How to map yurts in Ulaanbaatar and save time using open source AI tools

Why yurts?

Ulaanbaatar (https://map.openaerialmap.org/#/106.92721590399742,47.937303861545516,19/square/1302310/59e62b7a3d6412ef7220952e?_k=nkhprp)
Ulaanbaatar (https://commons.wikimedia.org/wiki/File:The_private_sector_with_yurts_against_the_backdrop_of_high-rise_new_buildings_in_Ulaanbaatar.jpg)
Ulaanbaatar city area

Existing solutions

Phase 1. Let’s make simple model and try to use it!

Dataset

All squares 2.5x2.5km (EPSG:3857)

Training

Validation

QGIS polygons to centroids to circles processing
Before — red, after — blue
Inference in rural areas
False positives
Green — phase 1 territory, blue — phase 2 territory
  • 35k true positives
  • 65k false positives
  • 2k false negatives
  • precision 0.35
  • recall 0.94
  • f1 0.51

Phase 2. Let’s remove false positives and do best!

Red — positive chips
Chip squares
Phase 1 model with Phase 2 chips
Phase 1 model with yurts within Phase 2 chips

Validation

  • 62k true positives
  • 11k false positives
  • 6k false negatives
  • precision 0.84
  • recall 0.91
  • f1 0.87

Phase 3. Let’s merge it together!

Merged result

Totals

  • AI assisted mapping 12+1+2+1+4+24+2+2+1+4+16+8=77 hours
  • Mapping by hands 100k items / 0.16k items per hour = 625 hours

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ML engineer

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Aliaksandr

Aliaksandr

ML engineer

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