THE CHANGE OF SCALE IN METHODOLOGIES OF FRAGILITY AND VULNERABILITY IN THE JUNDIAÍ RIVER BASIN/SP - DOI 10.5216/bgg.v34i3.33872

Abstract

This paper analyzes the change of scale in the methodologies of environmental fragility and natural vulnerability to soil loss in the Jundiaí river basin, SP. Four maps were generated, two of fragility and two of vulnerability, scales 1:50,000 and 1:250,000. The five classes of each methodology were equated, and their respective areas and percentages of overlap were confronted. It was noted the tendency of Crepani´s methodology to reduce the extreme values and accentuate the intermediate values, and of Ross to reduce the intermediate values and accentuate the extremes. It was observed that in both methods, the level of detail of classification´s areas was directly proportional to the scale of available cartographic bases. Thus, the greater the scale of thematic maps, the greater will be the difference between the maps of fragility and vulnerability. And, the smaller the scale of the maps, the greater should be your likeness.

Key words: scale, fragility, vulnerability.