transformation_convex
Calculate the convex hull polygon from a set of geographic points using GeoJSON input to identify the smallest convex boundary containing all points.
Instructions
计算点集的凸包。
该函数使用 Turf.js 库的 convex 方法，从一组点生成凸包多边形。
Args: points: 点集 GeoJSON FeatureCollection - 类型: str (JSON 字符串格式的 GeoJSON) - 格式: 必须符合 GeoJSON FeatureCollection 规范，包含 Point 特征 - 坐标系: WGS84 (经度在前，纬度在后) - 示例: '{"type": "FeatureCollection", "features": [{"type": "Feature", "geometry": {"type": "Point", "coordinates": [10.195312, 43.755225]}}, ...]}'
Returns: str: JSON 字符串格式的凸包 GeoJSON Polygon 特征 - 类型: GeoJSON Feature with Polygon geometry - 格式: {"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [...]}} - 示例: '{"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [[[10.195312, 43.755225], [10.404052, 43.8424511], ...]]}}'
Raises: Exception: 当 JavaScript 执行失败、超时或输入数据格式错误时抛出异常
Example: >>> import asyncio >>> points = '{"type": "FeatureCollection", "features": [{"type": "Feature", "geometry": {"type": "Point", "coordinates": [10.195312, 43.755225]}}]}' >>> result = asyncio.run(convex(points)) >>> print(result) '{"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [[[10.195312, 43.755225], [10.404052, 43.8424511], ...]]}}'
Notes: - 输入参数 points 必须是有效的 JSON 字符串 - 坐标顺序为 [经度, 纬度] (WGS84 坐标系) - 凸包是包含所有点的最小凸多边形 - 依赖于 Turf.js 库和 Node.js 环境
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| points | Yes |