WV-3854: Update Flood layer descriptions for recurring flood (#6269)

* Update Flood descriptions for recurring flood

* Update layer descriptions to include recurring flood

* Remove repeated text

Author: minniewong

config/default/common/config/metadata/layers/modis/combined/MODIS_Combined_Flood_2-Day.md

@@ -1,8 +1,14 @@
-The MODIS Near Real-Time (NRT) Global Flood Product (MCDWD) provides a daily global map of flooding. It is derived from the NRT MODIS Surface Reflectance (MOD09) datasets from both the Terra and Aqua satellites. The Flood Product is available for 3 compositing periods: 1-day, 2-day, and 3-day. For each composite, water detections for all observations (Terra and Aqua) over the compositing period (1, 2, or 3 days) are accumulated, and if the total exceeds the required threshold, the pixel is marked as water. (Note: 1-day product not yet available in Worldview)
+The MODIS Near Real-Time (NRT) Global Flood Product (MCDWD) provides a daily global map of flooding. It is derived from the NRT MODIS Surface Reflectance (MOD09) datasets from both the Terra and Aqua satellites.
 
-Users are advised to compare the flood product against the contributing MODIS reflectance imagery (such as 7-2-1 Corrected Reflectance; search for “721” after clicking “Add Layers”) , for the compositing period to ensure reported flood areas do not correspond to areas of cloud shadow. [Learn more...](https://www.earthdata.nasa.gov/data/instruments/modis/near-real-time-data/modis-nrt-flood-product#ed-flood-faq)
+The Flood Product is available for 3 compositing periods: 1-day, 2-day, and 3-day. For each composite, water detections for all observations (Terra and Aqua) over the compositing period are accumulated, and if the total exceeds the required threshold, the pixel is marked as water. These pixels are then classified as surface water (displayed in cyan in Worldview), recurring flood (yellow), or flood (red), based on separate reference water and recurring flood layers.
 
-As of January 12, 2023, a topographic filter has been applied to remove water detections from mountainous areas, greatly reducing the number of terrain shadow false-positives in such areas. These areas appear in all products as "Insufficient Data" (gray in default Worldview display).
+Note that recurring flood was only introduced with Release 1.1 in December 2025, and will not appear in earlier products (similar pixels will most likely be classified as flood in earlier products). The recurring flood class helps discriminate unusual flooding from recurring flooding, which is defined as flooding which has been observed in the same location in roughly 1/3 of the years in the reprocessed 22 year MODIS flood product archive (2003-2024). Please see [User Guide on the Product homepage](https://www.earthdata.nasa.gov/data/instruments/viirs/near-real-time-data/nrt-global-flood-products) for additional details.
+
+Note: The 1-day product not available in Worldview, but can be viewed in the [Flood Location Observation and Overview Dashboard (FLOOD) Viewer](https://lance.modaps.eosdis.nasa.gov/flood/). In the map interface, select "Advanced Mode".
+
+Users are advised to compare the flood product against the contributing MODIS reflectance imagery (such as 7-2-1 Corrected Reflectance; search for “721” after clicking “Add Layers”), for the compositing period to ensure reported flood areas do not correspond to areas of cloud shadow.
+
+On January 12, 2023, a topographic filter was added to remove water detections from mountainous areas, greatly reducing the number of terrain shadow false-positives in such areas. These areas appear in all products as "Insufficient Data" (gray in default Worldview display).
 
 #### Current Issues
 - Far west tiles (Hawaii, Alaska):  Due to issues with processing imagery around the international dateline for this product, far west tiles will sometimes appear with data at the start of the day, long before Terra or Aqua have observed for the day. Users are advised to disregard such data, until the Corrected Reflectance layers confirm current-day observations have been processed.
@@ -19,7 +25,7 @@ Common situations in which the flood product may be unable to accurately identif
 - Springtime snow melt ponding on fields: such water can appear as pixelated flood across flat areas of agricultural fields. Although this is unusual water, it is often very shallow, and not moving, and thus typically not a flood in the normal sense. Checking the reflectance imagery will typically show such areas on the edge of larger areas of snow extent, or, looking back in time, will show them recently covered by snow.
 
