dem_viewshed — DEM visibility op

• Data kinds: depth → image2d

• Call: import demops; demops.dem_viewshed(dem, cell_size, observer_rc, observer_height_m=1.7, target_height_m=0.0, max_distance_m=None) (or opsdem.get("dem_viewshed"))

Usage

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

1 点からの可視領域(1 = 見える)。視線が地形に遮られるかを判定する。

`observer_rc は (row, col)`。観測点自身は常に可視。

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_horizon_angle · dem_sky_view_factor

*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.