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

Metadata
Event: Midwest Floods - Late June 2024 (Assessment Period)

Last Updated: July 9, 2024

-------------------------------------------------------------------------

Report File Name: Midwest_Flood_2024_Disaster Assessment.pdf

Description: During late June 2024, heavy rainfall across northwest Iowa, southwest Minnesota, and southeast South Dakota from June 20-22 resulted in rainfall totals exceeding 2 inches in most areas with widespread totals ranging from 5-10 inches. Some locations in southeast South Dakota and northwest Iowa reported 10-20 inches of rainfall. The event resulted in flash flooding, with record flooding observed at several river points and widespread, devastating floods in towns adjacent to rivers. The United States Department of Agriculture's National Agricultural Statistics Service (NASS) produced an assessment on the extent of potential damage to agricultural land and activities from this event. A disaster assessment was conducted using available Sentinel-1 Synthetic Aperture Radar (SAR) and cloud-free Sentinel-2 Multi-Spectral Instrument (MSI) imagery coverage to identify likely inundated areas by the flooding events in late June 2024. Inundated areas were then compared to the 2023 Cropland Data Layer (CDL) to estimate crops potentially affected by the floods.

--------------------

Imagery Inputs

Name: Sentinel-2 Multi-Spectral Instrucment (MSI)
Sentinel-2 MSI Median Composite Image (June 1 – July 2, 2023) and Sentinel-2 MSI Median Composite Image (June 17 – June 30, 2024)
Obtained and Derived From: Sentinel-2 MSI: MultiSpectral Instrument, Level-2A collection - https://developers.google.com/earth-engine/datasets/catalog/COPERNICUS_S2_SR

Name: SENTINEL-1 Synthetic Aperture Radar (SAR)
Sentinel-1 SAR Image (June 17, 2024) and Sentinel-1 SAR (July 1, 2024)
Obtained and Derived From: Sentinel-1 SAR GRD: C-band Synthetic Aperture Radar Ground Range Detected, log scaling - https://developers.google.com/earth-engine/datasets/catalog/COPERNICUS_S1_GRD

--------------------

Agricultural Inputs

Name: NASS 2023 Cropland Data Layer (planted acres)
Obtained From: Google Earth Engine
Website: https://developers.google.com/earth-engine/datasets/catalog/USDA_NASS_CDL
Disclaimer: These data are not official NASS estimates. 

Processing Software

Google Earth Engine
ArcGIS Pro 3.1

--------------------