From 481a781bc2489e790f14a340613072c0d9ace28d Mon Sep 17 00:00:00 2001
From: David Hoese <david.hoese@ssec.wisc.edu>
Date: Tue, 12 Sep 2023 12:55:26 -0500
Subject: [PATCH] Add normalized burn ratio composite (nbr) for VIIRS

---
 etc/composites/viirs.yaml   | 15 +++++++++++++++
 etc/enhancements/viirs.yaml |  8 ++++++++
 2 files changed, 23 insertions(+)

diff --git a/etc/composites/viirs.yaml b/etc/composites/viirs.yaml
index 41083f45..e14f5bd9 100644
--- a/etc/composites/viirs.yaml
+++ b/etc/composites/viirs.yaml
@@ -318,3 +318,18 @@ composites:
     standard_name: equalized_radiance
     units: "1"
     saturation_correction: true
+
+  nbr:
+    compositor: !!python/name:satpy.composites.viirs.GenericCompositor
+    prerequisites:
+      - compositor: !!python/name:satpy.composites.RatioCompositor
+        prerequisites:
+          - compositor: !!python/name:satpy.composites.DifferenceCompositor
+            prerequisites:
+              - name: M11
+              - name: M07
+          - compositor: !!python/name:satpy.composites.SumCompositor
+            prerequisites:
+              - name: M11
+              - name: M07
+    standard_name: normalized_burn_ratio
diff --git a/etc/enhancements/viirs.yaml b/etc/enhancements/viirs.yaml
index eb7e1314..72a3ac4f 100644
--- a/etc/enhancements/viirs.yaml
+++ b/etc/enhancements/viirs.yaml
@@ -166,3 +166,11 @@ enhancements:
             - filename: colormaps/abi_l2_modified_cloud_top.cmap
               min_value: 300
               max_value: 200
+
+  nbr:
+    sensor: viirs
+    standard_name: normalized_burn_ratio
+    operations:
+      - name: linear_stretch
+        method: !!python/name:satpy.enhancements.stretch
+        kwargs: { stretch: 'crude', min_stretch: -1.0, max_stretch: 1.0 }