Information of the green microalgae bloom extracted from different satellite images may show noticeable difference,which is commonly attributed to the various spatial resolutions,bands configuration and the overpass time differences between the earth-observing sensors.But the dedicated research exploring these factors has not been widely performed and the underlying mechanism has not been well documented.In this paper,we aims at quantify the impact of spatial resolution of satellite image on the extracted information of green macroalgae bloom (GMB).Four MERIS full and reduced resolution (300 m and 1 200 m)images are adopted,which have the same bands and overpass time with the only difference in their spatial resolutions.GMB are extracted from these images with the same method of NDVI algo-rithm.The covered area and the distribution concentration (characterized by the macroalgae patch number and aggrega-tion index)of GMB are analyzed.The results indicate that the influence of spatial resolution on the satellite derived GMB area is significant.The relative percentage difference in the extracted GMB area from MERIS full and reduced reso-lution images can be up to 67%,depending on the NDVI threshold and possibly also on development phase of the bloom.Similar trend is also found for the extracted patch distribution concentration of GMB.The patch number and ag-gregation index derived from full-resolution MERIS images are about 7 ~21 times and 15% ~25% higher than those from reduced MERIS images,respectively.
green microalgae bloomMERISspatial resolutioncovered areaconcentration
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