Available with 3D Analyst license.
Summary
Changes the reference scale associated with a terrain pyramid level.
Usage
Consider changing a terrain pyramid's reference scale if you experience undesirable draw speed performance or require greater densification of data points in the pyramid's display scale range.
It may also be necessary to add or remove a pyramid level when changing the resolution of an existing one, which can be done by using Add Terrain Pyramid or Remove Terrain Pyramid.
When used in an SDE database, the input terrain cannot be registered as versioned.
Syntax
arcpy.3d.ChangeTerrainReferenceScale(in_terrain, old_refscale, new_refscale)
Parameter | Explanation | Data Type |
in_terrain | The terrain dataset to process. | Terrain Layer |
old_refscale | The reference scale of an existing pyramid level. | Long |
new_refscale | The new reference scale for the pyramid level. | Long |
Derived Output
Name | Explanation | Data Type |
derived_out_terrain | The updated terrain. | Terrain Layer |
Code sample
The following sample demonstrates the use of this tool in the Python window.
arcpy.env.workspace = 'C:/data'
arcpy.ChangeTerrainReferenceScale_3d('terrain.gdb/terrainFDS/terrain1',
1000, 2000)
The following sample demonstrates the use of this tool in a stand-alone Python script.
'''****************************************************************************
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
try:
# Set environment settings
arcpy.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(2272)
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 Exception as err:
print(err)
Environments
Licensing information
- Basic: Requires 3D Analyst
- Standard: Requires 3D Analyst
- Advanced: Requires 3D Analyst