Sydney: land change, 2015–2025
Two Sentinel-2 satellite images of a 20 km square around Sydney, from 2015-12-18 and 2025-01-14, were classified by a ResNet18 model trained on EuroSAT. Every 640 m cell is put in one of four land-cover groups, and the two dates are compared cell by cell.
- Before
- 2015-12-18
- After
- 2025-01-14
- Area analysed
- 367 km²
Change
-11.1 km²net change in built-up area
In cells the model is sure of on both dates (confidence ≥ 0.8): 0 km² became built-up, 2.5 km² changed in total.
The model is undecided on this scene; treat the results with caution.
Part of the image is cloudy or missing; results are unreliable there.
Land cover on both dates
| 2015 | 2025 | ± | |
|---|---|---|---|
| Agriculture no notable change | 0.3% | 0.2% | -0.1 |
| Natural vegetation no notable change | 9.7% | 9.8% | +0.1 |
| Built-up decreased | 60% | 57% | -3 |
| Water increased | 30% | 33% | +3 |
Largest transitions (confident cells)
- Built-up → Natural vegetation1.2 km²
- Natural vegetation → Water0.8 km²
- Built-up → Water0.4 km²
Limits
- Every value shown is a model estimate, not a measurement.
- Areas are not measurements but approximations counted from cells. The figures are always computed on 640 m cells; the scale only changes how the map is drawn.
- The model was trained on European images only; results for places tagged "experimental" are less reliable.
- Clouds, shadows and seasonal differences can show change that is not there.