The gully erosion presents spectral and spatial heterogeneity and altimetry variation. It is not a land use class, but an object and it can be mapped as a subclass, using OBIA. This study presents a methodology for delimitation of gullies in rural environments, based on image classification procedures. For such, two study areas were selected: one located in Minas Gerais, Brazil and another one ...

The tall-grass prairies, wetlands and forests that dominated the Iowa landscape have been replaced by annual row-crops and grass pastures that occupy more than 90 % of the landscape today. Because of these changes water reaches the streams and gullies much faster and has led to incised streams and an extensive growth of gully networks. Stream and gully banks are major contributors of the nonpoi...

This article describes the sampling design, survey methodology and findings of a natural resources survey conducted in the Rathbun Lake Watershed in Southern Iowa in 1999-2000. The goal of the survey was to quantify the erosion from all sources on agricultural lands and the ecological health of streams for each of 61 subwatersheds in the area. A total of 183 plots of approximately 160 acres in ...

This paper took a subregion in a small watershed gully system at Beiyanzikou catchment of Qixia, China, as a study and, using object-orientated image analysis (OBIA), extracted shoulder line of gullies from high spatial resolution digital orthophoto map (DOM) aerial photographs. Next, it proposed an accuracy assessment method based on the adjacent distance between the boundary classified by rem...

Gully erosion is known to affect soil productivity, and limit land use in many parts of the world. To assess susceptibility soils gully erosion, triggering factors must be analyzed. A simulation development over time was implemented Python – GIS modules based on topographic characteristics study area, properties, measured runoff. The results show that developed allow a successful data preparati...