## 5 Results and Discussion
### Trends to Be Further Explored
#### 5.3.1 Less Frequently Used Spectral Bands and VIs
\begin{table}
\begin{tabular}{l l l} \hline \hline
**Class/Parameter** & **Spectral Vegetation Indices** & **Attested by** \\ \hline Bare soil & MNDWI, NDBI, NDBI, NDTI, WDVI, GEMI, DBI, MNDISI & [PERSON] et al. (2019), [PERSON] et al. (2016), \\  & DBSI, SRNIRRarrowRed, SRNIRRarrowGreen, RTVIcore, INUI & [PERSON] (2018), [PERSON] et al. (2018), [PERSON] et al. (2020) \\ \hline Grasslands, shrublands, rangelands and pastures & WSIRarrow, IRI, RedSWIR, NDSWIR, NBR, NBR-2, & [PERSON] et al. (2015), [PERSON] et al. (2016), [PERSON] et al. (2018), \\  & BAL, MNDWI, NDMI, REIP, MNSI, AFR1.6 & [PERSON] et al. (2018), [PERSON] et al. (2019), [PERSON] et al. (2018) \\ \hline Mangrove & CMRI, MMRI, DNVI & [PERSON] (2020), [PERSON] et al. (2020), [PERSON] and [PERSON] (2018) \\ \hline Water bodies & MNDWI, NHI, VSDI & [PERSON] et al. (2016), [PERSON] et al. (2016), [PERSON] et al. (2018), \\  & [PERSON] et al. (2015), [PERSON] et al. (2018), [PERSON] et al. (2017) \\ \hline Settlements and & MNDWI, NDBI, MNDBI, & [PERSON] et al. (2018), [PERSON] et al. (2016), \\ built-up areas & IBI, DBI, DBSI, NRUI & [PERSON] et al. (2018), [PERSON] and [PERSON] (2018), [PERSON] et al. (2018) \\ \hline \hline \end{tabular} Source: Cited papers.  
\end{table} 
Table 3: _Cont._Red-edge associated VIs also have their nomenclature confused in some moments. The CIre, original formula (NIR)/(695 nm-740 nm)\({}^{-1}\), developed by [PERSON] et al. [172], was already formulated using NIR and Red-edge bands [37; 86; 168], two Red-edge bands [39; 85; 167; 169], and Red-edge and Green bands [158]. The NDVIre (also called RENDVI) [170], formula (NIR \(-\) RE1)/(NIR \(+\) RE1), received variations along the time, as the inversion of the Red-edge position in the formula (RE1 \(-\) NIR)/(RE1 \(+\) NIR) [174] and the use of other Red-edge and NIR bands of S2/MSI [38], but these changes are rarely named differently. This nomenclature has already been partially modified to Normalized Difference Red-Edge (NDRE), being referred to as the previous NDVIre formula [86] or to the formula (RE2 \(-\) RE1)/(RE2 \(+\) RE1) and its variation NDRE2, formula (RE3 \(-\) RE1)/(RE3 \(+\) RE1), both formulations recently applied to LULC classifications [40; 61; 169; 152]. The VI represented by the mathematical expression 'NIR/Green--1', developed by [PERSON] et al. [181], was already named Chlorophyll Index Green (CIGreen) [38; 168] and Green Chlorophyll Vegetation Index (GCVI) [182; 13]. Additionally, the type of approach causes differences in VIs that uses the S2/MSI NIR and visible bands. When the VI is derived from a dense time series approach combining S2/MSI and L8/OLI and resample procedures, the narrower S2/MSI NIR band 8A (855-875 nm) is more recommended, as it is more comparable to the L8/OLI NIR band 5 (851-879 nm) [42; 66; 111; 123]. When only S2/MSI bands are used, the broad S2/MSI NIR band 8 (785-900 nm) is more recommended because 8A has a different spatial resolution (20 m) from the visible bands (10 m) [64; 65; 93; 166; 183]. This issues makes it necessary to revisit previous studies before choosing a VI correspondent with the research objectives.