20260408 12531700 1.0 TRUE 150000000 5000 ItemDescription (EXERCISE - DaNCE March 2026) Normalized Difference Vegetation Index (NDVI) from PACE OCI for the Brazil Flood May 2024. <div style='text-align:Left;'><div><div><p><span style='font-weight:bold;'>Dates of Images:</span></p><p><span><span>Dates: 04/20/2024 (pre-flood), 05/06/2024, 05/07/2024, 05/09/2024, 05/15/2024, 05/21/2024 Time Zone: GMT (local crossing time of ~1:00 pm)</span></span></p><p><span style='font-weight:bold;'>Summary:</span></p><p><span><span>These are NDVI images from PACE OCI of the 2024 flooding in Brazil using data from the OCI LANDVI suite, where NDVI is one of the products delivered daily by the mission. The images show how the landscape changes from a pre-flood day (04/20/2024) through flood days ending at 05/21/2024 at ~1:00 pm local time. NDVI is a measure of approximate greenness and health in vegetation but can also be useful in distinguishing water extent and unhealthy vegetated areas, which can be see in these images throughout the flood.</span></span></p><p><span style='font-weight:bold;'>Suggested Use:</span></p><p><span><span>NDVI is a normalized band ratio measuring approximate greenness and vegetation health. Higher positive values mean greener and abundant vegetation, values around 0 mean bare soil or rock, and lower negative values mean non-vegetated areas like water or clouds. These images show the transition of the area around the Jacui River from non-flooded conditions (high NDVI values) to flooded (NDVI values in the negative, indicating water presence). Clouds have been screened from these products, so low NDVI values can around the river can be identified as water. </span></span></p><p><span style='font-weight:bold;'>Satellite/Sensor/Resolution:</span></p><p><span><span>Satellite: PACE, sensor: OCI, temporal resolution: daily, spatial resolution: gridded to 0.015 degrees from a Level 2 product in instrument swath (varying pixel size, 1.2 km at nadir).</span></span></p><p><span /></p></div></div></div> NASA PACE Team, POC: Skye Caplan. ex2602_pace_ndvi NDVI Normalized Difference Vegetation Index PACE Plankton Aerosol Cloud ocean Ecosystem PACE OCI Brazil NASA NASA Disasters <div style='text-align:Left;'><div><div><p><span>NASA data and products are freely available to federal, state, public, non-profit and commercial users. This information can be experimental- or research-grade data products and may not be appropriate for operational use. These NASA data products, services, and the Disasters Mapping Portal are intended to aid decision makers and enhance situational awareness, but these data are not guaranteed to be consistently available or routinely updated.</span></p></div></div></div> 20260408