dem_aspect — DEM surface op

• Data kinds: depth → image2d

• Call: import demops; demops.dem_aspect(dem, cell_size, method='horn', flat_tol=1e-12) (or opsdem.get("dem_aspect"))

Usage

> This operator's description has not been translated yet. The original text follows as it is.

斜面方位 [度]。北 0 度・東回り。平坦なセルは :data:ASPECT_FLAT。

平坦を 0 で返さないのは、0 が「北向き斜面」を意味してしまうため

—— 区別できない値を返すのは、例外を出さずに間違える典型。

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_curvature · 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.