 #### Spatial Coverage
-Non-polar global land areas (below 80 degrees latitude), comprising 287 10x10 degree tiles (see [product homepage](https://www.earthdata.nasa.gov/data/instruments/modis/near-real-time-data/modis-nrt-flood-product) for map of included tiles).
+Non-polar global land areas (below 80 degrees latitude), comprising 287 10x10 degree tiles (see [product homepage](https://www.earthdata.nasa.gov/data/instruments/viirs/near-real-time-data/nrt-global-flood-products) for map of included tiles).
 
 #### Sensor/Image Resolution
 Nominal equatorial resolution is ~232 m per pixel, with resolution increasing toward the poles (~116 m at 60 degrees latitude). Note the higher apparent resolution towards the poles is simply an artifact of the lat/lon (geographic) projection used, and not intrinsic to the data.

config/default/common/config/metadata/layers/modis/combined/MODIS_Combined_Flood_3-Day.md

@@ -1,8 +1,14 @@
-The MODIS Near Real-Time (NRT) Global Flood Product (MCDWD) provides a daily global map of flooding. It is derived from the NRT MODIS Surface Reflectance (MOD09) datasets from both the Terra and Aqua satellites. The Flood Product is available for 3 compositing periods: 1-day, 2-day, and 3-day. For each composite, water detections for all observations (Terra and Aqua) over the compositing period (1, 2, or 3 days) are accumulated, and if the total exceeds the required threshold, the pixel is marked as water. (Note: 1-day product not yet available in Worldview)
+The MODIS Near Real-Time (NRT) Global Flood Product (MCDWD) provides a daily global map of flooding. It is derived from the NRT MODIS Surface Reflectance (MOD09) datasets from both the Terra and Aqua satellites.
 
-Users are advised to compare the flood product against the contributing MODIS reflectance imagery (such as 7-2-1 Corrected Reflectance; search for “721” after clicking “Add Layers”) , for the compositing period to ensure reported flood areas do not correspond to areas of cloud shadow. [Learn more...](https://www.earthdata.nasa.gov/data/instruments/modis/near-real-time-data/modis-nrt-flood-product#ed-flood-faq)
+The Flood Product is available for 3 compositing periods: 1-day, 2-day, and 3-day. For each composite, water detections for all observations (Terra and Aqua) over the compositing period are accumulated, and if the total exceeds the required threshold, the pixel is marked as water. These pixels are then classified as surface water (displayed in cyan in Worldview), recurring flood (yellow), or flood (red), based on separate reference water and recurring flood layers.
 
-As of January 12, 2023, a topographic filter has been applied to remove water detections from mountainous areas, greatly reducing the number of terrain shadow false-positives in such areas. These areas appear in all products as "Insufficient Data" (gray in default Worldview display).
+Note that recurring flood was only introduced with Release 1.1 in December 2025, and will not appear in earlier products (similar pixels will most likely be classified as flood in earlier products). The recurring flood class helps discriminate unusual flooding from recurring flooding, which is defined as flooding which has been observed in the same location in roughly 1/3 of the years in the reprocessed 22 year MODIS flood product archive (2003-2024). Please see [User Guide on the Product homepage](https://www.earthdata.nasa.gov/data/instruments/viirs/near-real-time-data/nrt-global-flood-products) for additional details.
+
+Note: The 1-day product not available in Worldview, but can be viewed in the [Flood Location Observation and Overview Dashboard (FLOOD) Viewer](https://lance.modaps.eosdis.nasa.gov/flood/). In the map interface, select "Advanced Mode".
+
+Users are advised to compare the flood product against the contributing MODIS reflectance imagery (such as 7-2-1 Corrected Reflectance; search for “721” after clicking “Add Layers”), for the compositing period to ensure reported flood areas do not correspond to areas of cloud shadow.
+
+On January 12, 2023, a topographic filter was added to remove water detections from mountainous areas, greatly reducing the number of terrain shadow false-positives in such areas. These areas appear in all products as "Insufficient Data" (gray in default Worldview display).
 
