measurement_along

Calculate coordinates at a specified distance along a GeoJSON line from its starting point, returning the exact location as a GeoJSON Point feature.

Instructions

在线上计算指定距离处的点位置。

此功能沿着给定线段从起点开始移动指定距离，找到对应的坐标点位置。

Args: line: GeoJSON LineString 特征或几何图形 - 类型: str (JSON 字符串格式的 GeoJSON) - 格式: 必须符合 GeoJSON LineString 规范 - 坐标系: WGS84 (经度在前，纬度在后) - 示例: '{"type": "LineString", "coordinates": [[-83, 30], [-84, 36], [-78, 41]]}'

distance: 沿线的距离 - 类型: float - 描述: 从起点开始沿线的距离值 - 范围: 0 到线的总长度（超出范围会自动截断到端点） - 示例: 200.0 options: 可选参数配置 - 类型: str (JSON 字符串) 或 None - 可选字段: - units: 距离单位 (默认: 'kilometers') - 有效值: 'miles', 'nauticalmiles', 'kilometers', 'meters', 'yards', 'feet', 'inches' - 其他 Turf.js 支持的选项参数 - 示例: '{"units": "miles"}'

Returns: str: JSON 字符串格式的 GeoJSON Point 特征 - 类型: GeoJSON Feature with Point geometry - 格式: {"type": "Feature", "geometry": {"type": "Point", "coordinates": [lng, lat]}} - 示例: '{"type": "Feature", "geometry": {"type": "Point", "coordinates": [-82.5, 33.2]}}'

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 >>> line = '{"type": "LineString", "coordinates": [[-83, 30], [-84, 36], [-78, 41]]}' >>> options = '{"units": "miles"}' >>> result = asyncio.run(along(line, 200, options)) >>> print(result) '{"type": "Feature", "geometry": {"type": "Point", "coordinates": [-82.5, 33.2]}}'

Notes: - 如果距离超过线长度，会自动返回线终点 - 如果距离为负值，会自动返回线起点 - 输入参数 line 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) - 依赖于 Turf.js 库和 Node.js 环境

Input Schema

Name	Required	Description	Default
`distance`	Yes
`line`	Yes
`options`	No

Input Schema (JSON Schema)

{ "properties": { "distance": { "type": "number" }, "line": { "type": "string" }, "options": { "anyOf": [ { "type": "string" }, { "type": "null" } ], "default": null } }, "required": [ "line", "distance" ], "type": "object" }

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