clean up tree cover loss logic and comment

wri · Nov 1, 2024 · 32857c6 · 32857c6
1 parent 78af193
commit 32857c6
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Showing 2 changed files with 7 additions and 9 deletions.
diff --git a/app/routes/titiler/algorithms/alerts.py b/app/routes/titiler/algorithms/alerts.py
@@ -18,7 +18,6 @@ class Alerts(BaseAlgorithm):
     title: str = "Deforestation Alerts"
     description: str = "Decode and visualize alerts"
 
-
     conf_colors: OrderedDict = OrderedDict(
         {
             IntegratedAlertConfidence.low: AlertConfig(
@@ -33,7 +32,6 @@ class Alerts(BaseAlgorithm):
         }
     )
 
-
     record_start_date: str = "2014-12-31"
 
     start_date: Optional[str] = None

diff --git a/app/routes/titiler/algorithms/dist_alerts.py b/app/routes/titiler/algorithms/dist_alerts.py
@@ -52,13 +52,13 @@ def create_mask(self):
             )
 
         if self.tree_cover_loss_mask:
-            # Tree cover loss before 2020 can't be used to filter out pixels as not forest
-            # if they had tree cover loss. Instead we use tree cover height taken that year
-            # is used as source of truth.
+            # Tree cover loss data before 2020 can't be used to filter out pixels as not forest
+            # if they had tree cover loss. Instead, we use tree cover height taken that
+            # year as source of truth. For example, if a pixel had tree cover loss on
+            # 2018, but has tree cover height (2020) that meets the forest threshold, the pixel meets
+            # the forest criteria for alerts.
             mask *= (
-                (self.tree_cover_loss_data.array[0, :, :] >= self.tree_cover_loss_mask)
-                | (self.tree_cover_loss_data.array[0, :, :] == 0)
-                | (self.tree_cover_loss_data.array[0, :, :] <= 2020)
-            )
+                self.tree_cover_loss_data.array[0, :, :] >= self.tree_cover_loss_mask
+            ) | (self.tree_cover_loss_data.array[0, :, :] <= 2020)
 
         return mask