## 5 Results and Discussion
### Trends to Be Further Explored
#### 5.3.1 Less Frequently Used Spectral Bands and VIs
The combination NIR/first SWIR band (NIR-SWIR1)/(NIR+SWIR1) is named in the literature as Normalized Difference Infrared Index (NDII) [176], recently employed with this nomenclature [40; 150; 152]; LSWI also recently applied [114; 144; 159; 177], NDMI, recently applied [129; 153; 178], and the frequently used NDWI developed by [PERSON] [92]. NDWI is also the name of the VI developed by [PERSON] [99], which differs from the [PERSON]'s NDWI by using the Green band instead of SWIR. Similar to those, there is the Normalized Difference SWIR (NDSWIR) [179] and the Normalized Burn Ratio (NBR) used by [PERSON] et al. [40], which use the NIR with the second SWIR band. Combining only the SWIR bands, the Normalized Difference Village Index (NDTI) [180] has the same formula as the Normalized Burn Ratio-2 (NBR-2): (SWIR1-SWIR2)/(SWIR1+SWIR2), applied by [PERSON] et al. [153]. \begin{table}
\begin{tabular}{l l l l} \hline \hline
**Class/Parameter** & **Spectral Vegetation Indices** & **Attested by** \\ \hline Natural vegetation & NDVIre, MNDWI, SRI, ARI, Clire, & [PERSON] et al. (2015), [PERSON] et al. (2016), [PERSON] et al. (2017), [PERSON] et al. (2019), GEMI, NDBI, MIRBI, NDFI, NDMII & [PERSON] et al. (2018), [PERSON] et al. (2016), [PERSON] et al. (2019) \\ \hline Soybean & NDVIre, LSWI, GCVI, Clire, & [PERSON] et al. (2018), [PERSON] et al. (2018), [PERSON] et al. (2015), [PERSON] et al. (2020) \\  & MSRre, SWIRIndex, PSRI, S2 REP & [PERSON] et al. (2019), [PERSON] et al. (2019), [PERSON] et al. (2018) \\ \hline \multirow{2}{*}{Maize} & ISWI, RedSWIR, TVI, NDTI, NDVIre, GCVI, & [PERSON] et al. (2016), [PERSON] et al. (2019,2020), [PERSON] et al. (2018), [PERSON] et al. (2018), \\  & CRVIO, IRECI, S2 REP, Clre, Clredder, MSR, & [PERSON] et al. (2013), [PERSON] et al. (2019), [PERSON] et al. (2020) \\  & MSRre, MRCF, NDVIre,25 PI, REIP, PPR, NCRDI & \\ \hline Cotton & NDVIre, LSWI, Clgreen, TVI, STI, NDTI & [PERSON] et al. (2018), [PERSON] et al. (2018) \\ \hline Beetroot & AFRII 6, SIWSI, NDII, PVVR, mNDVI & [PERSON] et al. (2018), [PERSON] et al. (2019) \\ \hline Potato & REIP, CYI, Macconi, Datt1 & [PERSON] et al. (2018), [PERSON] et al. (2019) \\ \hline \multirow{2}{*}{Wheat} & NDVIre, NDVIre2, MSR, MRFRe, MSRredre, Clre, Clredder, & [PERSON] and [PERSON] (2016), [PERSON] et al. (2018), [PERSON] et al. (2019), \\  & PSRI, S2 REP, REIP, AVI, SIPI, PVR, mNDVI, GARI, VARIgreen & [PERSON] et al. (2019), [PERSON] et al. (2020), [PERSON] et al. (2018) \\ \hline \multirow{2}{*}{Barley} & Clredder, NDVIre, MSR, MSRredre, PSRI, S2 REP & [PERSON] et al. (2018), [PERSON] et al. (2019), [PERSON] et al. (2020) \\ \hline Alfalfa & Clredderre, NDVIre, Clire, MSR, MRFRe, MSRredre, LSWI & [PERSON] et al. (2019), [PERSON] et al. (2018), [PERSON] et al. (2018), [PERSON] et al. (2020) \\ \hline Millet & NDVIre, Clire, Clgreen, STI & [PERSON] et al. (2018), [PERSON] et al. (2018) \\ \hline \multirow{2}{*}{Sorghum} & NDVIre, MNDWI, Clgreen, TVI, Clire & [PERSON] et al. (2018), [PERSON] et al. (2018) \\ \hline Sunflower & NDVIre, PSRI, S2 REP, CIRR& SAVI/r\&re & [PERSON] et al. (2018), [PERSON] et al. (2019), [PERSON] et al. (2020) \\ \hline Rice & LSWI, NDVIre, RERFI, Clire, MNDWI & [PERSON] et al. (2018), [PERSON] et al. (2019), [PERSON] et al. (2019), [PERSON] et al. (2020) \\ \hline Sugar beet & RedSWIR, NDVIre & [PERSON] et al. (2016) [PERSON] and Belgiu (2016) \\ \hline \multirow{2}{*}{Bens and groundnuts} & NDVIre, MNDWI, PVR, REIP, GEMI, Datt3 mNDVI, VARIgreen & [PERSON] et al. (2018), [PERSON] et al. (2019) \\ \hline Tomato/Chili pepper & Clire, NDVIre1n, NDVIre2n, MSRre, MSRren & [PERSON] et al. (2020) \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Robustness of different and less frequent VIs to provide accurate mapping of different LULC classes.