Powerline Vegetation Risk

Identifies high vegetation, rapid growth, and potential tree fall risks along powerline corridors. Outputs prioritized inspection points with evidence slices.

Trigger

Use when the user wants to:

• Screen vegetation encroachment risk along powerline corridors
• Assess tree fall hazards toward powerlines
• Prioritize inspection routes based on vegetation risk
• Generate evidence slices for maintenance planning
• Evaluate clearance between vegetation and conductors
• Identify fast-growing vegetation near lines

CLI Usage

# Basic analysis with default parameters (110kv, synthetic data)
python scripts/powerline_vegetation_risk.py --output-dir ./pvr-output

# 220kv line with custom conductor height
python scripts/powerline_vegetation_risk.py \
  --voltage 220kv \
  --conductor-height 14.0 \
  --output-dir ./pvr-output

# Without conductor height data (proximity risk only)
python scripts/powerline_vegetation_risk.py \
  --voltage 110kv \
  --no-conductor-data \
  --output-dir ./pvr-output

# Custom corridor width and fall factor
python scripts/powerline_vegetation_risk.py \
  --voltage 500kv \
  --corridor-width 60.0 \
  --fall-factor 1.2 \
  --output-dir ./pvr-output

# With custom risk scoring rules
python scripts/powerline_vegetation_risk.py \
  --voltage 110kv \
  --risk-rules references/risk_scoring.json \
  --output-dir ./pvr-output

Parameters

Parameter	Default	Description
--voltage	110kv	Voltage level: 10kv, 35kv, 110kv, 220kv, 500kv, 1000kv
--conductor-height	from schema	Conductor height above ground (meters)
--no-conductor-data	False	Flag: no conductor height data available
--corridor-width	from schema	Custom corridor half-width (meters)
--fall-factor	1.0	Tree fall reach factor (1.0 = tree height = reach)
--risk-rules	built-in	Custom risk scoring rules JSON
--powerlines	None	Powerlines GeoJSON file (LineString)
--trees	None	Trees GeoJSON file (Point with height/growth_rate)
--output-dir	./pvr-output	Output directory

Output

File	Description
risk_points.geojson	Point features for each vegetation risk location
risk_segments.geojson	Line features for high-risk line segments
clearance.tif	Raster map of vertical clearance (meters)
inspection_priority.csv	Ranked inspection segments with recommendations
request.json	Analysis request metadata
output-manifest.json	Output file inventory and risk summary
qa.json	Quality assurance checks

Risk Level Codes

Code	Name	Description	Action
4	critical	Immediate risk	Dispatch crew within 24 hours
3	high	Priority risk	Schedule inspection within 7 days
2	medium	Planned risk	Include in next scheduled patrol
1	low	Monitor	Note for next routine inspection
0	minimal	No action	No action needed

Risk Scoring Factors

Each tree/vegetation point is scored on 5 factors (total 0-50):

Factor	Max	Description
Height proximity	10	Vegetation height relative to conductor
Growth rate	10	Annual growth rate (m/year)
Fall risk	10	Tree fall reach vs. distance to line
Slope exposure	8	Terrain steepness toward line
Wind exposure	6	Storm/wind frequency factor

Key Algorithms

Clearance Analysis

Computes vertical clearance = conductor_height - vegetation_height. Without conductor data, outputs proximity risk only (no true clearance).

Fall Risk

A tree can fall toward the line if tree_height * fall_factor >= distance_to_line. This considers horizontal distance, not just corridor intersection.

Corridor Generation

Buffers the powerline by voltage-dependent half-width (e.g., 25m for 110kv, 50m for 500kv). Custom width overrides default.

Segment Analysis

Each line segment between towers is analyzed independently. Trees within reach distance are scored and the segment gets the maximum risk level.

Exit Codes

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

Limitations

• Without conductor height data, clearance values are estimates only
• Optical imagery cannot reliably provide individual tree heights
• Engineering safety conclusions require field verification
• Sensitive line data is processed locally (not uploaded)
• Fall factor is a simplification; actual fall direction depends on wind and tree species

References

• GB/T 50545-2010: Code for design of 110kV~750kV overhead transmission line
• DL/T 741-2010: Operating code for overhead transmission line
• Common utility vegetation management practices (IEEE)

数据下载

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

python powerline_vegetation_risk.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)。