Key:depth
| depth |
| Description |
|---|
| The depth of a feature, in metres. |
| Group: Properties |
| Used on these elements |
| Status: de facto |
| Tools for this tag |
|
Depth is a property referring to how deep a feature is according to charted depth, measured in metres. For shallow depths, such as some fords, a decimal value will be needed - e.g. 0.05 for 5 cm. In most cases, the depth of a feature in the ocean is referred to LAT (Lowest Astronomical Tide). For rivers, canals, and inland lakes this might be different. Rivers and canals with water level gauges will have a defined zero value where depths should be referred. For more background information, see Water Depth.
Seamarks
When depth=* is used with Seamarks, you may want to add these additional tags, which correspond to attributes from IHO S-57:
Source Quality (QUASOU)
| OSM Value | S-57 Index | S-57 Long Value |
|---|---|---|
| known | 1 | depth known |
| 2 | depth unknown - You should never use this value, just omit the depth=* tag | |
| doubtful | 3 | doubtful sounding |
| unreliable | 4 | unreliable sounding |
| no_bottom | 5 | no bottom found at value shown |
| least_depth_known | 6 | least depth known |
| least_depth_unknown | 7 | least depth unknown, safe clearance at value shown |
| not_surveyed | 8 | value reported (not surveyed) |
| not_confirmed | 9 | value reported (not confirmed) |
| maintained | 10 | maintained depth |
| not_maintained | 11 | not regularly maintained |
Accuracy (SOUACC)
| This field is a number, in metres, such as 0.6. The error is assumed to be positive and negative. The plus/minus character shall not be encoded. |
Exposition (EXPSOU)
| OSM Value | S-57 Index | S-57 Long Value |
|---|---|---|
| within_range | 1 | within the range of depth of the surrounding depth area |
| shoaler | 2 | shoaler than the range of depth of the surrounding depth area |
| deeper | 3 | deeper than the range of depth of the surrounding depth area |
Technique (TECSOU)
| OSM Value | S-57 Index | S-57 Long Value |
|---|---|---|
| echo | 1 | found by echo- sounder |
| sonar | 2 | found by side scan sonar |
| multi-beam | 3 | found by multi-beam |
| diver | 4 | found by diver |
| lead-line | 5 | found by lead-line |
| wire-drag | 6 | swept by wire-drag |
| laser | 7 | found by laser |
| acoustic | 8 | swept by vertical acoustic system |
| electromagnetic | 9 | found by electromagnetic sensor |
| photogrammetry | 10 | photogrammetry |
| satellite_imagery | 11 | satellite imagery |
| levelling | 12 | found by levelling |
| sonar | 13 | swept by side-scan sonar |
| computer_generated | 14 | computer generated |
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