| Value | Category | Cases | |
|---|---|---|---|
| 1 | flat | 126 |
74.1%
|
| 2 | gentle slope | 21 |
12.4%
|
| 3 | steep slope | 3 |
1.8%
|
| 4 | valley | 20 |
11.8%
|
| Sysmiss | 53 |