transformation_dissolve
Combine adjacent polygons in GeoJSON data to simplify spatial analysis and reduce feature complexity.
Instructions
合并相邻的多边形。
该函数使用 Turf.js 库的 dissolve 方法，合并相邻的多边形特征。
Args: featureCollection: 多边形特征集合 - 类型: str (JSON 字符串格式的 GeoJSON) - 格式: 必须符合 GeoJSON FeatureCollection 规范，包含 Polygon 特征 - 坐标系: WGS84 (经度在前，纬度在后) - 示例: '{"type": "FeatureCollection", "features": [{"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [[[0, 0], [0, 1], [1, 1], [1, 0], [0, 0]]]}}, {"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [[[0, -1], [0, 0], [1, 0], [1, -1], [0,-1]]]}}]}'
options: 可选参数配置
- 类型: str (JSON 字符串) 或 None
- 可选字段:
- propertyName: 用于分组合并的属性名称
- 示例: '{"propertyName": "combine"}'Returns: str: JSON 字符串格式的合并后的 GeoJSON FeatureCollection - 类型: GeoJSON FeatureCollection with Polygon features - 格式: {"type": "FeatureCollection", "features": [{"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [...]}}]} - 示例: '{"type": "FeatureCollection", "features": [{"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [[[0, -1], [0, 1], [1, 1], [1, -1], [0, -1]]]}}]}'
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 >>> featureCollection = '{"type": "FeatureCollection", "features": [{"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [[[0, 0], [0, 1], [1, 1], [1, 0], [0, 0]]]}}, {"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [[[0, -1], [0, 0], [1, 0], [1, -1], [0,-1]]]}}]}' >>> options = '{"propertyName": "combine"}' >>> result = asyncio.run(dissolve(featureCollection, options)) >>> print(result) '{"type": "FeatureCollection", "features": [{"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [[[0, -1], [0, 1], [1, 1], [1, -1], [0, -1]]]}}]}'
Notes: - 输入参数 featureCollection 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) - 不支持 MultiPolygon 特征 - 如果提供 propertyName，只有具有相同属性值的多边形才会被合并 - 依赖于 Turf.js 库和 Node.js 环境
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| featureCollection | Yes | ||
| options | No |
Output Schema
| Name | Required | Description | Default |
|---|---|---|---|
| result | Yes |