In EO, spatial resolution determines the size of the smallest object that can be detected by a sensor. Choosing the right dataset often depends on the balance between resolution, cost & coverage. Here's a quick comparison:
2. ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer)
➡️ VNIR: 15 m
➡️ SWIR: 30 m
➡️ TIR: 90 m
Landsat (e.g., Landsat 8/9)
➡️ Multispectral: 30 m
➡️ Panchromatic: 15 m
➡️ Thermal: 100 m (resampled to 30 m)
3. Sentinel-2
➡️ Multispectral: 10 m, 20 m, 60 m (depending on the band)
UAVs (Drones)
➡️ Extremely high resolution: \~2–20 cm, depending on flight altitude and sensor.