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  Conabio » Monitoring of ecosystems » Natural desaster case Hurricane Pauline » Multispectral Ratios
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BAND 3 RATIO OF NOVEMBER AND AUGUST IMAGES

After comparing all seven bands of each image, band 3 was considered to be the one with the best representation of vegetation and soil changes. Consequently, this band of the November and August images was used to calculate a ratio, i. e. a division between the bands; which enhances the differences between images from different dates.

Areas without vegetation appear in blue in the ratio image, highlighting accumulation areas mainly along riverbeds, where most changes occurred.

The sites presented as examples correspond to the following zones: a) Cerro Huatulco, in the upper part of Coyula River b) Manialtepec Lagoon c) Coyula River and Puerto Angel d) High part of Manialtepec River e) Chahue Bay

Note: Press the mouse button on any of the five images for a better resolution.

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