## 4 Results
### Soil Salinity Severity Classification and Land Use  
The overlay analysis between soil salinity severity classification of two measuring modes and land use data of LDD in 2015 [69] is reported in Table 21.  
From the HH measuring mode data in Table 21, the top three dominant land use types in the slightly saline and moderately saline classes are paddy fields, field crops, and urban and built-up areas. They cover about 120.97, 46.48, and 12.90 sq. km, respectively. Likewise, the top three dominant land use types in the strongly saline and very strongly saline classes are paddy fields, field crops, and urban and built-up areas. They cover about 226.57, 58.70, and 17.63 sq. km, respectively. Additionally, soil salinity severity classification of the HH measuring mode in salt flats consists of moderately saline, strongly saline, and very strongly saline.  
\begin{table}
\begin{tabular}{l c c c c c c} \hline \hline \multirow{2}{*}{**Land Use Type**} & \multicolumn{6}{c}{**Soil Salinity Severity Class**} \\ \cline{2-7}  & **Non-** & **Slightly** & **Moderately** & **Staine** & **Strongly** & **Very Strongly** \\  & **Saline** & **Saline** & **Saline** & **Saline** & **Saline** \\ \hline \hline \multicolumn{7}{c}{**HH measuring mode**} \\ \hline Urban and built-up area & 1.0796 & 2.4163 & 10.4877 & 8.1485 & 9.4852 & 31.6172 \\ Paddy field & 12.5358 & 21.8864 & 99.0794 & 93.1968 & 133.3732 & 360.0717 \\ Field crops & 0.5447 & 7.2369 & 39.2451 & 18.8055 & 39.8936 & 105.7258 \\ Perennial trees & 0.3073 & 0.3073 & 0.7244 & 0.3073 & 0.8122 & 2.4587 \\ Orchards & 0.0236 & 0.0236 & 0.5422 & 0.4008 & 0.1179 & 1.108 \\ Fish/shrimp farm & 0.0480 & 0.1201 & 0.4323 & 0.5524 & 0.6244 & 1.7772 \\ Other agricultural lands & 0.4417 & 0.4970 & 1.2148 & 0.5522 & 0.8007 & 3.5063 \\ Forest land & 0 & 0.9130 & 0.3701 & 0.0000 & 1.0611 & 2.3442 \\ Salt flat & 0 & 0 & 0.0513 & 0.6415 & 1.4370 & 2.1298 \\ Water bodies & 0.1526 & 1.1442 & 3.4579 & 2.8986 & 4.9581 & 12.6113 \\ Miscellaneous land & 0.3157 & 2.0258 & 9.8397 & 4.8935 & 6.1564 & 23.2311 \\ Total & 15.4491 & 36.5704 & 165.4450 & 130.3971 & 198.7196 & 546.5813 \\ \hline \hline \multicolumn{7}{c}{**VV measuring mode**} \\ \hline Urban and built-up area & 0.092 & 0.691 & 2.694 & 8.912 & 19.228 & 31.6172 \\ Paddy field & 0.1272 & 1.0175 & 32.7559 & 84.7629 & 241.4083 & 360.0717 \\ Field crops & 0.1977 & 0.3139 & 10.9877 & 38.9743 & 55.2523 & 105.7258 \\ Perennial trees & 0.0789 & 0.1466 & 0.3384 & 0.8572 & 1.0376 & 2.4587 \\ Orchards & 0 & 0 & 0.1207 & 0.3291 & 0.6582 & 1.108 \\ Fish/shrimp farm & 0 & 0 & 0.1693 & 0.5078 & 1.1002 & 1.7772 \\ Other agricultural lands & 0.0112 & 0.2464 & 0.6385 & 0.9858 & 1.6243 & 3.5063 \\ Forest land & 0 & 0 & 0.9449 & 0.3349 & 1.0645 & 2.3442 \\ Salt flat & 0 & 0.0072 & 0.1079 & 0.2950 & 1.7197 & 2.1298 \\ Water bodies & 0 & 0.0460 & 1.0126 & 3.7397 & 7.8130 & 12.6113 \\ Miscellaneous land & 0.0345 & 0.1494 & 3.8719 & 6.0893 & 13.0862 & 23.2311 \\ Total & 0.5416 & 2.6179 & 53.6418 & 145.7876 & 343.9924 & 546.5813 \\ \hline \hline \end{tabular}
\end{table}
Table 21: Area of soil salinity severity classification in each land use type in the two measuring modes.  
Based on the VV measuring mode, the top three dominant land use types in the slightly saline and moderately saline classes are paddy fields, field crops, and miscellaneous land. They cover about 33.77, 11.30, and 4.02 sq. km, respectively. Similarly, the top three dominant land use types in strongly saline and very strongly saline classes are paddy fields, field crops, and built-up areas. They cover about 326.17, 94.23, and 28.14 sq. km, respectively. Soil salinity severity classifications of the VV measuring mode in salt flats are mainly moderately saline, strongly saline, and very strongly saline.