หน้า1/8
หน้า 1 จาก 8TauDEM Terrain analysis using Digital Elevation Models หน้า 1 จาก 8
หน้า 2 จาก 8What is TauDEM? TauDEM (Terrain analysis using Digital Elevation Models) is a set of Digital Elevation Model (DEM) analysis tools developed by David Tarboton and students and colleagues in his group over the years with support from a variety of sponsors, whose support is gratefully acknowledged. These tools are targeted at extraction of information useful for hydrologic modeling and analysis from DEMs. หน้า 2 จาก 8
หน้า 3 จาก 8The TauDEM Toolbox capabilities Pit removal by flooding to ensure hydraulic connectivity within the watershed. Computation of flow directions and slopes using single and multiple flow direction methods. Contributing area using single and multiple flow direction methods. Multiple methods for the delineation of channel networks including geomorphology-based methods sensitive to spatially variable drainage density. Objective methods for determination of the channel network delineation threshold based on stream drop analysis. Delineation of watersheds and subwatersheds draining to each stream segment and association between watershed and segment attributes for setting up hydrologic models. หน้า 3 จาก 8
หน้า 4 จาก 8Specialized functions for terrain analysis Slope over specific catchment area ratio which is the inverse of the wetness index. Distances down to streams and up to ridges along flow directions measured horizontally, vertically, in a straight line, or following the topographic profile. Upslope dependence function to map the locations upslope where activities have an effect on a downslope location. Decaying accumulation that evaluates upslope contribution subject to decay or attenuation. Concentration limited accumulation. Transport limited accumulation. Reverse accumulation. Avalanche runout. Average slope หน้า 4 จาก 8
หน้า 5 จาก 8TauDEM flow direction calculation หน้า 5 จาก 8
หน้า 6 จาก 8TauDEM flow direction calculation The slope and flow direction associated with the grid cell is taken as the magnitude and direction of the steepest downslope vector from all eight facets. This is implemented using equations given in Tarboton (1997) In the case where no slope vectors are positive (downslope), the flow direction is set using the method of Garbrecht and Martz (1997) for the determination of flow across flat areas (D8). หน้า 6 จาก 8
หน้า 7 จาก 8Calculation of Flow Directions หน้า 7 จาก 8
หน้า 8 จาก 8Facet Elevation and Factors for Slope and Angle Calculations หน้า 8 จาก 8
ค้นหาในเอกสาร
Lec4-324401.pptx
เปิดด้วย Google สไลด์
Chanakan Jungbunjerdsak
(nakanchanakan@gmail.com)หน้า 2 จาก 8 หน้า 1 จาก 8