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test/Proof_of_Concept__April_SWX (MapServer)

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Service Description:
Date of Image(s)

Post-Event: April 7, 2025

Infrastructure data was extracted in early May 2025.

Date of Next Image 

None planned

Summary

Floodwater is derived from Visible Infrared Imaging Radiometer Suite (VIIRS) instrument onboard NASA and NOAA Suomi National Polar-orbiting Partnership (Suomi NPP) satellite.

VIIRS floodwater product was produced by NASA SatCORPS Ground Station Observation Network (GSON) low latency system. More information can be found here.

The image (Flood Polygons layer) shows where floodwater was detected from the VIIRS observation as a fraction percentage. The Flood Polygons layer was used to identify administrative areas, structures, and critical infrastructure that may be a risk of flooding after an event. This test case used the VIIRS Flood product for the Severe Weather in April 2025.

Suggested Use

The map shows the floodwater fraction percentage (1-100%) that contains water. Floodwater fraction values (color map 101-200) are isolated and converted to polygons (Flood Polygons layer).

Processed layer - Areas of Interest: Each polygon in the administrative boundary is intersected with the vectorized flood fraction product. The symbolized output indicates the percentage of area as a fraction of total administrative boundary area that intersects with a pixel in the flood fraction product at certain thresholds (if applicable), described in the legend.

Processed layer - Critical Infrastructure: A 375m buffer (equal to the flood model resolution) was created around each point and intersected with the vectorized flood fraction product. The symbolized output indicates if the buffer corresponded with a flooded pixel, serving as a potential signal for exposed infrastructure. Unexposed infrastructure in the AOI is retained.

Processed layer - USA Structures: Each structure was intersected with the vectorized flood fraction product. The symbolized output indicates if the buffer corresponded with a flooded pixel, serving as a potential signal for exposed infrastructure. Unexposed infrastructure in the AOI is retained.

Processed layer - Roads: A 375m buffer (equal to the flood model resolution) was created around each line in the roads database. Each segment of road that intersected a flooded pixel was grouped and dissolved to flag road segments potentially at risk.

Satellite/Sensor:

VIIRS instrument onboard SNPP Satellite Generated using CSPP v4.1.

Resolution:

375 meters

Credits:

Flood Product Information:
NASA Langley SatCORPS: https://satcorps.larc.nasa.gov/new/
NOAA Joint Polar Satellite System (JPSS) VIIRS Data:https://registry.opendata.aws/noaa-jpss/
Additional information on VIIRS Flooding products:  https://disasters-geoplatform.hub.arcgis.com/pages/viirs-floodwater-fraction-map

Added Value and Infrastructure Information:
Geospatial processing over infrastructure and administrative areas performed by the DRCO (drcs@nasa.gov).
Infrastructure data was gathered from HIFLD Open, with original data sources including the U.S. Army Corps of Engineers (National Inventory of Dams), Federal Highway Administration (Roads, the National Bridge Inventory), and various state and local sources (hospitals). 
Structure data was gathered from the Federal Emergency Management Agency (FEMA) Structures database.
Administrative boundaries were collected from the U.S. Census Bureau's TIGER/Line Shapefiles.

Esri REST Endpoint:

See URL section on right side of page.



Map Name: April SWX Added Value VIIRS Flood

Legend

All Layers and Tables

Dynamic Legend

Dynamic All Layers

Layers: Description: Date of Image(s)Post-Event: April 7, 2025Infrastructure data was extracted in early May 2025.Date of Next Image None plannedSummaryFloodwater is derived from Visible Infrared Imaging Radiometer Suite (VIIRS) instrument onboard NASA and NOAA Suomi National Polar-orbiting Partnership (Suomi NPP) satellite.VIIRS floodwater product was produced by NASA SatCORPS Ground Station Observation Network (GSON) low latency system. More information can be found here.The image (Flood Polygons layer) shows where floodwater was detected from the VIIRS observation as a fraction percentage. The Flood Polygons layer was used to identify administrative areas, structures, and critical infrastructure that may be a risk of flooding after an event. This test case used the VIIRS Flood product for the Severe Weather in April 2025.Suggested UseThe map shows the floodwater fraction percentage (1-100%) that contains water. Floodwater fraction values (color map 101-200) are isolated and converted to polygons (Flood Polygons layer).Processed layer - Areas of Interest: Each polygon in the administrative boundary is intersected with the vectorized flood fraction product. The symbolized output indicates the percentage of area as a fraction of total administrative boundary area that intersects with a pixel in the flood fraction product at certain thresholds (if applicable), described in the legend.Processed layer - Critical Infrastructure: A 375m buffer (equal to the flood model resolution) was created around each point and intersected with the vectorized flood fraction product. The symbolized output indicates if the buffer corresponded with a flooded pixel, serving as a potential signal for exposed infrastructure. Unexposed infrastructure in the AOI is retained.Processed layer - USA Structures: Each structure was intersected with the vectorized flood fraction product. The symbolized output indicates if the buffer corresponded with a flooded pixel, serving as a potential signal for exposed infrastructure. Unexposed infrastructure in the AOI is retained.Processed layer - Roads: A 375m buffer (equal to the flood model resolution) was created around each line in the roads database. Each segment of road that intersected a flooded pixel was grouped and dissolved to flag road segments potentially at risk.Satellite/Sensor:VIIRS instrument onboard SNPP Satellite Generated using CSPP v4.1.Resolution:375 metersCredits:Flood Product Information:NASA Langley SatCORPS: https://satcorps.larc.nasa.gov/new/NOAA Joint Polar Satellite System (JPSS) VIIRS Data:https://registry.opendata.aws/noaa-jpss/Additional information on VIIRS Flooding products:  https://disasters-geoplatform.hub.arcgis.com/pages/viirs-floodwater-fraction-mapAdded Value and Infrastructure Information:Geospatial processing over infrastructure and administrative areas performed by the DRCO (drcs@nasa.gov).Infrastructure data was gathered from HIFLD Open, with original data sources including the U.S. Army Corps of Engineers (National Inventory of Dams), Federal Highway Administration (Roads, the National Bridge Inventory), and various state and local sources (hospitals). Structure data was gathered from the Federal Emergency Management Agency (FEMA) Structures database.Administrative boundaries were collected from the U.S. Census Bureau's TIGER/Line Shapefiles.Esri REST Endpoint:See URL section on right side of page.

Service Item Id: 675c80d701dd47faadee2e888f863a55

Copyright Text: NASA LaRC, SatCORPS; VIIRS; USACE; FEMA; FHWA; ORNL; HIFLD. Processing by NASA Disasters.

Spatial Reference: 4326  (4326)


Single Fused Map Cache: false

Initial Extent: Full Extent: Units: esriDecimalDegrees

Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP

Document Info: Supports Dynamic Layers: true

MaxRecordCount: 2000

MaxImageHeight: 4096

MaxImageWidth: 4096

Supported Query Formats: JSON, geoJSON, PBF

Supports Query Data Elements: true

Min Scale: 0

Max Scale: 0

Supports Datum Transformation: true



Child Resources:   Info   Dynamic Layer

Supported Operations:   Export Map   Identify   QueryLegends   QueryDomains   Find   Return Updates