'''****************************************************************************
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.ddd.AppendTerrainPoints(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.ddd.ChangeTerrainResolutionBounds(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)