PEDOMETRIA APOIADA EM ATRIBUTOS TOPOGRÁFICOS COM OPERAÇÕES DE TABULAÇÃO CRUZADA POR ÁLGEBRA DE MAPAS

Because soils show a strict relationship with relief, distributions of soil units can be inferred from topography analyses. Geoprocessing techniques can be used to create parametric relief representations from digital terrain models (DTMs), and these models can be used to calculate topographical attributes. The classic method of pedological cartography is onerous and time-consuming; as an alternative, pedometric techniques favor the recognition of preliminary mapping units. Making these attribute classes discrete and the further analysis with pre-existing maps from the study area, allowed us to understand the relationships between relief variables and the soil classes present. The last had a better relationship with the mapping units of pre-existing soils, so they were selected to be overlaid with GIS applications by means of the Cross-Tabulation method, which resulted in the identifi cation of soil preliminary units. Were delineated three preliminary soil classes in the basin in the fi rst hierarchical level of the SiBCS: Latosols, Cambisols, and Organosols+Gleissols. To validate the preliminary map derived were analyzed fi fty-three fi eld samples, and checking in loco. The predicted map were also compared to a conventional map of the Corvo stream’s basin, State of Parana, from which parameters were analyzed to show the quality of the maps: Kappa coeffi cient (K), Global Accuracy (GA), Error Matrix and accuracy from the producer’s and the user’s standpoints. The map classifi ed agrees in 69% of the area (K=0,43 e EG=0,69). The quality of the soil units classifi ed was satisfactory, based on the K and GE values from the comparison.