dem_horizon_angle — DEM visibility op

• Data kinds: depth → image2d

• Call: import demops; demops.dem_horizon_angle(dem, cell_size, azimuth_deg, max_distance_m=None) (or opsdem.get("dem_horizon_angle"))

Usage

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

指定方位の地平線仰角 [度]。0 は水平、90 は真上が塞がれている状態。

各セルから `azimuth_deg の向きへ視線を進め、atan((z_j - z_0)/d)` の

最大値を返す。落ちる影・日照時間・天空率の下ごしらえになる。

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 (visibility)

dem_sky_view_factor · dem_viewshed

*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.