Category Archives: Virtual Reality

Conductor Line Sag in Grid Projects

One of the features we  added recently is drawing realistic looking Conductor lines between towers on our Grid projects.

Prior to VentusAR 5.4 we drew straight lines between the connector points on the tower models. This had the effect of fairly unrealistic looking conductor lines as even across the shortest distance the conductor lines sag slightly due to gravity.

This post shows some examples of the line sag development and adds some more detail on how the line sag is calculated.

Catenary Formula

The line sag formula we use when displaying the conductor lines on a transmission project is based on a generalisation of the catenary formula. To calculate the sag at a given point we use the following formula:

LineSag_Formula

Where:

  • a is half the distance between towers (in meters)
  • y is the drop at that point in the conductor (in meters)

Maths Example

Lets take a worked example, if the towers were 200m apart, then the variable a would be 100. We can calculate the value at three sample points:

  • at x = 0 the sag due is calculated as 0m – which would make sense – it is at the top of the tower
  • at x = 200 the sag is calculated as 0m – it also makes sense as it at the top of the other tower
  • at x= 100, the sag calculated is 10.033m – this is the bottom of the catenary curve

This is easiest shown with a graph. Below is a screenshot (with slight optical illusion):

LineSag_Graph

Visual Example

When drawing the line sag, we calculate thirty points along the wire and work out the sag between each of those points  – we then draw a series of straight lines between each point.  Our curve is actually a series straight lines between each of these points, but as you can see the visual impact is effective.

IMG_0172

IMG_0203

Line sag modelling has been added to all Grid projects that use conductor lines.

Limitations

This is only an approximation of how line sag works, I have asked an engineer how line sag is actually calculated and discovered it is far more complicated than I wanted to represent in a generic Visual Assessment tool like VentusAR.

This formula could cause conductor lines to be drawn underground – it is up to the person who set up the model to ensure that the span between towers is reasonable.  Custom modelling is, of course, available on any project where additional detail is required.

More Information

For more information about line sag and how we can help you visualise and assess your Grid projects, tower and conductor lines, give us a shout at hello@ventusar.com

VentusAR included in 3D Technology in Planning Report

This week the research report “USE OF DIGITAL AND 3D VISUALISATION TECHNOLOGY IN PLANNING FOR NEW DEVELOPMENT” was published by the Scottish Government.Planning_Report

This independent report examines the role and potential of digital imagery and 3D visualisation in the planning process in Scotland. Produced by the James Hutton Institute in Aberdeen, it was commissioned to inform the review of the planning system.

The report makes reference to the work of Linknode in the use, acceptance and value of 3D visualisation in planning, especially for real-time, in-situ visualisations for better contextual understanding of change and development (George – our technical director – was especially pleased as the report includes a photo of him using VentusAR at Clyde Wind Farm).

GBIt details the importance of digital equivalence in planning and how future advances in 3D visualisations should be embraced by local authorities and developers at earlier stages in the planning process to improve engagement and understanding.

Linknode entirely support this direction and look forward to on-going participation in the development of 3D visualisation in planning & development in Scotland and beyond. To be involved further, review the “Places, People and Planning” consultation of the future of the Scottish Planning System with opportunities to respond.

Report History and Scottish Planning Review

As previously blogged, this is part of the Scottish Planning Review that started with a call for evidence in September 2015.  The response to this was published in July 2016 (our comments here), leading to the commissioning of a report in October 2016 into the use of 3D visualisation technology in planning for new development.  This was funded by the Planning & Architecture Division of the Scottish Government.

Case Study: VentusAR

Out of the 44 bits of technology mentioned in the the report, our VentusAR and UrbanPlanAR solutions for delivering visualisations is noted as the only mobile augmented reality tool (see Annex A for full list).  Of course, we are also based in Glasgow making our contributions innovative, relevant and local!

The report provides a case study on VentusAR for providing in-field Augmented Reality for Agri-Renewables. The key benefits highlighted in this case study are:

  • The use of real world imagery (still or animated) provides high levels of realism for use at early stages of a project.
  • A low cost and level of risk associated with the investment in the visual representations.
  • The incorporation of real-world video enables the representation of movement in the landscape (e.g. swaying trees, vehicles) […] and thus important in coherent representation of a scene of proposed change.
  • Coherence supports the impression of credibility of visualisations.

About VentusAR

We are already providing our clients with the tools to better visualise and communicate their developments. Our online case studies include:

Green Cat Renewables

Greencat Solar visualisationWhen using VentusAR, GreenCat Renewables estimate they save 30% of the time required to visualise and assess Solar and Wind projects. Read the full case study.

 

LDA Design

VentusAR - Wind Turbine Visualisation LDALDA Design benefits from being able to rapidly evaluate projects early on in the development lifecycle and being able to clearly communicate information to clients and consultees. Read the full case study.

Hoolan Energy

Aerial photography of the Hesta Project

Hoolan Energy used VentusAR to do better public engagement for the Costa and Hesta wind projects in Orkney.   Read the full case study or watch the videos: Costa and Hesta.

 

Find out More

You can read more about VentusAR (our product for delivering visualisations in a rural environment) and UrbanPlanAR (for creating visualisations in an urban environment).

If you would like to know more about our visualisation processes and how we can help you communicate your project to stakeholders and the public, drop us a line: hello@linknode.co.uk

Exploring through a 360 panoramic photograph

As a company, Linknode are always looking for new ways of presenting information that could help our customers.
Recently we have been trying out Google Cardboard as a way to present 360° photographs. As you’ll see below, these 360° photographs look good and work well, so today we are announcing the VentusAR Cardboard app: a way of display gallery images in a Google Cardboard. Continue reading