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Erase Analysis Worker

Processes erase operations to remove features using another dataset.

Overview

The erase analysis worker removes portions of features from an input dataset that overlap with features in an erase dataset.

Job Type

erase_analysis

Input Parameters

{
  "input_dataset_id": 123,
  "erase_dataset_id": 124
}

Parameters

input_dataset_id (required): Input dataset ID
erase_dataset_id (required): Erase dataset ID

Output

Creates a new dataset with erased features:

Features with erased portions removed
Remaining geometry after erase operation
Original attributes preserved

Algorithm

The worker uses PostGIS ST_Difference to:

Find features that intersect the erase dataset
Calculate difference (input - erase)
Remove empty geometries
Store results in output table

Example

# Enqueue an erase analysis job via API
curl -X POST "https://example.com/api/analysis_erase_run.php" \
  -H "Content-Type: application/json" \
  -d '{
    "input_dataset_id": 123,
    "erase_dataset_id": 124
  }'

Background Jobs

This analysis runs as a background job. The worker:

Fetches queued erase_analysis jobs
Validates input parameters
Executes PostGIS erase operations
Creates output dataset
Marks job as completed

Performance Considerations

Processing time depends on dataset sizes and overlap
Complex geometries may slow processing
Spatial indexes improve intersection performance
Consider simplifying geometries before erasing

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