Figure 2

Field photos of the typical ground targets in the spring season. (a) The low structure houses are distributed in the village. (b) The wheat is planted in spring, while the corn is planted in summer. The picture is the wheat in the spring.
Field photos of the typical ground targets in the spring season. (a) The low structure houses are distributed in the village. (b) The wheat is planted in spring, while the corn is planted in summer. The picture is the wheat in the spring.