 #### Current Issues
 - Far west tiles (Hawaii, Alaska):  Due to issues with processing imagery around the international dateline for this product, far west tiles will sometimes appear with data at the start of the day, long before Terra or Aqua have observed for the day. Users are advised to disregard such data, until the Corrected Reflectance layers confirm current-day observations have been processed.
@@ -19,7 +25,7 @@ Common situations in which the flood product may be unable to accurately identif
 - Springtime snow melt ponding on fields: such water can appear as pixelated flood across flat areas of agricultural fields. Although this is unusual water, it is often very shallow, and not moving, and thus typically not a flood in the normal sense. Checking the reflectance imagery will typically show such areas on the edge of larger areas of snow extent, or, looking back in time, will show them recently covered by snow.
 
 #### Spatial Coverage
-Non-polar global land areas (below 80 degrees latitude), comprising 287 10x10 degree tiles (see [product homepage](https://www.earthdata.nasa.gov/data/instruments/modis/near-real-time-data/modis-nrt-flood-product) for map of included tiles).
+Non-polar global land areas (below 80 degrees latitude), comprising 287 10x10 degree tiles (see [product homepage](https://www.earthdata.nasa.gov/data/instruments/viirs/near-real-time-data/nrt-global-flood-products) for map of included tiles).
 
 #### Sensor/Image Resolution
 Nominal equatorial resolution is ~232 m per pixel, with resolution increasing toward the poles (~116 m at 60 degrees latitude). Note the higher apparent resolution towards the poles is simply an artifact of the lat/lon (geographic) projection used, and not intrinsic to the data.

config/default/common/config/metadata/layers/viirs/combined/VIIRS_Combined_Flood_2-Day.md

@@ -1,8 +1,12 @@
 The VIIRS Near Real-Time (NRT) Global Flood Product (VCDWD) provides a daily global map of flooding. It is derived from the NRT VIIRS Surface Reflectance (VJ109/VJ209) datasets from both the NOAA-20 and NOAA-21 satellites. Apart from the different source data, this product mirrors the MODIS Global Flood Product (MCDWD), which is also available in Worldview.
 
-The Flood Product is available for 3 compositing periods: 1-day, 2-day, and 3-day. For each composite, water detections for all observations (from both satellites) over the compositing period (1, 2, or 3 days) are accumulated, and if the total exceeds a required threshold, the pixel is marked as water. (Note: 1-day product not yet available in Worldview). The threshold varies by product; the User Guide provides details.
+The Flood Product is available for 3 compositing periods: 1-day, 2-day, and 3-day. For each composite, water detections for all observations (from both satellites) over the compositing period (1, 2, or 3 days) are accumulated, and if the total exceeds a required threshold, the pixel is marked as water. These pixels are then classified as surface water (displayed in cyan in Worldview), recurring flood (yellow), or flood (red), based on separate reference water and recurring flood layers.
 
-Users are advised to compare the flood product against the contributing VIIRS reflectance imagery (such as the false-color M11-I2-I1 Corrected Reflectance; search for “M11-I2-I1” after clicking “Add Layers”), for the compositing period to ensure reported flood areas do not correspond to areas of cloud shadow. [Learn more…](https://www.earthdata.nasa.gov/data/instruments/viirs/near-real-time-data/nrt-global-flood-products)
+Note that recurring flood was only introduced with Release 1.1 in December 2025, and will not appear in earlier products (similar pixels will most likely be classified as flood in earlier products). The recurring flood class helps discriminate unusual flooding from recurring flooding, which is defined as flooding which has been observed in the same location in roughly 1/3 of the years in the reprocessed 22 year MODIS flood product archive (2003-2024). Please see [User Guide](https://www.earthdata.nasa.gov/data/instruments/viirs/near-real-time-data/nrt-global-flood-products) for additional details.
+
+Note: The 1-day product not available in Worldview, but can be viewed in the [Flood Location Observation and Overview Dashboard (FLOOD) Viewer](https://lance.modaps.eosdis.nasa.gov/flood/). In the map interface, select "Advanced Mode".
+
+Users are advised to compare the flood product against the contributing VIIRS reflectance imagery (such as the false-color M11-I2-I1 Corrected Reflectance; search for “M11-I2-I1” after clicking “Add Layers”), for the compositing period to ensure reported flood areas do not correspond to areas of cloud shadow.
 
