Table 4 Comparison of in-situ and remote-sensing data regarding spatial and temporal conditions, costs, logistics, and confidence in data retrieval
Source data | Spatial resolution | Coverage | Temporal frequency | Costs | Data type | Logistics | Degree of confidence |
|---|---|---|---|---|---|---|---|
In-situ chl-a data | 100–5,000 m | Punctual | High (daily) to low (annually) | High | Qa | - Vessels required | Very high |
- Dependence of weather: high | |||||||
Remote sensing – MODIS TC | 1,000 m; 500 m; 250 m | Synoptic | High (daily or 2/day) | Low: Satellite images; free | Qa | - Computer and informatic scripts to automate the production of TC data | Moderate to high if remotely sensed data are calibrated/validated with in-situ information |
- Dependence of weather: moderate; mapping is possible under moderate cloud cover and with sun glint | |||||||
Computer and software | |||||||
Remote sensing – MODIS level 2 chl-a products | 1,000 m | Synoptic | High (daily or 2/day) | Low: satellite images; free | Ql (Qa if combined with in-situ data) | - Computer and informatic scripts to automate the production of TC data | Low to high if remotely sensed data are calibrated/validated with in-situ information |
Computer and software | - Dependence of weather: very high; no valid information under cloud cover or sun glint | ||||||
Combined in-situ and TC imagery | 1,000 m; 500 m; 250 m | Synoptic | High (daily or 2/day) | High in-situ costs | Qa | - Computer and informatic scripts to automate the production of TC data | Moderate to high if remotely sensed data are calibrated/validated with in-situ information |
Satellite images: free | - Dependence of weather: moderate; mapping is possible under moderate cloud cover and with sun glint | ||||||
Computer and software |