The survey leader has to decide an appropriate contour interval for his project before start of survey work. The following factors govern the selection of contour interval for a project:
| S.No | Factor | Select High CI like 1m, 2m, 5m or more | Select Low CI like 0.5m, 0.25m, 0.1m or less |
| 1 | Nature of ground | If the ground has large variation in levels, for instance, hills and ponds | If the terrain is fairly level |
| 2 | Scale of the map | For small scale maps covering a wide area of varying terrain | For large scale maps
showing details of a small area |
| 3 | Extent of survey | For rough topographical map
meant for initial assessment only |
For preparation of detailed map for execution of work |
| 4 | Time and resources
available |
If less time and resources are
available |
If more time and resources are available |
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i personaly apreciate the notes, they are good
it is interesting notes ,continue pls