This tool can be used to mark the flowpath initiated from user-specified locations downslope and terminating at either the grid's edge or a grid cell with undefined flow direction. The user must input the name of a D8 flow pointer grid (`d8_pntr`) and an input vector file indicating the location of one or more initiation points, i.e. 'seed points' (`seed_pts`). The seed point file must be a vector of the POINT VectorGeometryType. Note that the flow pointer should be generated from a DEM that has been processed to remove all topographic depression (see breach_depressions_least_cost and fill_depressions) and created using the D8 flow algorithm (d8_pointer).

## See Also

d8_pointer, breach_depressions_least_cost, fill_depressions, downslope_flowpath_length, downslope_distance_to_stream

## Function Signature

`def trace_downslope_flowpaths(self, seed_points: Vector, d8_pointer: Raster, esri_pntr: bool = False, zero_background: bool = False) -> Raster: ...`

## Project Links

WbW Homepage User Manual Support WbW