ArcGIS Pro 3.3 API Reference Guide
ArcGIS.Core.Geometry Namespace / IGeometryEngine Interface / CalibrateMsByDistance Method
The multipart to copy and update.
The points with the new M-values. If the X and Y values match a point in the multipart, then the M-value of that point will be updated with the M-value of the input point.
The method to use when updating M-values of points that are not included in points. You can use a combination of update methods by using the bitwise OR operator. For example, to interpolate between the input points and to extrapolate before the input points, use UpdateMMethod.Interpolate | UpdateMMethod.ExtrapolateBefore.
The distance along the multipart that determines if points are considered for calibration. Points that are farther than the distance along the multipart are not calibrated. If you want all the points to be considered for calibration, use the length of the multipart.
Example

In This Topic
    CalibrateMsByDistance Method (IGeometryEngine)
    In This Topic
    Calibrates M-values using M-values of input points.
    Syntax

    Parameters

    multipart
    The multipart to copy and update.
    points
    The points with the new M-values. If the X and Y values match a point in the multipart, then the M-value of that point will be updated with the M-value of the input point.
    updateMMethod
    The method to use when updating M-values of points that are not included in points. You can use a combination of update methods by using the bitwise OR operator. For example, to interpolate between the input points and to extrapolate before the input points, use UpdateMMethod.Interpolate | UpdateMMethod.ExtrapolateBefore.
    ignoreGaps
    cutOffDistance
    The distance along the multipart that determines if points are considered for calibration. Points that are farther than the distance along the multipart are not calibrated. If you want all the points to be considered for calibration, use the length of the multipart.

    Return Value

    An updated version of the input multipart.
    Exceptions
    ExceptionDescription
    The input multipart is null.
    The input multipart is not M-Aware.
    Example
    Calibrate M-values using segment lengths and M values from input points - CalibrateMsByDistance
    List<MapPoint> points = new List<MapPoint>();
    
    MapPointBuilderEx pointBuilder = new MapPointBuilderEx(0, 0);
    pointBuilder.HasM = true;
    pointBuilder.M = 0;
    points.Add(pointBuilder.ToGeometry());
    
    pointBuilder.SetValues(0, 8);
    pointBuilder.M = 12;
    points.Add(pointBuilder.ToGeometry());
    
    pointBuilder.SetValues(0, 18);
    pointBuilder.M = 10;
    points.Add(pointBuilder.ToGeometry());
    
    pointBuilder.SetValues(0, 28);
    pointBuilder.M = 14;
    points.Add(pointBuilder.ToGeometry());
    
    pointBuilder.SetValues(0, 32);
    pointBuilder.M = 20;
    points.Add(pointBuilder.ToGeometry());
    
    pointBuilder.SetValues(0, 38);
    pointBuilder.M = 26;
    points.Add(pointBuilder.ToGeometry());
    
    pointBuilder.SetValues(0, 50);
    pointBuilder.M = 30;
    points.Add(pointBuilder.ToGeometry());
    
    Polyline polyline = PolylineBuilderEx.CreatePolyline(points, AttributeFlags.HasM);
    // The points in the polyline are (0, 0, 0), (0, 8, 12), (0, 18, 10), (0, 28, 14), (0, 32, 20), (0, 38, 26), (0, 50, 30)
    
    // Calibrate Ms using points (0, 8, 15), (0, 28, 30), (0, 38, 20)
    points.Clear();
    pointBuilder.SetValues(0, 8);
    pointBuilder.M = 15;
    points.Add(pointBuilder.ToGeometry());
    
    pointBuilder.SetValues(0, 28);
    pointBuilder.M = 30;
    points.Add(pointBuilder.ToGeometry());
    
    pointBuilder.SetValues(0, 38);
    pointBuilder.M = 20;
    points.Add(pointBuilder.ToGeometry());
    
    double cutOffDistance = polyline.Length;
    
    // ExtrapolateBefore
    Polyline updatedPolyline = GeometryEngine.Instance.CalibrateMsByDistance(polyline, points, UpdateMMethod.ExtrapolateBefore, true, cutOffDistance) as Polyline;
    // The points in the updated polyline are
    // (0, 0, 9), (0, 8, 15), (0, 18, 10), (0, 28, 30), (0, 32, 20), (0, 38, 20), (0, 50, 30)
    
    // Interpolate
    updatedPolyline = GeometryEngine.Instance.CalibrateMsByDistance(polyline, points, UpdateMMethod.Interpolate, true, cutOffDistance) as Polyline;
    // The points in the updated polyline are
    // (0, 0, 0), (0, 8, 15), (0, 18, 22.5), (0, 28, 30), (0, 32, 26), (0, 38, 20), (0, 50, 30)
    
    // ExtrapolateAfter
    updatedPolyline = GeometryEngine.Instance.CalibrateMsByDistance(polyline, points, UpdateMMethod.ExtrapolateAfter, true, cutOffDistance) as Polyline;
    // The points in the updated polyline are
    // (0, 0, 0), (0, 8, 15), (0, 18, 10), (0, 28, 30), (0, 32, 20), (0, 38, 20), (0, 50, 8)
    
    // ExtrapolateBefore and Interpolate and ExtrapolateAfter
    updatedPolyline = GeometryEngine.Instance.CalibrateMsByDistance(polyline, points, UpdateMMethod.ExtrapolateAfter, true, cutOffDistance) as Polyline;
    // The points in the updated polyline are
    // (0, 0, 9), (0, 8, 15), (0, 18, 22.5), (0, 28, 30), (0, 32, 26), (0, 38, 20), (0, 50, 8)
    
    Requirements

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3.3 or higher.
    See Also