xrspatial.hydro.stream_link_mfd.stream_link_mfd

xrspatial.hydro.stream_link_mfd.stream_link_mfd(fractions: DataArray, flow_accum: DataArray, threshold: float = 100, name: str = 'stream_link_mfd') → DataArray

Assign unique IDs to stream link segments (MFD).

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

Parameters:

• fractions (xarray.DataArray or xr.Dataset) – 3-D MFD flow direction array of shape (8, H, W) as returned by flow_direction_mfd. Values are flow fractions in [0, 1] that sum to 1.0 at each cell (NaN at nodata cells). The neighbor order is: E(0), SE(1), S(2), SW(3), W(4), NW(5), N(6), NE(7).

• flow_accum (xarray.DataArray) – 2-D 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_mfd') – Name of output DataArray.

Returns:

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

Return type:

xarray.DataArray or xr.Dataset