This work presents a methodology for Landscape Topographic Units (LTU) mapping to be applied in tree species potential habitat modeling. LTU were determined as homogeneous units regarding Altitude, Aspect and Terrain Position. The study area is located in Vale do Paraíba Region in São Paulo State, Brazil, corresponding to IBGE Tremembé map sheet (1:50 000; SF-23-Y-B-V-4). Input data are 20m contour lines with VIPs and drainage network. Geographical analysis was conducted within ARC/INFO 7.0.2 environment. A triangular irregular network (TIN) was generated from the contour lines, using VIPs and drainage network as break lines. TIN was converted into gridded digital elevation model (DEM) from which Slope and Aspect maps were derived. DEM was stratified into 200 m Altitude classes, represented in the Altitude map (classes from 500 m to 1900 m). Aspect map was stratified into four classes centered at the cardinal directions. The procedure to generate Terrain Position map involved first the stratification of Slope map into two classes: < 5° and > 5°. A 30 meters buffer was established along the drainage network which was then intersected to the stratified Slope map with the following rule: areas with < 5° slope and intersecting drainage buffer are attributed to Bottomland class; areas with < 5° slope which do not intersect drainage buffer are attributed to Hilltop class. Areas with > 5° slope were further stratified into terrain curvature classes by the application of CURVATURE function to the DEM, which discriminated Concave and Flat (curvature < 0) and Convex (curvature > 0) classes. The intersection among Altitude, Aspect and Terrain Position maps yielded LTU map, which will be used as proxy information for habitat variables such as temperature and irradiance (Altitude and Aspect), soil hydric characteristics and erosive processes (Terrain Position) which are relevant for tree species colonization and survival.