dem_roughness — DEM surface op

• Data kinds: depth → image2d

• Call: import demops; demops.dem_roughness(dem, cell_size=1.0) (or opsdem.get("dem_roughness"))

Usage

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

地形起伏指数 TRI —— 8 近傍との標高差の二乗平均平方根 [m]。

Riley ほか (1999)。`cell_size` は結果に影響しないが、**単位が m である

ことを呼び出し側に意識させる**ために受け取る(検証もする)。

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)

• (none yet)

Ops the type connects to (they accept image2d as input)

—

Same category (surface)

dem_slope · dem_aspect · dem_curvature · 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.