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117 lines
2.1 KiB
Markdown
117 lines
2.1 KiB
Markdown
# GeoIntel Kempen — Change Detection Specification v1.0
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Change Detection is a major showcase workflow combining raster, vector, AI and QA/QC.
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## Goal
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Compare two datasets or analysis runs for the same area and detect additions, removals and significant changes.
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## Supported methods
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## Method A — Vector change detection V1
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Compare two vector layers or two analysis outputs.
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Examples:
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- GRB buildings snapshot A vs snapshot B.
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- AI detections from raster A vs AI detections from raster B.
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- OSM buildings from run A vs OSM buildings from run B.
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### Inputs
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- layer A
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- layer B
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- area polygon
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- class filter optional
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- matching threshold
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### Algorithm
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1. Normalize CRS.
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2. Clip both layers to area.
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3. Match features using IoU or spatial overlap.
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4. Classify:
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- added: feature in B without match in A
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- removed: feature in A without match in B
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- unchanged: matched with stable geometry
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- modified: matched but area or geometry changed above threshold
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### Metrics
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- added count
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- removed count
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- modified count
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- added area m²
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- removed area m²
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- net area change m²
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- percentage change
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## Method B — Raster index change V2
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Compare NDVI/NDWI/NDBI rasters.
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### Inputs
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- index raster A
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- index raster B
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- threshold
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### Algorithm
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```text
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delta = index_B - index_A
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classify pixels by threshold
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polygonize changed zones
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```
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### Outputs
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- change raster
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- changed polygons
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- summary statistics
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## Method C — AI segmentation change V3
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Run segmentation on both images and compare class polygons.
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Examples:
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- vegetation loss
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- new buildings
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- water change
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## Output layers
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- `change_added`
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- `change_removed`
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- `change_modified`
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- `change_heatmap`
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- `change_uncertain`
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## API
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```http
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POST /analysis/change-detection
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GET /analysis/{id}/changes
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POST /analysis/{id}/exports/change-geojson
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```
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## UI requirements
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Change Lab must support:
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- dataset/layer A selector
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- dataset/layer B selector
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- method selector
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- area selector
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- threshold controls
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- timeline labels
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- map overlays for added/removed/modified
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- metrics cards
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- export
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## V1 target
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Implement vector change detection. Raster and AI-based change detection are later phases.
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