| Value | Category |
|---|---|
| -99 | Observation not possible |
| -98 | |
| -95 | |
| 1 | Full wall, concrete |
| 2 | Full wall, metal |
| 3 | Full wall, platic |
| 4 | Full wall, grass |
| 5 | Full wall, burnt brick |
| 6 | Full wall, mud |
| 7 | half wall, concrete |
| 8 | half wall, metal |
| 9 | half wall, plastic |
| 10 | half wall, grass |
| 11 | half wall, burnt brick |
| 12 | half wall, mud |
| 13 | no wall |
| Sysmiss |