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

Metadata
Event: Tropical Storm Barry

Last Updated: July 23, 2019

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File: Tropical_Storm_Barry_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 Tropical Storm Barry. The study area consisted of portions of
Louisiana, Arkansas, and Mississippi, 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_20190704T001013_20190704T001038_027960_032833_FC1C.zip
S1A_IW_GRDH_1SDV_20190704T001038_20190704T001103_027960_032833_74EF.zip
S1A_IW_GRDH_1SDV_20190704T001103_20190704T001128_027960_032833_7C36.zip

Post-Flood Imagery Inputs Files:
S1A_IW_GRDH_1SDV_20190716T001014_20190716T001039_028135_032D7F_C493.zip
S1A_IW_GRDH_1SDV_20190716T001039_20190716T001104_028135_032D7F_4526.zip
S1A_IW_GRDH_1SDV_20190716T001104_20190716T001129_028135_032D7F_F0EF.zip
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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: Tropical_Storm_Barry_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 Tropical Storm Barry.
The report provides an overview of the raster data created 
with select zooms of affected cropland and pasture/hay. 

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