Zone of Visual Influence (ZVI) Survey

90 per analysis + data costs 150 approx

Email us for a fixed quote : quote@svsurveying.co.uk

Visual Intrusion: Can a single object be seen or not?

In this case the highest point of a fictitious Landfill Site.

A defined grid of 'target' points at a specified grid interval, in this example 25m, and height above the ground is used to determine if the point on top of the landfill is visible. As can be seen it is possible to include the effects of woodland and built up areas. A correction for earth curvature and refraction is optional.

The resulting shaded output indicates the visual intrusion of the point analysed. It can be over displayed on top of the original survey and/or orthophoto/raster map for a clearer picture of which parts of the DTM are visible and which are invisible from the pivot.

Example of Simple Visibility  ZVI

Visual Intrusion ZVI

Visual Influence: How many targets can be seen from a grid of eye points?

A defined grid of 'target' points at a specified grid interval, in this example 50m, and height above the ground is used to determine the number of Wind Turbines visible.

The output produced is a plot containing colour coded text boxes whose colour is defined by the number of points visible from the grid point, the actual number is also displayed if required. The user may choose a transparent box to enable the display of the DTM behind the ZVI result..

Used for Housing developments, Wind Farms, Chimneys and other tall visual structures.

Example of Wind Turbine ZVI

Visual Influence ZVI

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