ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / LineOfSightResult Class / VisibleLine Property
Example Version

VisibleLine Property
Gets the visible part(s), if any, of the surface profile, from the perspective of the observer point when looking towards the target point.
Syntax
public Polyline VisibleLine {get;}
Remarks
VisibleLine can be null - meaning the sight line is totally obstructed. It will be projected to the LineOfSightParams.OutputSpatialReference or the spatial reference of the surface if LineOfSightParams.OutputSpatialReference is null.
Example
Get Line of Sight
var losParams = new LineOfSightParams();
losParams.ObserverPoint = observerPoint;
losParams.TargetPoint = targetPoint;

// add offsets if appropriate
// losParams.ObserverHeightOffset = observerOffset;
// losParams.TargetHeightOffset = targerOffset;

// set output spatial reference
losParams.OutputSpatialReference = MapView.Active.Map.SpatialReference;

LineOfSightResult results = null;
try
{
  if (tinLayer.CanGetLineOfSight(losParams))
    results = tinLayer.GetLineOfSight(losParams);
}
catch (Exception ex)
{
  // log exception message
}

if (results != null)
{
  bool targetIsVisibleFromObserverPoint = results.IsTargetVisibleFromObserverPoint;
  //These properties are not used. They will always be false
  // results.IsTargetVisibleFromVisibleLine;
  // results.IsTargetVisibleFromInvisibleLine;


  if (results.VisibleLine != null)
    MapView.Active.AddOverlay(results.VisibleLine, visibleLineSymbol.MakeSymbolReference());
  if (results.InvisibleLine != null)
    MapView.Active.AddOverlay(results.VisibleLine, invisibleLineSymbol.MakeSymbolReference());
  if (results.ObstructionPoint != null)
    MapView.Active.AddOverlay(results.ObstructionPoint, obstructionPointSymbol.MakeSymbolReference());
}
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3.2 or higher.
See Also