Karenia brevis monthly bloom frequency maps on the West Florida Shelf

This dataset provides monthly frequency maps of Karenia brevis blooms (red tides) on the West Florida Shelf, 1978-1986, 2003-2024.

It integrates data from two satellite sensors:
- CZCS-derived maps: Covering 1978-1986, based on CZCS Nimbus-7 data
- MODIS-derived maps: Covering 2003-2019, based on MODIS Aqua data
- VIIRS-derived maps: Covering 2012-2014, based on VIIRS SNPP data

Two spatial resolutions are provided:
- 1 km resolution, geographic extent: 88.0°W to 81.0°W, 23.0°N to 31.0°N
- 0.1° resolution, geographic extent: 87.5°W to 81.0°W, 25.0°N to 30.5°N

File Formats:
- TIFF (.tif): Each file contains monthly bloom frequency values ranging from 0 to 1, indicating the proportion of days within the month when a bloom was detected at each pixel. Pixels with no valid observations are marked as NaN.
- PNG (.png): Visualization-ready images using a 'jet' colormap, where values from 0 to 1 are mapped to a color gradient (blue to red) for rapid visual inspection.

Each file name follows the format:
YYYY_MM_monthly_frequency_SENSOR_RESOLUTION.EXT
Where:
YYYY_MM = year and month of observation
SENSOR = MODIS or VIIRS
RESOLUTION = 1km or 0.1deg
EXT = file extension (.tif or .png)