feature_conversion_polygonize
Convert line geometries to polygons by detecting closed regions in GeoJSON LineString or MultiLineString data, enabling polygon creation from linear features for spatial analysis.
Instructions
将线几何图形转换为多边形。
此功能将线或多线几何图形转换为多边形几何图形集合，基于线的闭合区域创建多边形。
Args: geojson: GeoJSON 对象 - 类型: str (JSON 字符串格式的 GeoJSON) - 格式: 必须符合 GeoJSON FeatureCollection, Geometry 或 Feature 规范，包含 LineString 或 MultiLineString - 坐标系: WGS84 (经度在前，纬度在后) - 示例: '{"type": "FeatureCollection", "features": [{"type": "Feature", "geometry": {"type": "LineString", "coordinates": [[0, 0], [1, 0], [1, 1], [0, 1], [0, 0]]}}]}'
Returns: str: JSON 字符串格式的多边形特征集合 - 类型: GeoJSON FeatureCollection with Polygon features - 格式: {"type": "FeatureCollection", "features": [{"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [...]}}, ...]}
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 >>> geojson = '{"type": "FeatureCollection", "features": [{"type": "Feature", "geometry": {"type": "LineString", "coordinates": [[0, 0], [1, 0], [1, 1], [0, 1], [0, 0]]}}]}' >>> result = asyncio.run(polygonize(geojson)) >>> print(result) '{"type": "FeatureCollection", "features": [{"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [[[0, 0], [1, 0], [1, 1], [0, 1], [0, 0]]]}}]}'
Notes: - 输入参数 geojson 必须是有效的 JSON 字符串 - 坐标顺序为 [经度, 纬度] (WGS84 坐标系) - 基于线的闭合区域创建多边形 - 依赖于 Turf.js 库和 Node.js 环境
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| geojson | Yes |