摘要
执行分析和显示 terrain 数据集时所需的任务。
用法
在初始定义参与 terrain 的要素、对参与 terrain 的要素进行后续修改，或修改 terrain 金字塔定义之后，使用此工具。
与执行各单个编辑后运行构建相比，在批量执行编辑后进行构建更有效率。
语法
BuildTerrain_3d (in_terrain, {update_extent})| 参数 | 说明 | 数据类型 |
in_terrain | 待处理的 terrain 数据集。 | Terrain Layer |
update_extent (可选) | 当数据区域在编辑过程中变小时，将重新计算基于窗口大小的 terrain 数据集的数据范围。如果数据范围已增加，或者 terrain 数据集基于 z 容差，则无需使用此命令。它会扫描所有 terrain 数据以确定新范围。
| String |
代码实例
BuildTerrain 示例 1（Python 窗口）
下面的示例演示了如何在 Python 窗口中使用此工具。
import arcpy
from arcpy import env
arcpy.CheckOutExtension('3D')
env.workspace = 'C:/data'
arcpy.BuildTerrain_3d('test.gdb/featuredataset/terrain')
BuildTerrain 示例 2（独立脚本）
下面的示例演示了如何在独立 Python 脚本中使用此工具。
"""****************************************************************************
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")