Parameter | NASA/ESA satellites | VHRÂ satellites | Aerial mapping | Fixed wing UAV | Rotary UAV |
---|---|---|---|---|---|
Revisit time | ~ 5 days | ~ 3 days | a | a | a |
Resolution | ~ 10 m | ~ 0.3 m | ~ 0.1 m | ~ 0.01 m | 0.015 m |
Costs of imagery | Free | High | High | Low | Low |
Area coverable | High | High | Medium | Medium–low | Low |
Wind resistance | N/A | N/A | High–medium | Medium–low | Low |
Influence of cloud cover | High | High | High | Medium–low (If no rain) | Low (if no rain) |
Volume of data collected | Moderate | High | High | High–very high | High–very high |