Creates a 'Viewshed' QZone from the Item origin over source Grid Items from another Overlay.
{ "Operation": "Item.ViewshedQZone", "PropertyMap": { "_filter$": "_FC& IN (1,2,3)", "_overlay$": "LayerName", "_radius@": "1" } }
Note:
Properties shown in RED are mandatory.
Filter expression
A filter expression, eg '_FC& IN (1,2,3)' or 'grid_type$="DEM"', to use when finding the source Grid Items
Overlay
The name of the Overlay containing the source Grid Items
Radius
The 'Viewshed' radius, as a simple value, or as an expression, eg '12.34' or 'Max(123.4,broadcast_range#)'
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