3D Analyst Tools ArcToolbox

Classify LAS Noise

How to use Classify LAS Noise Tool in Arc Toolbox ArcMap ArcGIS ??

Classify LAS Noise

Classify LAS Noise Tool, LAS Dataset Toolset, Data Management Toolset, 3D Analyst Toolbox

Classify LAS Noise

Classifies LAS points with anomalous spatial characteristics as noise.

1.    Input LAS Dataset

The LAS dataset to process.

2.    Method (optional)

The noise detection method that will be used.

· ISOLATION—Spatial proximity of LAS points will be analyzed in tiled volumes to determine noise measurements along with height based noise detection. This is the default.

· RELATIVE_HEIGHT—All points below the specified minimum height from the ground surface and above the maximum height from the ground surface will be identified as noise.

· ABSOLUTE_HEIGHT—All points below the specified minimum height and above the maximum height in relation to mean sea level will be identified as noise.

3.    Edit Classification (optional)

Indicates whether LAS points identified as noise will be reclassified.

· Checked—Noise points will be reclassified. This is the default.

· Unchecked—Noise points will not be classified.

4.    Assign Withheld Flag (optional)

Indicates whether the withheld classification flag will be assigned to the noise points. This option is only enforced if the Edit Classification parameter is enabled.

· Checked—Noise points will have the withheld classification flag assigned.

· Unchecked—Noise points will not have the withheld classification flag assigned. This is the default.

5.    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.

6.    Output Feature Class (optional)

The output point features that represent the LAS points identified as noise.

7.    Ground (optional)

The ground surface used to define relative height.

8.    Minimum Height (optional)

The height that defines the lowest z-value threshold for identifying noise points. Any point that is lower than the specified value will be classified as noise. If a ground surface is specified, this threshold will be based on an offset from the ground such that a value of "-3 feet" means any points that are 3 feet below the ground surface will be classified as noise.

9.    Maximum Height (optional)

The height that defines the highest z-value threshold for identifying noise points. Any point that is higher than the specified value will be classified as noise. If a ground surface is provided, this threshold will be based on an offset from the ground such that a value of "250 meters" means any points that are higher than 250 meters above the ground surface will be classified as noise.

10. Neighborhood Point Limit (optional)

The maximum number of points inside the analysis volume that can be qualified as noise when using the Isolation method. If the analysis volume contains any number of LAS points that are equal to or less than this value, those points will be classified as noise.

11. Neighborhood Width (optional)

The size of each dimension in the XY space of the analysis volume when using the Isolation method.

12. Neighborhood Height (optional)

The height of the analysis volume when using the Isolation method.

13. Processing Extent (optional)

Specifies the extent of the data that will be evaluated by this tool.

14. Process entire LAS files that intersect extent (optional)

Specifies how the area of interest will be used in determining how LAS files will be processed. The area of interest is defined by the Processing Extent, the Processing Boundary , or a combination of both.

· Unchecked—Only LAS points that intersect the area of interest will be processed. This is the default.

· Checked—If any portion of a LAS file intersects the area of interest, all the points in that LAS file, including those outside the area of interest, will be processed.