TIN-Knoten (3D Analyst)
Zusammenfassung
Exportiert die Knoten eines TIN-Datasets (Triangulated Irregular Network, Unregelmäßiges Dreiecksnetz) in eine Point-Feature-Class.
Abbildung
Verwendung
-
Die Angabe eines Namens für den Parameter Spot-Feld führt zur Erstellung der 2D-Point-Feature-Class. Wenn der Name weggelassen wird, werden 3D-Punkte erstellt.
- Wenn den Dreiecken im TIN Tag-Werte zugewiesen sind, können diese Werte den Punkten als Attribute zugeschrieben werden, indem ein Name im Parameter Tag-Wertfeld angegeben wird. Alle Knoten, denen keine Tag-Werte explizit zugewiesen wurden, nehmen den Wert 0 an.
Syntax
Parameter | Erläuterung | Datentyp |
in_tin |
The input TIN. | TIN Layer |
out_feature_class |
The output feature class. | Feature Class |
spot_field (optional) |
Der Name des Höhenattributfeldes der Ausgabe-Feature-Class. Wenn das Feld benannt wurde, ist die Feature-Class zweidimensional, andernfalls dreidimensional. In der Standardeinstellung wird kein Name angegeben, sodass 3D-Punkt-Features erstellt werden. | String |
tag_field (optional) |
Der Name des Feldes, in dem das Tag-Attribut der Ausgabe-Feature-Class gespeichert wird. Standardmäßig wird kein Tag-Wertfeld erstellt. | String |
Codebeispiel
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.TinNode_3d('tin', 'elevation_node.shp', '', 'Tag_Value')
The following sample demonstrates the use of this tool in a stand-alone Python script:
"""**************************************************************************** Name: Create Terrain from TIN Description: This script demonstrates how to create a terrain dataset using features extracted from a TIN. It is particularly useful in situations where the source data used in the TIN is not available, and the amount of data stored in the TIN proves to be too large for the TIN. The terrain's scalability will allow improved display performance and faster analysis. The script is designed to work as a script tool with 5 input arguments. ****************************************************************************""" # Import system modules import arcpy import exceptions, sys, traceback from arcpy import env # Set local variables tin = arcpy.GetParameterAsText(0) # TIN used to create terrain gdbLocation = arcpy.GetParameterAsText(1) # Folder that will store terran GDB gdbName = arcpy.GetParameterAsText(2) # Name of terrain GDB fdName = arcpy.GetParameterAsText(3) # Name of feature dataset terrainName = arcpy.GetParameterAsText(4) # Name of terrain try: arcpy.CheckOutExtension("3D") # Create the file gdb that will store the feature dataset arcpy.management.CreateFileGDB(gdbLocation, gdbName) gdb = '{0}/{1}'.format(gdbLocation, gdbName) # Obtain spatial reference from TIN SR = arcpy.Describe(tin).spatialReference # Create the feature dataset that will store the terrain arcpy.management.CreateFeatureDataset(gdb, fdName, SR) fd = '{0}/{1}'.format(gdb, fdName) # Export TIN elements to feature classes for terrain arcpy.AddMessage("Exporting TIN footprint to define terrain boundary...") boundary = "{0}/boundary".format(fd) # Execute TinDomain arcpy.ddd.TinDomain(tin, tinDomain, 'POLYGON') arcpy.AddMessage("Exporting TIN breaklines...") breaklines = "{0}/breaklines".format(fd) # Execute TinLine arcpy.ddd.TinLine(tin, breaklines, "Code") arcpy.AddMessage("Exporting TIN nodes...") masspoints = "{0}/masspoints".format(fd) # Execute TinNode arcpy.ddd.TinNode(sourceTIN, TIN_nodes) arcpy.AddMessage("Creating terrain dataset...") terrain = "terrain_from_tin" # Execute CreateTerrain arcpy.ddd.CreateTerrain(fd, terrainName, 10, 50000, "", "WINDOWSIZE", "ZMEAN", "NONE", 1) arcpy.AddMessage("Adding terrain pyramid levels...") terrain = "{0}/{1}".format(fd, terrainName) pyramids = ["20 5000", "25 10000", "35 25000", "50 50000"] # Execute AddTerrainPyramidLevel arcpy.ddd.AddTerrainPyramidLevel(terrain, "", pyramids) arcpy.AddMessage("Adding features to terrain...") inFeatures = "{0} Shape softclip 1 0 10 true false boundary_embed <None> "\ "false; {1} Shape masspoints 1 0 50 true false points_embed "\ "<None> false; {2} Shape softline 1 0 25 false false lines_embed "\ "<None> false".format(boundary, masspoints, breaklines) # Execute AddFeatureClassToTerrain arcpy.ddd.AddFeatureClassToTerrain(terrain, inFeatures) arcpy.AddMessage("Building terrain...") # Execute BuildTerrain arcpy.ddd.BuildTerrain(terrain, "NO_UPDATE_EXTENT") arcpy.GetMessages() 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) finally: arcpy.CheckInExtension("3D")