USDA/NASS Disaster Analysis Web Page
https://www.nass.usda.gov/Research_and_Science/Disaster-Analysis/index.php

Metadata
Event: Hurricane Dorian

Last Updated: September 13, 2019

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File: Hurricane_Dorian_Inundation_Layer.zip

Description: This dataset is a 2019 inundation raster layer created to 
estimate the extent of cropland and pasture/hay inundated by flooding 
from Hurricane Dorian. The study area consisted of portions of Georgia, 
South Carolina, North carolina, and Virginia, United States of America.
Data represent cropland, inundated cropland,pasture/hay, inundated
pasture/hay, water bodies, and other land.

Projection: Albers Conical Equal Area

Spatial Resolution: 30 meter

Attribute Table

Value	Class_Name
1	Water
2	Other
10	Cropland
11	Inundated Cropland
20	Pasture Hay
21	Inundated Pasture Hay

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Imagery Inputs

Sentinel-1A Data: interferometric wide (IW) swath (250 kilometer),
Level-1 Ground Range Detected (GRD), 5x20 meter spatial resolution, and 
dual polarization (VV, VH)

Imagery Download: Alaskan Satellite Facility 
https://vertex.daac.asf.alaska.edu/

Pre-Flood Imagery Input Files:
S1A_IW_GRDH_1SDV_20190821T231355_20190821T231420_028674_033ECD_EE05
S1A_IW_GRDH_1SDV_20190821T231420_20190821T231445_028674_033ECD_84BD
S1A_IW_GRDH_1SDV_20190826T232145_20190826T232210_028747_03414D_4BE3
S1A_IW_GRDH_1SDV_20190826T232210_20190826T232235_028747_03414D_E8CE
S1A_IW_GRDH_1SDV_20190828T230558_20190828T230623_028776_034258_7F98
S1A_IW_GRDH_1SDV_20190828T230623_20190828T230648_028776_034258_87B0

Post-Flood Imagery Inputs Files:
S1A_IW_GRDH_1SDV_20190907T232146_20190907T232211_028922_034766_0502
S1A_IW_GRDH_1SDV_20190907T232211_20190907T232236_028922_034766_9FC7
S1B_IW_GRDH_1SDV_20190908T231310_20190908T231335_017953_021CC3_B814
S1B_IW_GRDH_1SDV_20190908T231335_20190908T231400_017953_021CC3_4DDD
S1A_IW_GRDH_1SDV_20190909T230559_20190909T230624_028951_03486B_78EB
S1A_IW_GRDH_1SDV_20190909T230624_20190909T230649_028951_03486B_0D98
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Land Cover Inputs

NASS 2018 Cultivated Layer (planted acres)
Obtained From: https://www.nass.usda.gov/Research_and_Science/Cropland/Release/index.php

NASS 2018 Cropland Data Layer (planted acres)
Obtained From: CropScape: https://nassgeodata.gmu.edu/CropScape/

Disclaimer: These data are not official NASS estimates. 

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Processing Software

Sentinel Application Platform (SNAP) Toolbox 6.0
http://step.esa.int/main/download/

Hexagon ERDAS Imagine 2016
http://www.hexagongeospatial.com/

Esri ArcGIS 10.3.1
http://www.esri.com/

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Methodology

Boryan, C., Z. Yang, A. Sandborn, P. Willis, and B. Haack (2018). 
Operational Agricultural Flood Monitoring With Sentinel-1 Synthetic 
Aperature Radar. IGARSS 2018, Valencia Spain, July 22-27, 2018. Posted 
08/09/2018
https://www.nass.usda.gov/Research_and_Science/Cropland/docs/Boryan_IGARSS2018%20_Flood.pdf

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File: Hurricane_Dorian_Flood_Assessment_Report.pdf

Description: The assessment report provides a brief overview of the 
disaster event and the analysis that USDA/NASS conducted to estimate the 
extent of cropland and pasture/hay inundated by flooding from Hurricane
Dorian. The report provides an overview of the raster data created 
with select zooms of affected cropland and pasture/hay. 

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Disclaimer

There are several causes for anomalous water, which could include 
flooding, saturated fields from rainfall, ponding, or intentionally 
flooded rice and aquaculture fields.