3D Analyst Tools ArcToolbox

Classify LAS Building

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

Classify LAS Building

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

 

Classify LAS Building

Classifies building rooftops and sides in LAS data.

1.    Input LAS Dataset

The LAS dataset to be classified.

2.    Minimum Rooftop Height

The height from the ground that defines the lowest point from which rooftop points will be identified.

3.    Average Point Spacing (optional)

The average spacing of LAS points. This parameter is no longer used.

4.    Minimum Area

The smallest area of the building rooftop.

5.    Classification option (optional)

The classification method that will be used.

· AGGRESSIVE—Points that fit the planar rooftop characteristics with a relatively high tolerance for outliers will be detected. Consider using this method if the points are not well calibrated.

· STANDARD—Points that fit the planar rooftop characteristics with a relatively moderate tolerance for irregular points will be detected. This is the default

· CONSERVATIVE—Points that fit the planar rooftop characteristics with a relatively low tolerance for irregular points will be detected. Consider using this method if a lot of outlier points surround the building.

6.    Reuse existing building (optional)

Specifies whether the existing building classified points will be reused or reevaluated.

· Unchecked—Existing building classified points will be reevaluated to fit the criteria for plane detection, and points that do not fit the specified area and height will be assigned a value of 1. This is the default.

· Checked—Existing building classified points will contribute to plane detection process, but will not be reclassified in the event they do not meet the criteria specified in the tool's execution. Use this option if the existing classification is considered desirable.

7.    Is photogrammetric data (optional)

Specifies whether the points in the LAS file were derived using a photogrammetric technique.

· Unchecked—The points in the LAS file were obtained from a lidar survey, not from a photogrammetric technique for producing point clouds. This is the default.

· Checked—The points in the LAS file were obtained using a photogrammetric technique for producing point clouds from overlapping imagery.

8.    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.

9.    Classify above-roof points (optional)

Specifies whether points above the planes detected for the roof should be classified.

· Unchecked—Points above the planes detected by this tool will not be classified. This is the default.

· Checked—Points above the planes detected by this tool will be classified.

10. Maximum above-roof height (optional)

The maximum height of the points above the building rooftop that will be classified to the value designated in the Above Roof Class Code parameter.

11. Class code for above-roof points (optional)

The class code that will be assigned to points above the roof.

12. Processing Extent (optional)

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

13. Processing Boundary (optional)

A polygon feature that defines the area of interest to be processed 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.