DBH Inversion

Function Overview

DBH Inversion estimates tree DBH for one or more individual tree attribute files by using a generated DBH inversion model. The tool reads tree height and crown width from the individual tree attribute file, calculates inverted DBH with the formula and coefficients in the selected model, writes the result to the attribute file, and generates an HTML statistical report.

Usage

Click User Plugins > DBH Inversion to open the tool.

Steps

  1. Select one or more .treedb files for DBH inversion in Individual Tree Attribute File.
  2. Select an existing .dbhim model file in DBH Inversion Model.
  3. Set Output Path for the inversion statistical report.
  4. Click OK to start processing. The tool reads tree height and crown width fields from each individual tree attribute file and calculates inverted DBH.
  5. After processing, the inversion result is written to the original individual tree attribute file, and an HTML report is generated in the output path.

Parameter Settings

  • Individual Tree Attribute File: Input individual tree attribute file in .treedb format. The file must contain valid tree height and crown width attributes.

  • DBH Inversion Model: Input DBH inversion model file in .dbhim format. It can be generated by Generate DBH Inversion Model.

  • Output Path: Save location of the HTML statistical report. If a folder is specified, the report is automatically named DBHInversion_report_timestamp.html.

Output

  • Inverted DBH Field: The tool adds a field to the individual tree attribute file. The field name contains the inversion formula used, the unit is meter, and precision is 3 decimal places.

  • HTML Statistical Report: The report contains model information, fitting formula, model accuracy metrics, and statistics for each input file, including tree count, minimum DBH, maximum DBH, and average DBH.

Notes

  • Tree height and crown width in the input individual tree attribute file must be valid positive values. Otherwise, the corresponding records are not used for inversion.
  • The .dbhim model file should match the data attribute meanings. It is recommended to build the model from samples in the same region or similar stand type before inversion.
  • When multiple individual tree attribute files are processed, the tool writes inversion results one by one and summarizes statistics in the report.

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