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The effects of two hurricanes (Katrina and Wilma) on protected mangroves insouthwest Florida and two hurricanes (Emily and Dean) on protected mangroves inthe Yucatan Peninsula were assessed paired sets of 20m multispectral SPOT and16-day 500m MODIS images. Normalized difference vegetation index (NDVI) andenhanced vegetation index (EVI) values were calculated to measure mangrovecanopy reflectance using three methods of analysis- 1) mangrove NDVI samplepoint extraction, 2) qualitative assessment of 500m MODIS NDVI and EVI timeseries, and 3) transects of NDVI differences before and after storm events.Results show each method effectively captures changes in mangrove canopiesconsistent with storm effects. However, the extent of damage to mangroves inSouth Florida and Sian Ka'an was highly variable. Hurricanes Wilma and Katrinaproduced a large drop in NDVI although NDVI values recovered within a year,suggesting remarkable resilience. Hurricane Emily apparently increased mangrovephotosynthetic activity owing to the location of landfall relative to the studyarea, the size of the wind field and the apparent lack of storm surge.Comparison of SPOT NDVI and MODIS NDVI values revealed that the changes pre-and post-storms were consistent at the different scales of observation.

Hurricane Effects on Mangrove Canopies Observed from MODIS and SPOT Imagery