ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Core.CIM Namespace / CIMGeoFeatureLayerBase Class / ShowPreviousObservations Property
Example Version

ShowPreviousObservations Property
Gets or sets a value indicating whether previous observations are being drawn.
Syntax
public bool ShowPreviousObservations {get; set;}
Example
Set Various Stream Layer properties via the CIM
//The layer must be track aware and spatial
if (streamLayer.TrackType != TrackType.Spatial)
  return;
//Must be on QueuedTask
//get the CIM Definition
var def = streamLayer.GetDefinition() as CIMFeatureLayer;
//set the number of previous observations, 
def.PreviousObservationsCount = (int)streamLayer.GetExpirationMaxCount() - 1;
//set show previous observations and track lines to true
def.ShowPreviousObservations = true;
def.ShowTracks = true;
//commit the changes
streamLayer.SetDefinition(def);
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also