1 Subjects: “...normalized difference vegetation index...”

2 Subjects: “...functional differences...”

3 Subjects: “...different working conditions...”

4 Subjects: “...explicit finite difference...”

5 Subjects: “...different altitudes...”

6 Subjects: “...different drivers...”

7 Subjects: “...different loading directions...”

8 Subjects: “...co-polarized phase difference...”

9 Subjects: “...finite difference time domain...”

10 Subjects: “...different scenarios...”

11 Subjects: “...different batteries...”

12 Subjects: “...phase difference angle...”