SearchPoints Method (LasDatasetLayer)

In This Topic

Retrieves the points in the LAS dataset layer that satisfy the criteria set in the . If no filter is set, all points will be retrieved. This method must be called on the MCT. Use QueuedTask.Run.

Syntax

C#
Visual Basic (Declaration)

public LasPointCursor SearchPoints( 
   LasPointFilter filter
)

Public Function SearchPoints( _
   ByVal filter As LasPointFilter _
) As LasPointCursor

Parameters

filter: Filter by parameters. See ArcGIS.Core.Data.Analyst3D.LasPointFilter. A null value will retrieve all points in the LAS layer.

Return Value

A ArcGIS.Core.Data.Analyst3D.LasPointCursor.

Exceptions

Exception	Description
ArcGIS.Core.CalledOnWrongThreadException	This method or property must be called within the lambda passed to QueuedTask.Run

Remarks

If there is an existing display filter set on the layer, the Search() method will work on the subset of points in the layer that meet the display filter definition criteria. The search filter will be applied after the LAS dataset layer's display filter.

To ensure maximum robustness, callers should explicitly dispose of the returned ArcGIS.Core.Data.Analyst3D.LasPointCursor in either a using statement or a finally block.

Example

Search for LAS Points

// searching on the LasDatasetLayer will honor any LasPointDisplayFilter

// search all points
using (ArcGIS.Core.Data.Analyst3D.LasPointCursor ptCursor = lasDatasetLayer.SearchPoints(null))
{
  while (ptCursor.MoveNext())
  {
    using (ArcGIS.Core.Data.Analyst3D.LasPoint point = ptCursor.Current)
    {

    }
  }
}

// search within an extent
ArcGIS.Core.Data.Analyst3D.LasPointFilter pointFilter = new ArcGIS.Core.Data.Analyst3D.LasPointFilter();
pointFilter.FilterGeometry = envelope;
using (ArcGIS.Core.Data.Analyst3D.LasPointCursor ptCursor = lasDatasetLayer.SearchPoints(pointFilter))
{
  while (ptCursor.MoveNext())
  {
    using (ArcGIS.Core.Data.Analyst3D.LasPoint point = ptCursor.Current)
    {

    }
  }
}

// search within an extent and limited to specific classification codes
pointFilter = new ArcGIS.Core.Data.Analyst3D.LasPointFilter();
pointFilter.FilterGeometry = envelope;
pointFilter.ClassCodes = new List<int> { 4, 5 };
using (ArcGIS.Core.Data.Analyst3D.LasPointCursor ptCursor = lasDatasetLayer.SearchPoints(pointFilter))
{
  while (ptCursor.MoveNext())
  {
    using (ArcGIS.Core.Data.Analyst3D.LasPoint point = ptCursor.Current)
    {

    }
  }
}

Search using pre initialized arrays

// search all points and process with a set size of array retrieving only coordinates
using (ArcGIS.Core.Data.Analyst3D.LasPointCursor ptCursor = lasDatasetLayer.SearchPoints(null))
{
  int count;
  Coordinate3D[] lasPointsRetrieved = new Coordinate3D[10000];
  while (ptCursor.MoveNextArray(lasPointsRetrieved, null, null, null, out count))
  {
    var points = lasPointsRetrieved.ToList();

    // ...
  }
}

// search within an extent
// use MoveNextArray retrieving coordinates, fileIndex and pointIds
ArcGIS.Core.Data.Analyst3D.LasPointFilter filter = new ArcGIS.Core.Data.Analyst3D.LasPointFilter();
filter.FilterGeometry = envelope;
using (ArcGIS.Core.Data.Analyst3D.LasPointCursor ptCursor = lasDatasetLayer.SearchPoints(filter))
{
  int count;
  Coordinate3D[] lasPointsRetrieved = new Coordinate3D[50000];
  int[] fileIndexes = new int[50000];
  double[] pointIds = new double[50000];
  while (ptCursor.MoveNextArray(lasPointsRetrieved, null, fileIndexes, pointIds, out count))
  {
    var points = lasPointsRetrieved.ToList();

  }
}

Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3.2 or higher.

Reference

LasDatasetLayer Class
LasDatasetLayer Members

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