Table 7. Device and time costs of parameters.
| Parameters | Devices | Median device cost ($) | Time cost for sampling and data process (min/sample) | Average cost of device and time |
|---|---|---|---|---|
| NDVI | Spectrometer | Medium* | Medium** | Medium*** |
| EVI | ||||
| PRI | ||||
| NDWI | ||||
| mNDWI | ||||
| Chlorophyll content | Chlorophyll meter | Low | Low | Low |
| Pn | LI-6400/6800 | High | High | High |
| Gs | ||||
| Tr | ||||
| Y(II) | Fluorometer | Medium | Medium | Medium |
| Biomass | Oven | Low | High | Medium |
Notes:
*
Device cost: low (<$5,000), medium ($5,000–$30,000), and high (>$30,000).
**
Time cost: low (<3 min), medium (4–20 min), and high (>20 min).
***
Average cost: based on the evaluation standards in Table 3.