Elevation-Derived Hydrography READ Rules: EDH Feature type description, associated geometry, and use classification
EDH Feature type description, associated geometry, and use classification.
| Desc | FCode | Geometry type | EClass Domain value | EClass Feature Attribute | FClass Domain value | Feature Attribute |
|---|---|---|---|---|---|---|
| Artificial Path | 55800 | 3D line, polylineZ | 2 | Hydrographic feature used for elevation purposes, other than culverts or those used for hydroflattening | 1 | NHD feature (will be used for conflation). |
| Canal/Ditch | 33600 | 3D line, polylineZ (does not connect primary network features) | 0 | Not used for elevation derivatives | 2 | Non-NHD feature (outside of collection criteria). |
| Canal/Ditch | 33600 | 3D line, polylineZ (creates network connectivity) | 2 | Hydrographic feature used for elevation purposes, other than culverts or those used for hydroflattening | 1 | NHD feature (will be used for conflation). |
| Canal/Ditch | 33600 | 3D polygon, polygonZ | 1 | Used for hydroflattening | 1 | NHD feature (will be used for conflation). |
| Connector | 33400 | 3D line, polylineZ | 3 | Features below ground level. May be used for hydro-enforcement | 1 | NHD feature (will be used for conflation). |
| Connector: Culvert | 33401 | 3D line, polylineZ | 3 | Features below ground level. May be used for hydro-enforcement | 1 | NHD feature (will be used for conflation). |
| Connector: Indefinite Surface | 33404 | 3D line, polylineZ | 2 | Hydrographic feature used for elevation purposes, other than culverts or those used for hydroflattening | 1 | NHD feature (will be used for conflation). |
| Connector: Indefinite Surface | 33404 | 3D line, polylineZ | 0 | Not used for elevation derivatives | 1 | NHD feature (will be used for conflation). |
| Connector: Non-NHD Dataset | 33410 | 3D line, polylineZ | 0 | Not used for elevation derivatives | 1 | NHD feature (will be used for conflation). |
| Connector: Terrain Breach | 33405 | 3D line, polylineZ | 3 | Features below ground level. May be used for hydro-enforcement | 1 | NHD feature (will be used for conflation). |
| Dam/Weir | 34300 | 3D point, pointZ | 0 | Not used for elevation derivatives | 2 | Non-NHD feature (outside of collection criteria). |
| Dam/Weir | 34300 | 3D line, polylineZ | 0 | Not used for elevation derivatives | 1 | NHD feature (will be used for conflation). |
| Dam/Weir | 34300 | 3D polygon, polygonZ | 0 | Not used for elevation derivatives | 1 | NHD feature (will be used for conflation). |
| Drainageway | 46800 | 3D line, polylineZ | 2 | Hydrographic feature used for elevation purposes, other than culverts or those used for hydroflattening | 1 | NHD feature (will be used for conflation). |
| Ice Mass | 37800 | 3D polygon, polygonZ | 0 | Not used for elevation derivatives | 1 | NHD feature (will be used for conflation). |
| Lake/Pond | 39000 | 3D polygon, polygonZ | 1 | Used for hydroflattening | 1 | NHD feature (will be used for conflation). |
| Low-confidence Area (predetermined) | 991 | 3D polygon, polygonZ (accurate z-values not required) | 9 | Elevation dataset limitation | 9 | Nonhydrography feature (elevation dataset limitation). |
| Low-confidence Area (snow covered) | 993 | 3D polygon, polygonZ (accurate z-values not required) | 9 | Elevation dataset limitation | 9 | Nonhydrography feature (elevation dataset limitation). |
| Low-confidence Area (sparse bare earth) | 992 | 3D polygon, polygonZ (accurate z-values not required) | 9 | Elevation dataset limitation | 9 | Nonhydrography feature (elevation dataset limitation). |
| Pipeline | 42800 | 3D line, polylineZ (does not connect primary network features) | 0 | Not used for elevation derivatives | 1 | NHD feature (will be used for conflation). |
| Pipeline | 42800 | 3D line, polylineZ (creates network connectivity) | 2 | Hydrographic feature used for elevation purposes, other than culverts or those used for hydroflattening | 1 | NHD feature (will be used for conflation). |
| Playa | 36100 | 3D polygon, polygonZ | 0 | Not used for elevation derivatives | 1 | NHD feature (will be used for conflation). |
| Reservoir | 43600 | 3D polygon, polygonZ | 1 | Used for hydroflattening | 1 | NHD feature (will be used for conflation). |
| Sea/Ocean | 44500 | 3D polygon, polygonZ | 1 | Used for hydroflattening | 1 | NHD feature (will be used for conflation). |
| Sink/Rise | 45000 | 3D point, pointZ | 0 | Not used for elevation derivatives | 1 | NHD feature (will be used for conflation). |
| Stream/River | 46000 | 3D line, polylineZ | 2 | Hydrographic feature used for elevation purposes, other than culverts or those used for hydroflattening | 1 | NHD feature (will be used for conflation). |
| Stream/River | 46000 | 3D polygon, polygonZ | 1 | Used for hydroflattening | 1 | NHD feature (will be used for conflation). |
| Underground Conduit | 42002 | 3D line, polylineZ (creates network connectivity) | 0 | Not used for elevation derivatives | 1 | NHD feature (will be used for conflation). |