Delineate TIN Data Area (3D Analyst)


Redefines the data area, or interpolation zone, of a triangulated irregular network (TIN) based on its triangle edge length.

Learn more about how Delineate TIN Data Area (3D Analyst) works


Delineate tin data area illustration



DelineateTinDataArea_3d (in_tin, max_edge_length, {method})
ParameterExplanationData Type

The input TIN.

TIN Layer

Triangles with at least one edge that exceeds <max_edge_length> will be masked out as NODATA. These triangles will not be rendered in maps and will not be used in surface analysis such as interpolation. Length is the 2D distance.


The method used for delineating the TIN's data area.

  • PERIMETER_ONLYIterates through triangles from the TIN's outer extent inward and will stop when the current iteration of boundary triangle edges does not exceed the Maximum Edge Length. This is the default.
  • ALLClassifies the entire collection of TIN triangles by edge length.

Code Sample

DelineateTINDataArea example 1 (Python window)

The following sample demonstrates the use of this tool in the Python window:

import arcpy
from arcpy import env

env.workspace = "C:/data"
arcpy.DelineateTinDataArea_3d("elevation", 10, "PERIMETER_ONLY")
DelineateTINDataArea example 2 (stand-alone script)

The following sample demonstrates the use of this tool in a stand-alone Python script:

Name: Define Data Boundary of LAS File
Description: This script demonstrates how to delineate data boundaries of 
             LAS files with irregularly clustered points. It is intended for 
             use as a script tool with one input LAS file.
# Import system modules
import arcpy
import exceptions, sys, traceback

# Set local variables
inLas = arcpy.GetParameterAsText(0) #input LAS file
ptSpacing = arcpy.GetParameterAsText(1) # LAS point spacing
classCode = arcpy.GetParameterAsText(2) # List of integers
returnValue = arcpy.GetParameterAsText(3) # List of strings
outTin = arcpy.GetParameterAsText(4) # TIN created to delineate data area
outBoundary = arcpy.GetParameterAsText(5) # Polygon boundary file

    # Execute LASToMultipoint
    arcpy.AddMessage("Creating multipoint features from LAS...")
    lasMP = arcpy.CreateUniqueName('lasMultipoint', 'in_memory')
    arcpy.ddd.LASToMultipoint(inLas, LasMP, ptSpacing, class_code, 
                             "ANY_RETURNS", "", sr, inFormat, zfactor)
    # Execute CreateTin
    arcpy.AddMessage("Creating TIN dataset...")
    arcpy.ddd.CreateTin(outTin, sr, "{0} Shape.Z masspoints"\
                       .format(lasMP), "Delaunay")
    # Execute CopyTin
    arcpy.AddMessage("Copying TIN to delineate data boundary...")
    arcpy.ddd.CopyTin(outTin, "{0}_copy".format(outTin))
    # Execute DelineateTinDataArea
    arcpy.AddMessage("Delineating TIN boundary...")
    maxEdge = ptSpacing * 4
    arcpy.ddd.DelineateTinDataArea(outTin, maxEdge, "PERIMETER_ONLY")
    # Execute TinDomain
    arcpy.AddMessage("Exporting data area to polygon boundary...")
    arcpy.ddd.TinDomain(outTin, outBoundary, "POLYGON")
except arcpy.ExecuteError:
    print arcpy.GetMessages()
    # Get the traceback object
    tb = sys.exc_info()[2]
    tbinfo = traceback.format_tb(tb)[0]
    # Concatenate error information into message string
    pymsg = 'PYTHON ERRORS:\nTraceback info:\n{0}\nError Info:\n{1}'\
          .format(tbinfo, str(sys.exc_info()[1]))
    msgs = 'ArcPy ERRORS:\n {0}\n'.format(arcpy.GetMessages(2))
    # Return python error messages for script tool or Python Window


Related Topics

Licensing Information

ArcView: Requires 3D Analyst
ArcEditor: Requires 3D Analyst
ArcInfo: Requires 3D Analyst