Elevation from the sea level
Classification structure
| Code | Title |
|---|---|
| 1 | Elevation less than 1 meter |
| 2 | Elevation less than 2.5 meters but more than 1 |
| 3 | Elevation less than 5 meters but more than 2.5 |
| 4 | Elevation less than 10 meters but more than 5 |
| 5 | Elevation less than 20 meters but more than 10 |
| 6 | Elevation more than 20 meters |
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