---

name: wetland-change-monitor description: > Monitor wetland extent, inundation frequency, and land cover transitions to identify degradation, recovery, and human encroachment. Use when the user wants to track wetland changes over time, assess wetland health, or detect conversion of wetlands to other land covers.

Wetland Change Monitor

Monitors wetland extent, inundation frequency, and land cover transitions from multi-year water occurrence rasters. Identifies degradation, recovery, and human encroachment patterns.

CLI Usage

python scripts/wetland_change_monitor.py --water-frequency water_freq.tif --years 2015 2016 2017 2018 2019
python scripts/wetland_change_monitor.py --water-frequency wf.tif --years 2018 2019 2020 --frequency-thresholds 0.25 0.75
python scripts/wetland_change_monitor.py --water-masks masks.tif --years 2015 2020 --change-schema degradation recovery stable

数据下载

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

# 自动下载 JRC GSW (water frequency) + Sentinel-1 GRD (water mask)
python scripts/wetland_change_monitor.py \
    --bbox 116.30,39.85,116.45,39.95 \
    --date-range 2020-06-01,2020-09-30 \
    --years 2015 2020 \
    --output-dir ./wcm-auto

下载的内容:

• JRC Global Surface Water (jrc-gsw) — 历史水体频率，替换 --water-frequency
• Sentinel-1 GRD (sentinel-1-grd) — SAR 水体掩膜，替换 --water-masks

下载元数据（data_source, fetched_at, collection, jrc_downloaded, sentinel1_downloaded）会写入 output-manifest.json。

Parameters

Parameter	Description
--water-frequency	Multi-band water frequency raster (JRC-style, bands = years)
--water-masks	Alternative: multi-band binary water masks (1=water, 0=dry)
--years	List of years corresponding to bands
--frequency-thresholds	Two thresholds for classification (default: 0.25 0.75)
--change-schema	Change types to detect (default: degradation recovery stable)
--include-sar	Include SAR-based water detection (optional)
--min-area	Minimum patch area in hectares (default: 0.5)
--output-dir	Output directory (default: wetland-output)

Output

File	Description
wetland_type.tif	Wetland type classification raster
inundation_frequency.tif	Inundation frequency raster (0-1)
wetland_change.geojson	Vectorized change patches with type and confidence
transition_matrix.csv	Year-to-year transition matrix
wetland-report.json	Detailed statistics and summary
output-manifest.json	Machine-readable manifest

Exit Codes

Code	Meaning
0	Success
2	Argument error
3	Dependency missing
6	Validation error
7	Processing failure

数据下载

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

python wetland_change_monitor.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)。