Set LAS Class Codes Using Features,
Set LAS Class Codes Using Features
How to use Set LAS Class Codes Using Features Tool in Arc Toolbox ArcMap ArcGIS ??
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| Set LAS Class Codes Using Features |
Set LAS Class Codes Using Features Tool, LAS Dataset Toolset, Data Management Toolset, 3D
Analyst Toolbox
Set LAS Class Codes Using Features
Classifies LAS points
that intersect the two-dimensional extent of input features.
1. Input LAS Dataset
The LAS dataset to
process.
2. Input Feature Class
Specify one or more input features that will be used to define class code values for the lidar files referenced by the LAS dataset. The classification flag options default to No change, but can be assigned by choosing Set or removed by choosing Clear. Each feature has the following options:
Features—The features used for reclassifying LAS points.
Buffer Distance—The distance that input features are buffered by prior to determining the LAS points that intersect the buffered area.
New Class—The class code to be assigned.
Synthetic—The Synthetic classification flag is used to identify points that were not obtained from a lidar sensor but were included in the LAS file, such as survey control points that may not have been captured by the lidar sensor.
KeyPoint—The Model Key Point classification flag represents a subset of points that are required to capture a desired level of detail in the lidar collection. Historically, this flag was associated with representing thinned ground points within a specific Z tolerance.
Withheld—The Withheld classification flag signifies erroneous data that should be excluded from analysis and visualization.
Overlap—The Overlap designation identifies points from overlapping scans and is only supported in LAS 1.4 files.
3. Compute Statistics (optional)
Specifies whether statistics should be computed for the LAS files referenced by the LAS dataset. Computing statistics provides a spatial index for each LAS file, which improves analysis and display performance. Statistics also enhance the filtering and symbology experience by limiting the display of LAS attributes, like classification codes and return information, to values that are present in the LAS file.
·
Checked—Statistics will be computed.
· Unchecked—Statistics will not be computed. This is the default.
Thin LAS
How to use Thin LAS Tool in Arc Toolbox ArcMap ArcGIS ??
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| Thin LAS |
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| Thin LAS |
Thin LAS Tool, LAS Dataset Toolset, Data Management Toolset, 3D
Analyst Toolbox:
Thin LAS
Creates new LAS files that contain a subset of LAS points from the input LAS dataset.
1. Input LAS Dataset
The LAS dataset to process.
2. Target Folder
The existing folder that the output LAS files will be written to.
3. Output LAS Dataset (optional)
The output LAS dataset referencing the newly created LAS files.
4. Thinning Dimension
The type of thinning operation that will be conducted.
·
2D—Thinning will occur in tiles defined along the x,y-axis.
· 3D—Thinning will occur in volumes of space defined by tiles along the x,y-axis, and height gradients along the z-axis. This is the default.
5. Target XY Resolution
The size of each side of the thinning tile along the x,y-axis.
6. Target Z Resolution (optional)
The height of each thinning region when using the 3D thinning method.
7. Point Selection Method (optional)
The method used to determine which points are retained in each thinning region.
·
CLOSEST_TO_CENTER—The LAS point that is closest to the center of
the region being thinned. This is the default.
·
CLASS_CODE—The LAS points with the class code that has the highest
weight assigned.
·
PREDOMINANT_CLASS—The LAS points with the most frequent class code
value in the region being thinned.
·
Z_MIN—The lowest LAS point in the region being thinned.
·
Z_MAX—The highest LAS point in the region being thinned.
·
Z_MIN_MAX—The highest and lowest LAS points in the region being
thinned.
·
Z_AVERAGE—The LAS point whose height is closest to the average of
height of all points in the region being thinned.
·
INTENSITY_MIN—The LAS point whose intensity value is the lowest
among the points in the region being thinned.
·
INTENSITY_MAX—The LAS point whose intensity value is the highest
among the points in the region being thinned.
·
INTENSITY_MIN_MAX—The two LAS points with the lowest and the
highest intensity values among the points in the region being thinned.
·
INTENSITY_AVERAGE—The LAS point whose intensity value is closest
to the average of all intensity values from points in the region being thinned.
8. Input Class Codes and Weights (optional)
The weights assigned to each class code that determine which points are retained in each thinning region. This parameter is only enabled when the Class Code Weights option is specified in the Point Selection Method parameter. The class code with the highest weight will be retained in the thinning region. If two class codes with the same weight exist in a given thinning region, the class code with the smallest point source ID will be retained.
9. Output File Name Suffix (optional)
The name added to each output file.
10. Preserved Classes (optional)
The input LAS points with the specified class code values will not be thinned from the output LAS files.
11. Preserved Flags (optional)
The input LAS points with the specified class flag designations will be preserved in the output LAS files.
·
MODEL_KEY—Points with the model key class flag will be preserved.
·
OVERLAP—Points with the overlap class flag will be preserved.
·
SYNTHETIC—Points with the synthetic class flag will be preserved.
· WITHHELD—Points with the withheld class flag will be preserved.
12. Preserved Returns (optional)
The input LAS points with the specified returns will be preserved in the output LAS files.
·
SINGLE—All single return points will be included.
·
LAST—All single and last returns will be included.
·
FIRST_OF_MANY—All points that are the first of multiple returns
will be included.
· LAST_OF_MANY—All points that are the last of multiple returns will be included.
13. Excluded Classes (optional)
The input LAS points with the specified class code values will be excluded from the output LAS files.
14. Excluded Flags (optional)
The input LAS points with the specified class flag designations will be excluded from the output LAS files.
·
MODEL_KEY—Points with the model key class flag will be excluded.
·
OVERLAP—Points with the overlap class flag will be excluded.
·
SYNTHETIC—Points with the synthetic class flag will be excluded.
· WITHHELD—Points with the withheld class flag will be excluded.
15. Excluded Returns (optional)
The input LAS points with the specified returns will be excluded from the output LAS files.
·
SINGLE—All single return points will be excluded.
·
LAST—All single and last returns will be excluded.
·
FIRST_OF_MANY—All points that are the first of multiple returns
will be excluded.
· LAST_OF_MANY—All points that are the last of multiple returns will be excluded.
16. Compression (optional)
Specifies whether the output LAS file will in a compressed format or the standard LAS format.
·
NO_COMPRESSION—The output will be in the standard LAS format
(*.las). This is the default.
· ZLAS—Output LAS files will be compressed in the zLAS format.
17. Remove Variable Length Records (optional)
Indicates whether variable length records stored with the input LAS points will be preserved or eliminated in the output LAS data.
·
Unchecked—Variable length records will be maintained in the output
LAS points. This is the default.
· Checked—Variable length records will be removed from the output LAS points.
18. Rearrange LAS Points (optional)
Indicates if LAS points will be stored in spatially organized clusters.
·
Unchecked—The order of the points in the LAS files will remain the
same.
· Checked—The points in the LAS files will be rearranged. This is the default.
19. Compute Statistics (optional)
Specifies whether statistics should be computed for the LAS files referenced by the LAS dataset. Computing statistics provides a spatial index for each LAS file, which improves analysis and display performance. Statistics also enhance the filtering and symbology experience by limiting the display of LAS attributes, like classification codes and return information, to values that are present in the LAS file.
·
Checked—Statistics will be computed.
· Unchecked—Statistics will not be computed. This is the default.
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