需要 3D Analyst 许可。
摘要
更改与 terrain 金字塔等级相关联的参考比例。
用法
如果遇到不希望出现的绘制速度表现，或在金字塔显示比例范围内需要更密集的数据点，则考虑更改 terrain 金字塔的参考比例。
更改现有金字塔等级的分辨率时，可能还必须添加或移除金字塔等级，而这可通过使用添加 Terrain 金字塔或移除 Terrain 金字塔来完成。
如果在 SDE 数据库中使用，则输入 terrain 将无法注册为版本。
语法
ChangeTerrainReferenceScale_3d (in_terrain, old_refscale, new_refscale)
| 参数 | 说明 | 数据类型 |
in_terrain | 待处理的 terrain 数据集。 | Terrain Layer |
old_refscale | 现有金字塔等级的参考比例。 | Long |
new_refscale | 金字塔等级的新参考比例。 | Long |
代码实例
ChangeTerrainReferenceScale 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.ChangeTerrainReferenceScale_3d('terrain.gdb/terrainFDS/terrain1',
1000, 2000)
ChangeTerrainReferenceScale 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: Update Terrain
Description: This script demonstrates how to update a terrain dataset
with new elevation measurements obtained from Lidar by
importing LAS files to multipoint features, then appending the
new points to another multipoint feature that participates in a
terrain. The terrain's pyramids are modified to optimize its
draw speed.
****************************************************************************'''
# Import system modules
import arcpy
from arcpy import env
import exceptions, sys, traceback
try:
arcpy.CheckOutExtension("3D")
# Set environment settings
env.workspace = "C:/data"
# Set Variables
inTerrain = "sample.gdb/featuredataset/terrain"
currentPts = "existing_points"
lasFiles = ['las/NE_Philly.las',
'las/NW_Philly.las']
newPts = 'in_memory/update_pts'
# Define spatial reference of LAS files using factory code
# for NAD_1983_StatePlane_Pennsylvania_South
lasSR = arcpy.SpatialReference()
lasSR.factoryCode = 2272
lasSR.create()
arcpy.AddMessage("Converting LAS files to multipoint features...")
arcpy.ddd.LASToMultipoint(lasFiles, newPts, 1.5, 2, 1,
'INTENSITY', lasSR)
arcpy.AddMessage("Appending LAS points to {0}..."\
.format(currentPts))
arcpy.AppendTerrainPoints_3d(inTerrain, currentPts, newPts)
arcpy.AddMessage("Changing terrain pyramid reference scales...")
arcpy.ddd.ChangeTerrainReferenceScale(inTerrain, 1000, 500)
arcpy.ddd.ChangeTerrainReferenceScale(inTerrain, 2500, 2000)
arcpy.AddMessage("Adding terrain pyramid level...")
arcpy.ddd.AddTerrainPyramidLevel(inTerrain, "", "4 4500")
arcpy.AddMessage("Changing pyramid resolution bounds for breaklines...")
arcpy.ChangeTerrainResolutionBounds_3d(inTerrain, "breaklines", 5, 4)
arcpy.AddMessage("Building terrain...")
arcpy.ddd.BuildTerrain(inTerrain)
arcpy.AddMessage("Completed updates.")
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")