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Table 1 Composite burn index (CBI) and relative differenced normalized burn ratio (RdNBR) values for each severity category.

From: Relating Fire-Caused Change in Forest Structure to Remotely Sensed Estimates of Fire Severity

Severity category

CBI

Initial RdNBR

Extended RdNBR

Unchanged

0.00 to 0.10

<79

<69

Low

0.10 to 1.24

79 to 360

69 to 315

Moderate

4.25 to 2.24

361 to 732

316 to 640

High

2.25 to 3.0

≥733

≥641