Domaines TIN (3D Analyst)
Récapitulatif
Crée une classe d'entités linéaires ou surfaciques représentant la zone d'interpolation d'un jeu de données TIN.
Illustration
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Domaines TIN |
Utilisation
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Cet outil permet de produire une enveloppe convexe (polygone d'emprise minimale) autour d'un ensemble de points. Si aucun polygone d'effacement ou de découpage n'est utilisé pour définir le TIN, le domaine équivaut à l'enveloppe convexe.
La géométrie en sortie est placée dans un seul enregistrement d'entité et peut être une géométrie unique ou multi-parties, selon la nature de la zone d'interpolation. Par exemple, si la zone d'interpolation est composée d'îlots ou contient des trous, la géométrie résultante sera multi-parties.
Remarque :3D polygons only contain elevation values along the perimeter of the features, as interior portions of the polygon will not contain any vertices. When drawn in 3D with an area fill, the boundary vertices are arbitrarily connected into triangles for rendering. Unless the polygon is planar, either sloped or horizontal, it's unlikely the fill will accurately represent the interior surface. For this reason, it is recommended that nonplanar 3D polygons are drawn without fill symbology.
Syntaxe
| Paramètre | Explication | Type de données |
in_tin |
The input TIN. | TIN Layer |
out_feature_class |
The output feature class. | Feature Class |
out_geometry_type |
The geometry of the output feature class.
| String |
Exemple de code
The following sample demonstrates the use of this tool in the Python window:
import arcpy
from arcpy import env
arcpy.CheckOutExtension('3D')
env.workspace = 'C:/data'
arcpy.TinDomain_3d('tin', 'tin_domain.shp')
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
try:
arcpy.CheckOutExtension("3D")
# 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")
arcpy.AddMessage("Finished")
arcpy.CheckInExtension("3D")
except arcpy.ExecuteError:
print arcpy.GetMessages()
except:
# 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
arcpy.AddError(pymsg)
arcpy.AddError(msgs)