This layer allows the grouping of environmental sensors to be used to monitor an area with particular emphasis on the boundary of that area.
Figure 69: Environmental Sensor Polygon Settings Tab
In terms of attributes, display and parent logic, the environmental sensor polygon layer behaves exactly the same as a regular polygon layer.
Environmental sensor polygon layers monitor the environmental impacts on an area by deploying a number of environmental sensors along the border of each polygon as well as on a grid within the polygon. Figure 69 above shows how to control how the environmental sensors are allocated to each polygon.
Line step - the interval at which environmental sensor points are added around the border of each polygon.
Interior grid - if checked, sensors are added on a grid with the selected resolution. The exact location of the sensors is not under control of the user.
Taken individually, the points behave as regular individual environmental sensor points that you would find in an Environmental Sensor Layer. The additional benefit of this type of layer is that in addition to being able to avoid digitising in each point, each polygon object gives a unified results which is:
o In the case of Noise, the single largest noise value
o In the case of Shadow Flicker, the amount of shadow-flicker minutes calculated from the combined calendar of all of the sensor points in the polygon object.
o In the case of Visual Impact, each of the tips visible, hubs visible and horizontal impact fields take the maximum value amongst all sensors in the polygon object.
