dem_curvature — DEM surface op

• Data kinds: depth → image2d

• Call: import fullseye as fs; fs.ledger.dem_curvature(dem, cell_size, kind='profile') (to call the implementation directly, import demops; demops.dem_curvature(dem, cell_size, kind='profile'); from the registry, opsdem.get("dem_curvature"))

Usage

Curvature [1/m]. kind is "profile" (profile) / "planform" (plan) / "total".

Quadratic surface fit of Zevenbergen & Thorne (1987). Profile curvature expresses the convexity/concavity along the flow direction (acceleration/deceleration), plan curvature the bending of contour lines (convergence/divergence).

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 image2d as input)

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Same category (surface)

dem_slope · dem_aspect · dem_roughness · dem_tpi

*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.