dsh-geodesy v0.2.0 — three new spherical-geometry tools
New tools
geo_rhumb— rhumb-line (constant-heading / loxodrome) distance and bearing between two points, with the great-circle distance for comparison. Keeps the same compass heading the whole way.geo_intersection— crossing of two great-circle paths (start point + initial bearing each). Reports the crossing nearest to the first path's start, the antipodal crossing, and distances from both starts; coincident paths are rejected with a clear error.geo_area— area and perimeter of a spherical polygon via spherical excess (Girard's theorem), pole-safe vector implementation, complement area always included, deterministic winding semantics.
Quality
- 154 tests all green (39 new); every numeric anchor generated by an independent closed-form + numeric-integration oracle (test/anchors_v2.py), including the exact octant case (area = πR²/2), planar shoelace limits, and cross-track ≈ 0 checks for intersections.
- Zero runtime dependencies, pure math, no network I/O.
Install: dsh plugin --profile web add github:TYEclipse/dsh-geodesy
中文 changelog
新增三个球面几何工具：geo_rhumb（恒向线/等角航线距离与恒定航向角，附大圆距离对比）、geo_intersection（两条大圆路径交点：最近交点+对跖交点+距两端起点距离，重合路径明确报错）、geo_area（球面多边形面积与周长，球面角盈公式，矢量实现极点安全，附互补区域面积）。154 个测试全绿，全部数值锚点由独立闭式+数值积分 oracle 脚本生成（含八分球精确例 πR²/2、平面鞋带公式极限交叉验证、交点横偏距≈0 校验）。零运行时依赖。