LAS Dataset Statistics (Data Management)

Available with 3D Analyst license.

Available with Spatial Analyst license.

Summary

Calculates or updates statistics for a LAS dataset and generates an optional statistics report.

Usage

• Computing statistics will create a spatial and attribute index that helps optimize display and analysis performance. Statistics also provide a more accurate estimate for average point spacing, and additional details about point attributes. The statistics are stored in a file with the same name as its corresponding LAS file, but ending in the .lasx extension.

• Statistics enable filtering options for a LAS dataset layer to automatically display the available class codes and return values in the LAS files. The LAS dataset layer can be filtered through its Layer Properties dialog box or the Make LAS Dataset Layer tool.

• The optional statistics report file provides an overview of LAS properties of all files in the LAS dataset or each individual LAS file in a text format that can be imported into any number of applications.

• If a LAS file's classification codes or flags are modified, its statistics get invalidated and will need to be recomputed. Similarly, if a LAS dataset has new LAS file references added, it also will result in the statistics being invalidated.

Parameters

Dialog

Label	Explanation	Data Type
Input LAS Dataset	The LAS dataset that will be processed.	LAS Dataset Layer
Skip Existing (Optional)	Specifies whether statistics will be calculated for all lidar files or only for those that do not have statistics: Checked—LAS files with up-to-date statistics will be skipped, and statistics will only be calculated for newly added LAS files or ones that were updated since the initial calculation. This is the default. Unchecked—Statistics will be calculated for all LAS files, including ones that have up-to-date statistics. This is useful if the LAS files were modified in an external application that went undetected by ArcGIS.	Boolean
Output Statistics Report Text File (Optional)	The output text file that will contain the summary of the LAS dataset statistics.	Text File
Summary Level (Optional)	Specify the type of summary contained in the report. DATASET—The report will summarize statistics for the entire LAS dataset. This is the default. LAS_FILES—The report will summarize statistics for the LAS files referenced by the LAS dataset.	String
Delimiter (Optional)	The delimiter that will be used to indicate the separation of entries in the columns of the text file table. SPACE—A space will be used to delimit field values. This is the default. COMMA—A comma will be used to delimit field values. This option is not applicable if the decimal separator is also a comma.	String
Decimal Separator (Optional)	The decimal character that will be used in the text file to differentiate the integer of a number from its fractional part. DECIMAL_POINT—A point will be used as the decimal character. This is the default. DECIMAL_COMMA—A comma will be used as the decimal character.	String

Derived Output

Label	Explanation	Data Type
Updated Input LAS Dataset	The updated LAS dataset.	LAS Dataset Layer

Python

arcpy.management.LasDatasetStatistics(in_las_dataset, {calculation_type}, {out_file}, {summary_level}, {delimiter}, {decimal_separator})

Name	Explanation	Data Type
in_las_dataset	The LAS dataset that will be processed.	LAS Dataset Layer
calculation_type (Optional)	Specifies whether statistics will be calculated for all lidar files or only for those that do not have statistics: SKIP_EXISTING_STATS—LAS files with up-to-date statistics will be skipped, and statistics will only be calculated for newly added LAS files or ones that were updated since the initial calculation. This is the default. OVERWRITE_EXISTING_STATS—Statistics will be calculated for all LAS files, including ones that have up-to-date statistics. This is useful if the LAS files were modified in an external application that went undetected by ArcGIS.	Boolean
out_file (Optional)	The output text file that will contain the summary of the LAS dataset statistics.	Text File
summary_level (Optional)	Specify the type of summary contained in the report. DATASET—The report will summarize statistics for the entire LAS dataset. This is the default. LAS_FILES—The report will summarize statistics for the LAS files referenced by the LAS dataset.	String
delimiter (Optional)	The delimiter that will be used to indicate the separation of entries in the columns of the text file table. SPACE—A space will be used to delimit field values. This is the default. COMMA—A comma will be used to delimit field values. This option is not applicable if the decimal separator is also a comma.	String
decimal_separator (Optional)	The decimal character that will be used in the text file to differentiate the integer of a number from its fractional part. DECIMAL_POINT—A point will be used as the decimal character. This is the default. DECIMAL_COMMA—A comma will be used as the decimal character.	String

Derived Output

Name	Explanation	Data Type
derived_las_dataset	The updated LAS dataset.	LAS Dataset Layer

Code sample

LasDatasetStatistics example 1 (Python window)

The following sample demonstrates the use of this tool in the Python window:

import arcpy
from arcpy import env

env.workspace = "C:/data"
arcpy.LASDatasetStatistics_3d("test.lasd", "NO_FORCE", "LAS_FILE", 
                            "DECIMAL_POINT", "SPACE", "LAS_summary.txt")

LasDatasetStatistics example 2 (stand-alone script)

The following sample demonstrates the use of this tool in a stand-alone Python script:

'''*********************************************************************
Name: Modify Files in LAS Dataset& Calculate Stats for LASD
Description: Adds files & surface constraints to a LAS dataset, then
             calculates statistics and generates report.
*********************************************************************'''
# Import system modules
import arcpy

try:
    # Script variables
    arcpy.env.workspace = 'C:/data'
    lasd = 'sample.lasd'
    oldLas = ['2006', '2007/file2.las']
    newLas = ['2007_updates_1', '2007_updates_2']
    oldSurfaceConstraints = ['boundary.shp', 'streams.shp']
    newSurfaceConstraints = [['sample.gdb/boundary', '<None>',
                              'Soft_Clip']
                             ['sample.gdb/streams', 'Shape.Z',
                              'Hard_Line']]
    arcpy.management.RemoveFilesFromLasDataset(lasd, oldLas,
                                               oldSurfaceConstraints)
    arcpy.management.AddFilesToLasDataset(lasd, newLas, 'RECURSION',
                                          newSurfaceConstraints)
    arcpy.management.LasDatasetStatistics(lasd, "UPDATED_FILES",
                                          "lasd_stats.txt",
                                          "LAS_FILE", "DECIMAL_POINT",
                                          "SPACE", "LAS_summary.txt")
except arcpy.ExecuteError:
    print(arcpy.GetMessages())
except Exception as err:
    print(err.args[0])

Environments

Current Workspace