630 9.868 10.373 7.073 3.005 2.169 1.714 2.962 2.912 5.663 7.068


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View 07

01.3 View 07 OS E - 433001.153m N - 95884.494m H - 2.317m

12

01 02 03 04 05 06 07 08 09 10 11 12

432989.747432984.959433000.931433000.905432692.365433006.397432984.953432766.006432760.379432751.467432805.025432927.454

95844.397 95843.040 95880.481 95888.534 95725.086 95856.126 95843.049 95571.168 95663.856 96025.843 96078.007 96047.931

7.736 7.728 3.314 3.242 11.448 7.565 4.625 7.068 9.868 3.005 2.169 1.714


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View 08

01.3 View 08 OS E - 432816.432m N - 95572.155m H - 1.772m

14

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15

432771.900432766.006432770.980432773.095432806.896432770.005432781.691432800.297432808.045432812.655432868.191432826.002432800.864432807.115432808.775

95565.01695571.16895604.23195605.99895578.31895634.08795642.77095584.64795593.37695692.48395653.32095576.86995601.34395575.58295572.348

14.635 7.068 4.682 4.673 6.170 7.155 4.415 2.341 2.644 4.650 4.807 2.698 1.150 1.965 2.691


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View 09

01.3 View 09 OS E - 432572.977m N - 95564.314m H - 17.369m

16

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15

432574.270432584.233432580.580432597.796432599.001432607.548432633.001432667.862432670.029432595.152432581.696432576.557432578.701432577.063432576.372

95581.90595585.84395583.64395591.46695591.51495594.85295605.54095616.81895612.36795576.27095567.32795565.15895566.64895569.14095581.985

21.036 20.466 18.054 22.382 18.590 18.524 19.990 17.524 17.539 21.330 19.944 19.890 16.989 17.483 18.042


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01.4 Screen grab of camera location in 3D Studio Max software 01.6 Screen grab of horizon line centred 01.7 Screen grab of camera matching to OS data

01.8 Screen grab of wireline model matched to photograph 01.9 Final camera matched photomontage



View 10

01.3 View 10 OS E - 432430.098m N - 95695.082m H - 19.051m

18

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15

432434.826432439.403432444.213432472.993432484.201432474.037432578.681432508.230432489.952432446.119432452.024432498.873432491.243432434.682432433.016

95710.14095710.24095706.35295723.02295729.68395720.10695777.65495730.92295711.13695694.08895697.80795631.85095628.65395690.69895701.204

19.808 19.937 20.857 26.203 23.306 18.619 11.270 20.367 20.604 20.249 20.217 27.698 27.685 18.884 19.756 01.2 OS survey points marked on photograph

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4.0 Verifiable planning images

View 02

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Existing Focal length 51.564mm | HFOV 220 degrees | Camera height above survey point 1671mm | Date15.11.10 | Time 12.21 BST

Proposed

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Proposed

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Proposed

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Proposed

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Proposed

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proposed development bridge road, lymington methodology … · 2017-03-10 · contents 1.0 overview...

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