ΣX
SIGMA X · Satellite Intelligence for Growth & Mapping Analysis · Kota Batam
Reasoned by Gemma 4

All signals · 12 kecamatan

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Δ = change from the base year to the latest full year (satellite), Jan 2024 → Oct 2026 (hotels, OSM). pp = percentage points. Click a row to open that kecamatan.

How the growth score is made

How ΣX works

  1. Zones: the 12 kecamatan of Kota Batam, official administrative boundaries (OCHA HDX COD-AB).
  2. Satellite (Google Earth Engine), 2019→2025 + 2026 YTD: Sentinel-2 NDVI / NDBI / MNDWI (Cloud Score+ masked medians), Dynamic World land cover, Sentinel-1 radar backscatter, VIIRS night lights, Landsat 8/9 land-surface temperature, Google Open Buildings 2.5D Temporal (2019–2023), GHSL population.
  3. Ground truth: 424 hotels from a Jan 2024 Google Maps scrape, re-checked one by one with the Places API in Oct 2026 (still open / closed / gone), plus hotel-type listings not in the 2024 list; OpenStreetMap F&B, retail and office counts Jan 2024 vs today.
  4. Gemma 4 (gemma-4-31b-it) is the analyst: per kecamatan it reads the numbers and the before/after imagery plus a change map, reconciles conflicts (e.g. NDBI up but the land is only cleared), and returns a verdict, score, 2028 outlook and recommendation. A second call ranks all zones. “Ask ΣX” queries Gemma live over the same evidence.

Indicators, not official statistics. OSM counts partly reflect mapping effort; new-listing counts mix new hotels with ones the 2024 scrape missed. Contains modified Copernicus Sentinel data 2019–2026. Basemap: OpenFreeMap, © OpenMapTiles, © OpenStreetMap contributors.