Put the following backscatter values in the correct order from low (top) to high (bottom).Water bodyForestUrban structureAgricultural field

To arrange the backscatter values from low to high based on typical characteristics of various land covers, we can consider the following general trends:

1. Water Body: Water has a low backscatter value because it smooths out radar waves. Thus, it typically reflects less energy back to the radar sensor.

2. Forest: Dense vegetation, such as forests, has moderate to low backscatter values due to the absorption and scattering of radar waves by the leaves and branches.

3. Agricultural Field: Agricultural fields often have a variable backscatter depending on the type of crop or if it's tilled or not, but they generally exhibit a slightly higher backscatter value than forests.

4. Urban Structure: Urban areas with buildings and infrastructure typically have the highest backscatter values due to the many surfaces that reflect radar waves.

Ordered List from Low to High Backscatter Values:

1. Water Body
2. Forest
3. Agricultural Field
4. Urban Structure

This sequence reflects the general understanding of backscatter characteristics for these land cover types.