Tree Density 1:25,000 - Vicmap Vegetation

A presence/absence tree cover dataset is derived from SPOT Panchromatic imagery (10m pixels) by a combination of digital classification and visual interpretation . The presence/absence dataset is then grouped into three density classes (Dense, Medium, Scattered) by neighbourhood and proximity cell based analysis. The raster dataset is converted to vector as a final step.

The process of grouping tree cover into density classes simplifies the representation of trees and reduces the complexity of the vector dataset. It is a particularly neat way of representing scattered tree cover. The original, ungrouped raster dataset is maintained as a separate dataset.

Classifying SPOT Panchromatic imagery for vegetation can be limiting as the panchromatic image only encompasses a small portion of the infrared part of the electromagnetic spectrum. However, the image sharpness and detail offered makes the trade off between spectral range and spatial resolution worth while for mapping tree cover at 1:25,000.

Tree cover is defined as woody vegetation greater than 2 metres in height and with a crown cover (foliar density) greater than 10 percent.

Data and Resources

Additional Information

Field Value
Created (Data asset) 29/06/2019
Last updated 29/11/2021
Organisation Department of Environment, Land, Water & Planning
License Creative Commons Attribution 4.0 International