Earth Data School
About
Full catalog/ida-ndwi-difference
ida-ndwi-difference·dataset

Hurricane Ida Flooding-Change Map, Louisiana

NDWI Difference for Pre and Post-Hurricane Ida from PlanetScope
atmosphere NASA VEDA COG
In plain English

What it measures. A before-and-after comparison of surface water across southern Louisiana, revealing new flooding left by Hurricane Ida.

How it's made. Made from PlanetScope commercial satellite imagery, comparing a water-detection index before and after the storm.

How & where you'd use it. Helps responders map where floodwaters spread to focus rescue and recovery.

What's measured

idandwidifference

Coverage & cadence

  • Time span2021-08-23 → 2021-09-09
  • Spatial extent-90.864, 29.016, -90.045, 29.663
  • FormatsCOG

What you can do with it

  • Map air pollutants — NO₂, aerosols, ozone
  • Track greenhouse gases and Earth's energy budget
  • Feed weather and air-quality analysis
Official description

Normalized Difference Water Index Difference of before and after Hurricane Ida in Southern Louisiana.

Get the data

veda_access.py
# NASA VEDA — open STAC API, anonymous (cloud-optimized GeoTIFFs)
from pystac_client import Client

cat = Client.open("https://openveda.cloud/api/stac")
col = cat.get_collection("ida-ndwi-difference")
items = list(col.get_items())          # browse the analysis-ready COGs
# open an asset with rioxarray:
# import rioxarray; da = rioxarray.open_rasterio(items[0].assets["cog_default"].href)
NASA VEDA is an open STAC catalog — browse and stream the cloud-optimized GeoTIFFs anonymously (no login).