helper_polygon
Create GeoJSON polygon features from coordinate arrays to represent geographic areas, plots, and spatial regions with custom properties.
Instructions
创建多边形特征对象。
此功能根据坐标点数组创建多边形特征，用于表示区域、地块等面状地理要素。
Args: coordinates: 多边形坐标数组 - 类型: str (JSON 字符串格式的数组) - 格式: [[[lng1, lat1], [lng2, lat2], [lng3, lat3], [lng1, lat1]]] - 示例: '[[[125, -15], [113, -22], [154, -27], [144, -15], [125, -15]]]'
Returns: str: JSON 字符串格式的 GeoJSON Polygon Feature - 类型: GeoJSON Feature with Polygon geometry - 格式: {"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [...]}, "properties": {...}} - 示例: '{"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [[[125, -15], [113, -22], [154, -27], [144, -15], [125, -15]]]}, "properties": {"name": "area"}}'
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 >>> coordinates = '[[[125, -15], [113, -22], [154, -27], [144, -15], [125, -15]]]' >>> properties = '{"name": "area"}' >>> result = asyncio.run(polygon(coordinates, properties)) >>> print(result) '{"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [[[125, -15], [113, -22], [154, -27], [144, -15], [125, -15]]]}, "properties": {"name": "area"}}'
Notes: - 输入参数 coordinates、properties 和 options 必须是有效的 JSON 字符串 - 坐标顺序为 [经度, 纬度] (WGS84 坐标系) - 多边形必须形成闭合环，首尾坐标点必须相同 - 支持带孔的多边形（多个环） - 依赖于 Turf.js 库和 Node.js 环境
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| coordinates | Yes | ||
| options | No | ||
| properties | No |