Rogun Dam, Vakhsh river

One of the tallest dams in the world, under construction in a gorge.

330.6 hectares changed — new water / flooding · Before: 1 Jun 2017 – 15 Sep 2017 · After: 1 Jun 2023 – 15 Sep 2023 · 38.687, 69.780

BEFORE 2017-09

AFTER 2023-09

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330.6 haarea changed

52areas flagged

3,612 haarea examined

2satellites used

What changed, by type

253.0 haNew water / flooding

51.6 haNew construction / earthworks

24.7 haunclassified

1.3 haVegetation cleared

Land changes in both directions at once. SCOPE reports every type it measured, not only the one that makes the better headline.

What SCOPE found

New water / flooding — 173.5 ha
2.3 km north · 86% sure

New water / flooding — 28.7 ha
0.7 km west · 77% sure

New water / flooding — 10.7 ha
2.0 km south-west · 83% sure

New water / flooding — 7.2 ha
1.0 km north · 83% sure

New construction / earthworks — 5.0 ha
2.0 km north-west · 80% sure

How sure is this?

The strongest area (#1) has 86% confidence. It appears in 6 of 6 later clear images, so it is not a one-day artefact. Radar could not confirm or rule them out (normal for vegetation changes), so the result rests on repeated clear optical views and the seasonal comparison. Only 0% of the area had clear optical views, so some change may be hidden by cloud. Note: Optical imagery was unusable (cloud); results rely on Sentinel-1 radar only. Confidence measures how strong the evidence for real surface change is; it does not identify the cause or who did it.

How it was measured

SCOPE used Sentinel-2 optical imagery at 10 m, cloud-masked and combined over each period, Sentinel-1 radar as an independent check . The analysis took 12 seconds.

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