Slope softening due to imagery resolution in geographic information systems

Revista Brasileira de Engenharia Agrícola e Ambiental

Cavalli, Antonio Carlos¹  Valeriano, Márcio de Morisson¹ 

[1] Instituto Agronômico de Campinas, Campinas

关键词: slope;    imagery;    geographic information system;    watershed;    accuracy    INTRODUÇÃO Os levantamentos e estimativas atuais apontam para uma perda crescente no potencial de utilização dos recursos hídricos e de solos devidos;    em grande parte;    à erosão hídrica (pela chuva) de solos agrícolas;   

DOI  :  10.1590/S1415-43662000000200028

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

This paper presents a methodology to minimize the slope softening effect caused by pixel variations in the Digital Elevation Model (DEM) interpolation used in Geographic Information Systems. The studied area is part of Rio Piracicaba (São Paulo State, Brazil) watershed, located in a very steep site in order to point out the high variability slope aspects of the region. Slope maps with 100, 125, 200 and 250 m pixels were produced. Transects were overlayed on them to provide data for correlation analysis. The method confirmed the high variability among the slope maps. Furthermore, alternatives to avoid the slope softening effect and data precision losses were established.

【 授权许可】

CC BY-NC