MODAL ANALYSIS FOR THE REGIONALIZATION OF LOCAL LANDFORM DATA IN CENTRAL AMAZÔNIA SEDIMENTARY RELIEF

This paper describes a procedure to regionalize local landform information derived from SRTM for broad scale studies of the central Amazônia relief. Modal landforms of mapping units were assigned to terrain segments based on elevation data. Top landforms prevailed among first mode classes, and a second mode was then assigned, considering only the less frequent landforms related to fluvial incisions. The combinations of first and second modes were evaluated through detailed examinations of local DEM and landforms together with the available geological data. After regrouping the most associate classes, the final modal landform combination map showed the effectiveness of the method for regionalization landform data.