dNBR Burn Severity

Compute differenced Normalized Burn Ratio (dNBR) from a pre-fire and post-fire scene pair, emit the scaled (×1000) dNBR raster, and classify pixels into the canonical MTBS / Key & Benson (2006) severity codes. Two input modes are supported: - `from-scenes` (default): inputs are pre/post multispectral scenes with NIR and SWIR2 bands. NBR is computed internally as `NBR = (NIR − SWIR2) / (NIR + SWIR2)` for each scene. - `from-nbr`: inputs are already-computed NBR rasters (e.g. chained from `imagery_radiometric_indices`). The op skips NBR computation and only differences and classifies. dNBR is emitted scaled by 1000 to match the MTBS convention (the same axis used by the `burn-severity` concept class table). The categorical severity raster is always produced as a secondary output.

ID	analysis_dnbr
Domain	geo
Category	analysis
Type	raster-raster-to-raster
Version	1.0.0

view yaml ◦view github ◦

Outputs

dnbr: raster · dNBR raster, scaled ×1000 to match the MTBS convention (`(NBR_pre − NBR_post) * 1000`). Typical range −2000 to +2000; MTBS class breaks reference this scaled axis.
severity: raster · Categorical MTBS burn-severity raster derived by applying `class_breaks` to the scaled dNBR. Codes follow `registry/concepts/burn-severity.yaml`: -1 = Increased greenness / regrowth (dNBR < -100) 1 = Unburned to low (-100 to +99) 2 = Low severity (+100 to +269) 3 = Moderate severity (+270 to +439) 4 = High severity (+440 to +659) 5 = Increased greenness (post-fire) (≥ +660) NoData is encoded as the int8 sentinel `-128`. int8 is used so the legal class code `-1` (regrowth) can be represented natively.

Parameters

mode: string · default from-scenes · Input variant. `from-scenes` computes NBR internally from the NIR and SWIR2 bands of `pre` and `post`. `from-nbr` assumes `pre` and `post` are single-band NBR rasters already in [-1, 1].
nir_band: string · default B8 · Band name (or numeric index as string) for NIR in the pre/post scenes. Defaults to Sentinel-2 `B8`. Use `B5` for Landsat 8/9 OLI, `nir` for the canonical Folia band alias, etc. Ignored when `mode: from-nbr`.
swir2_band: string · default B12 · Band name for SWIR2 in the pre/post scenes. Defaults to Sentinel-2 `B12`. Use `B7` for Landsat 8/9 OLI, `swir2` for the canonical Folia band alias. Ignored when `mode: from-nbr`.
class_breaks: object · default [object Object] · Override the MTBS class break thresholds (on the scaled ×1000 dNBR axis). Defaults match Key & Benson (2006) / MTBS canonical values referenced by `registry/concepts/burn-severity.yaml`.