dem_fill_sinks — DEM hydrology op

• Data kinds: depth → depth

• Call: import fullseye as fs; fs.ledger.dem_fill_sinks(dem, epsilon=0.0, nodata='error') (to call the implementation directly, import demops; demops.dem_fill_sinks(dem, epsilon=0.0, nodata='error'); from the registry, opsdem.get("dem_fill_sinks"))

Usage

DEM with its depressions filled. The priority-flood of Barnes, Lehman & Mulla (2014).

Giving epsilon a tiny value (e.g. 1e-6) adds a slight slope to the filled flats (without it, flow direction is undefined on flats and the accumulation vanishes midway).

nodata is one of NODATA_POLICIES. "outlet" treats missing cells, like the outer border, as seeds (water flowing into a water body leaves the system there). "barrier" excludes missing cells from filling and returns their values as nan.

The output is at least the input (filled >= dem, excluding missing cells).

Detailed usage guide

• dem_terrain_analysis family guide

References (sample data, literature)

• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).

• Operator provenance and references — the sources of the research/methods this op family came from.

• The canonical algorithm (author, year) and its uses are named in the family usage guide above.

Runnable examples (verified samples that actually call this op)

• poc_dem_terrain — py -3.11 examples/poc_dem_terrain.py

Ops the type connects to (they accept depth as input)

dem_slope · dem_aspect · dem_curvature · dem_roughness · dem_tpi · dem_hillshade · dem_flow_direction · dem_flow_accumulation

Same category (hydrology)

dem_flow_direction · dem_flow_accumulation · dem_stream_network

*Provenance: demops.py — DEM operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.