xrspatial.hydro.stream_link_d8.stream_link_d8

xrspatial.hydro.stream_link_d8.stream_link_d8(flow_dir: DataArray, flow_accum: DataArray, threshold: float = 100, name: str = 'stream_link') → DataArray

Assign unique IDs to stream link segments.

Each contiguous stream segment between junctions, headwaters, and outlets receives a distinct positive integer ID. Non-stream cells are NaN.

Parameters:

• flow_dir (xarray.DataArray or xr.Dataset) – 2D D8 flow direction grid (codes 0/1/2/4/8/16/32/64/128; NaN for nodata).

• flow_accum (xarray.DataArray) – 2D flow accumulation grid. Cells with flow_accum >= threshold are stream cells.

• threshold (float, default 100) – Minimum accumulation for stream classification.

• name (str, default 'stream_link') – Name of output DataArray.

Returns:

2D float64 grid where each stream link has a unique positive integer ID. Non-stream cells are NaN.

Return type:

xarray.DataArray or xr.Dataset