---

name: cropland-change-compliance description: > Detect and classify cropland changes from before/after NDVI rasters. Identifies suspected construction, water, forest, and bare soil changes and generates compliance investigation materials. Use when the user wants to check farmland for unauthorized changes, monitor cropland conversion, or generate compliance reports.

Cropland Change Compliance

Detects and classifies cropland changes from multi-temporal NDVI rasters.

CLI Usage

python scripts/cropland_change_compliance.py --before-ndvi before.tif --after-ndvi after.tif
python scripts/cropland_change_compliance.py --before-ndvi b.tif --after-ndvi a.tif --ndvi-threshold 0.2

Output

File	Description
report.html	Compliance report
compliance-report.json	Detailed results
suspected_changes.geojson	Suspected change findings
output-manifest.json	Machine-readable manifest

Exit Codes

Code	Meaning
0	Success
2	Argument error
7	Processing failure

Parameters

Flag	Type	Default	Required	Description
--before-ndvi	path	None	(yes unless --synthetic)	Path to before-period NDVI raster (GeoTIFF)
--after-ndvi	path	None	(yes unless --synthetic)	Path to after-period NDVI raster (GeoTIFF)
--ndvi-threshold	float	0.15	no	Minimum
--rules	path	None	no	Custom compliance rules JSON
--synthetic	flag	False	no	Run with synthetic demo data (no real inputs needed)
--output-dir / -o	path	compliance-output	no	Output directory

数据下载

本 skill 可自动从 Microsoft Planetary Computer 下载数据 (无需 API key):

python cropland_change_compliance.py --bbox 116,39,117,40 --date-range 2024-06-01,2024-06-30 --output-dir <tmp>

• --bbox W,S,E,N: WGS-84 边界框 (西, 南, 东, 北)
• --date-range START,END: 日期范围 (YYYY-MM-DD,YYYY-MM-DD)
• --aoi-file <path.geojson>: 替代 --bbox 的 GeoJSON 多边形
• --cache-dir <path>: 缓存目录 (默认 ~/.geoskill_cache)

当用户只给 --bbox + --date-range (没有 --image) 时，skill 自动下载数据。 当用户给 --image 时，走原文件路径 (向后兼容)。