Statistic Individual Tree Attributes

Summary

This function is mainly used for attribute statistics and attribute extension on point clouds that have already been normalized and segmented into individual trees. It generates single tree attribute files, either by creating new files or updating existing ones.

Usage

Click ALS Forest > Statistic Individual Tree Attributes.

StatisticIndividualTreeAttribute

Parameters

The parameters are divided into two pages. The first page is for selecting the target files and the attributes to be counted, while the second page is for setting specific statistical parameters.

  • First Page
  • New File: Generates a new single tree attribute file. For the specific file format, refer to Individual Tree Segmentation Result File Format.
  • Update File: Updates an existing single tree attribute file. This is mutually exclusive with "New File." If the attribute file does not contain the selected attributes, they will be added.

  • Attribute Selection: At least one single tree attribute must be selected for statistics.

  • Second Page

  • Input Point Cloud: Select the point cloud to be counted, which must have been segmented into individual trees.

  • Height Above Ground: Only counts point clouds higher than this height.
  • Minimum Tree Height: Only counts individual trees with a height greater than this value.
  • Input DEM (optional): This option appears when "Elevation" is selected as a statistical item.
  • Input Slope (optional): This option appears when "Slope" is selected. The slope file is in tiff format. If a slope file is input, the slope at the tree location is obtained from the file and added as an extended attribute to the single tree attribute file.
  • Input Reference Point File: The reference point file is a comma-separated text file with two rows and three fields: X, Y, Radius. X and Y are the reference point positions, and Radius is the radius. If a reference point file is input, the azimuth and distance of trees within a certain radius from the reference point are calculated and added as extended attributes to the single tree attribute file.

The following table is an example of a reference point file:

X,Y,Radius
322716.24,4102494.69,15.0

The following table is an example of a single tree attribute file:

TreeID, TreeLocationX, TreeLocationY
1, 322716.24, 4102494.69
2, 322751.21, 4102499.9
3, 322519.35, 4102499.3

The following table is an example of a single tree attribute file with statistical data after inputting a reference point file (in CSV format):

TreeID, TreeLocationX, TreeLocationY, Azimuth, Distance
1, 322716.24, 4102494.69, 36.165, 8.982
2, 322751.21, 4102499.9, 41.282, 4.491
3, 322519.35, 4102499.3, 32.008, 4.708

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