feature_conversion_flatten
Convert complex multi-geometries into simple geometry feature collections for easier geospatial analysis and processing.
Instructions
将复合几何图形展平为简单几何图形。
此功能将多几何图形（如多点、多线、多多边形）展平为对应的简单几何图形特征集合。
Args: geojson: GeoJSON 对象 - 类型: str (JSON 字符串格式的 GeoJSON) - 格式: 任何有效的 GeoJSON 对象 - 坐标系: WGS84 (经度在前，纬度在后) - 示例: '{"type": "MultiPolygon", "coordinates": [[[[102.0, 2.0], [103.0, 2.0], [103.0, 3.0], [102.0, 3.0], [102.0, 2.0]]], [[[100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0]]]]}'
Returns: str: JSON 字符串格式的展平后特征集合 - 类型: GeoJSON FeatureCollection with simple geometry features - 格式: {"type": "FeatureCollection", "features": [{"type": "Feature", "geometry": {"type": "...", "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 >>> multi_polygon = '{"type": "MultiPolygon", "coordinates": [[[[102.0, 2.0], [103.0, 2.0], [103.0, 3.0], [102.0, 3.0], [102.0, 2.0]]], [[[100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0]]]]}' >>> result = asyncio.run(flatten(multi_polygon)) >>> print(result) '{"type": "FeatureCollection", "features": [{"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [[[102.0, 2.0], [103.0, 2.0], [103.0, 3.0], [102.0, 3.0], [102.0, 2.0]]]}}, ...]}'
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) - 多几何图形会被展平为对应的简单几何图形集合 - 依赖于 Turf.js 库和 Node.js 环境
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| geojson | Yes |
Output Schema
| Name | Required | Description | Default |
|---|---|---|---|
| result | Yes |