65 lines
1.5 KiB
Markdown
65 lines
1.5 KiB
Markdown
# 缓冲区分析套件
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## 功能
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对 GeoJSON 中的地块做缓冲区分析，输出处理前后的面积对比报告。
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## workflow.yaml
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```yaml
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name: parcel-analysis
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description: 地块数据批处理 — 生成→验证→缓冲区→对比→报告
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version: 2.0.0
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category: gis-processing
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tags: [gis, parcel, buffer]
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params:
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type: object
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required:
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- buffer_distance
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properties:
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buffer_distance:
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type: number
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default: 0.5
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description: 缓冲区距离（度）
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steps:
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- id: main
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name: 全流水线
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script_id: process
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params:
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buffer_distance: $params.buffer_distance
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resolved_params:
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- step_index: 0
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step_name: 全流水线
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params:
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buffer_distance: 0.5
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```
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## 处理流程
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5 个阶段在单脚本中顺序执行：
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| 阶段 | 功能 | 产出 |
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|------|------|------|
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| Phase 1 | 生成 3 个示例地块 GeoJSON | `input_parcels.geojson` |
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| Phase 2 | 验证 GeoJSON 结构、统计要素 | 校验报告 |
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| Phase 3 | 缓冲区分析（顶点偏移算法） | `buffered_parcels.geojson` |
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| Phase 4 | 计算每个地块处理前后的面积变化 | 面积对比 JSON |
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| Phase 5 | 生成完整的对比报告 | `comparison_report.json` |
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## 输出示例
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```json
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{
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"areas": [
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{"id": "P001", "before": 0.02, "after": 0.308, "change_pct": 1439.34},
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{"id": "P002", "before": 0.018, "after": 0.327, "change_pct": 1717.11}
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],
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"total_before": 0.056,
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"total_after": 0.962,
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"total_change_pct": 1617.91
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}
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```
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