 A topographic filter is applied to remove water detections from areas that have sufficient topographic relief such that flood water would be unlikely to accumulate (e.g., mountainous areas), greatly reducing the number of terrain shadow false-positives. These areas appear in all products as "Insufficient Data" (gray in default Worldview display), which is also used to indicate when the clouds are blocking the view of the surface.
 

config/default/common/config/metadata/layers/viirs/combined/VIIRS_Combined_Flood_3-Day.md

@@ -1,8 +1,12 @@
 The VIIRS Near Real-Time (NRT) Global Flood Product (VCDWD) provides a daily global map of flooding. It is derived from the NRT VIIRS Surface Reflectance (VJ109/VJ209) datasets from both the NOAA-20 and NOAA-21 satellites. Apart from the different source data, this product mirrors the MODIS Global Flood Product (MCDWD), which is also available in Worldview.
 
-The Flood Product is available for 3 compositing periods: 1-day, 2-day, and 3-day. For each composite, water detections for all observations (from both satellites) over the compositing period (1, 2, or 3 days) are accumulated, and if the total exceeds a required threshold, the pixel is marked as water. (Note: 1-day product not yet available in Worldview). The threshold varies by product; the User Guide provides details.
+The Flood Product is available for 3 compositing periods: 1-day, 2-day, and 3-day. For each composite, water detections for all observations (from both satellites) over the compositing period (1, 2, or 3 days) are accumulated, and if the total exceeds a required threshold, the pixel is marked as water. These pixels are then classified as surface water (displayed in cyan in Worldview), recurring flood (yellow), or flood (red), based on separate reference water and recurring flood layers.
 
-Users are advised to compare the flood product against the contributing VIIRS reflectance imagery (such as the false-color M11-I2-I1 Corrected Reflectance; search for “M11-I2-I1” after clicking “Add Layers”), for the compositing period to ensure reported flood areas do not correspond to areas of cloud shadow. [Learn more…](https://www.earthdata.nasa.gov/data/instruments/viirs/near-real-time-data/nrt-global-flood-products)
+Note that recurring flood was only introduced with Release 1.1 in December 2025, and will not appear in earlier products (similar pixels will most likely be classified as flood in earlier products). The recurring flood class helps discriminate unusual flooding from recurring flooding, which is defined as flooding which has been observed in the same location in roughly 1/3 of the years in the reprocessed 22 year MODIS flood product archive (2003-2024). Please see [User Guide](https://www.earthdata.nasa.gov/data/instruments/viirs/near-real-time-data/nrt-global-flood-products) for additional details.
+
+Note: The 1-day product not available in Worldview, but can be viewed in the [Flood Location Observation and Overview Dashboard (FLOOD) Viewer](https://lance.modaps.eosdis.nasa.gov/flood/). In the map interface, select "Advanced Mode".
+
+Users are advised to compare the flood product against the contributing VIIRS reflectance imagery (such as the false-color M11-I2-I1 Corrected Reflectance; search for “M11-I2-I1” after clicking “Add Layers”), for the compositing period to ensure reported flood areas do not correspond to areas of cloud shadow.
 
 A topographic filter is applied to remove water detections from areas that have sufficient topographic relief such that flood water would be unlikely to accumulate (e.g., mountainous areas), greatly reducing the number of terrain shadow false-positives. These areas appear in all products as "Insufficient Data" (gray in default Worldview display), which is also used to indicate when the clouds are blocking the view of the surface.