Update README.md

README.md

@@ -35,9 +35,10 @@ This dataset provides flood detection data from satellite observations. Each geo
 1. **Parquet file** (post-processing.parquet): Contains detailed observations with timestamps, locations, and environmental metrics
 2. **80-meter buffer geotiff** (80m-buffer.tif): Filtered flood extent with 80m safety buffer
 3. **240-meter buffer geotiff** (240m-buffer.tif): Filtered flood extent with wider 240m safety buffer
+4. **Flood recurrence geotiff with 80-meter buffer** (recurrence-80m-buffer.tif): Number of distinct months with flooding detected.
 
 In the geotiffs:
-- **Value 2**: Pixels with flooding detected within the buffer distance (80m or 240m)
+- **Value 2**: Pixels with flooding detected within the buffer distance (80m or 240m). For the recurrence file, it is number of months with flooding minus 1. So 2=1 month of flooding, 3=2 months of flooding, etc.
 - **Value 1**: Default exclusion layer representing areas with potential false positives (rough terrain or arid regions) or false negatives (urban areas)
 - **Value 0**: Areas without any flood detection and outside of our exclusion mask