Identification of severely eroded soils from remote sensing data tested in Risnovce and Levice pilot areas
1998
Fulajtar, M. Jr
Highly eroded relatively infertile soils are common in hilly agricultural areas of Slovakia. Detail soil map that identifies these eroded soils is needed for land management, land use planning, land evaluation and for the determination of taxes and commercial land prices. An attempts to map these soils done several decades ago using existing technology brought an inadequate results. With the introduction of remote sensing to the market new opportunities came to develop improved resources planning and assessment tools. This paper describes a methodological study comparing different approaches to identification of eroded soils from both aerial photos and satellite images. Erosion patterns were detected from aerial photos and satellite images in several ways. Analogue interpretation of aerial photos was done in two ways. The simplest approach is hand drawing directly from earial photos onto transparent sheets. More exact approach is vectorizing the erosion pattern by computer from the scanned and georeferenced earial photos mounted to a photomosaic. The satellite image was interpreted by analogue method vectorizing the erosion pattern on the screen, and by digital method based on mathematical classification. The results of this study showed that the eroded soils can be mapped from both the aerial photos and the satellite images. The accuracy of the resulting maps is much better than the accuracy of maps done by field survey
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