All places in the Places API are categorized into one out of 9 feature classes (represented by letters) and further subcategorized into one out of 684 feature codes.
Feature Codes
| U: Undersea | ||
| Code | Short Description | Full Description |
|---|---|---|
| RFU | Reef | A surface-navigation hazard composed of consolidated material |
| RISU | Rise | A broad elevation that rises gently, and generally smoothly, from the sea floor |
| SCNU | Seachannel | A continuously sloping, elongated depression commonly found in fans or plains and customarily bordered by levees on one or two sides |
| SCSU | Seachannels | Continuously sloping, elongated depressions commonly found in fans or plains and customarily bordered by levees on one or two sides |
| SDLU | Saddle | A low part, resembling in shape a saddle, in a ridge or between contiguous seamounts |
| SHFU | Shelf | A zone adjacent to a continent (or around an island) that extends from the low water line to a depth at which there is usually a marked increase of slope towards oceanic depths |
| SHLU | Shoal | A surface-navigation hazard composed of unconsolidated material |
| SHSU | Shoals | Hazards to surface navigation composed of unconsolidated material |
| SHVU | Shelf valley | A valley on the shelf, generally the shoreward extension of a canyon |
| SILU | Sill | The low part of a gap or saddle separating basins |