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  Conabio » Monitoring of ecosystems » Natural desaster case Hurricane Pauline » Image taken on August
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USE OF LANDSAT TM IMAGES

INFORMATION AND LOCATION

For this analysis, we used a satellite image of the TM (Thematic Mapper) sensor of the Landsat satellite of August 14th provided by EOSAT (Earth Observation Satellite Company); the digital information was provided by ASERCA (Acuerdo Para la Adquisición y Manejo Confidencial de datos de Satélite).

This image covers the southern region of Oaxaca, from 97º21' to 95º45' West longitude and from 15º37' to 16º52' North latitude, and was captured in August, two months before the occurrence of the hurricane.

For the image rectification process, we had to transform the SOM (Space Oblique Mercator) projection to a Lambert Conformal Conic projection, including the use of the digital elevation model.

IMAGE OVER A DIGITAL ELEVATION MODEL

In order to obtain all information provided by this image with respect to the main relief, we combined the aforementioned image with the digital elevation model.

As you can see in this image, the Sierra de Miahuatlán acts as an obstacle limiting those basins used to define the zone of influence of Hurricane Pauline. This sierra acts as a natural barrier preventing humid winds from the sea from passing through, resulting in higher precipitations in high elevation zones; this may also affect erosive processes in that zone.

This image illustrates the high percentage of clouds in the elevated areas within the coverage area, like the Sierra de Miahuatlán (in white).

We used a green color to represent areas covered by vegetation, while blue and gray colors represent areas without vegetation, or crop lands.

Oppress to see the image with more resolution

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