更改 Terrain 参考比例 (3D Analyst)

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	输入 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")

环境

当前工作空间, 临时工作空间, 自动提交

许可信息

ArcGIS for Desktop Basic:需要 3D Analyst

ArcGIS for Desktop Standard:需要 3D Analyst

ArcGIS for Desktop Advanced:需要 3D Analyst