3D Hydrography Program 3DHP_all: HydroLocation
HydroLocation (hydrolocation) is a point spatial table that represents locations which lie along a flowline.
hydrolocationfeaturetype (domain)
hydrolocation (spatial table)- Hydro location is a point spatial table that represents locations which lie along a flowline and uses the hydrolocationfeaturetype domain.
| Name (Alias) | Definition | Type | Allow Nulls | Length | Domain | Default Values | Comments |
|---|---|---|---|---|---|---|---|
| id3dhp | Unique identifier for 3DHP features. | Text | Yes | 7 | - | - |
This is a base-36 7- digit alphanumeric unique identifier that is not persistent. Applied to hydrolocation features in this case. |
| featuredate | Date the feature was loaded into the 3DHP core database. | Date | Yes | - | - | - | - |
| mainstemid |
A cross-dataset identifier for all flowlines that represent the headwater to outlet path of a river. |
Text | Yes | 200 | - | - |
A mainstem is equivalent to a feature with the same levelpathid in NHDPlus HR. The text field will be a <geoconnex.us>*. |
| universalreferenceid | Persistent identifier appropriate for the hydrologic location type. | Text | Yes | 200 | - | - | - |
| gnisid |
A permanent, unique number assigned by the Geographic Names Information System (GNIS)** to a geographic feature name for the sole purpose of uniquely identifying that name. |
Long Integer | Yes | - | - | - |
gnisid = "null" if no name is associated with the feature. The gnisid is conflated from points and assigned to features. The most recent name, and any historic names, can be retrieved from the GNIS data base using the gnisid. |
| featuretype | Feature type description. | Short Integer | Yes | - |
hydro-locationtype |
- | - |
| featuretypelabel | The name of the feature type. | Text | Yes | 50 | - | - |
The featuretype label is based on the coded value description in the featuretype field. Allows label display in non-ESRI datasets. |
*More information about geoconnex can be found here: https://waterdata.usgs.gov/blog/nldi-geoconnex/.
**More information about GNISID can be found here: https://www.usgs.gov/tools/geographic-names-information-system-gnis.
hydrolocationfeaturetype (domain)- The hydrolocation spatial table uses the hydrolocationfeaturetype domain to classify the featuretype attribute.
| Code | Description | Definition |
|---|---|---|
| 1 | Catchment Outlet | The location where water flows out of a catchment. |
| 2 | Confluence | The location where two flowpaths converge. |
| 3 | Waterbody Outlet | The location where water flows out of a waterbody. |
| 4 | Divergence | The location where flow splits into two or more downstream flowlines. |
| 5 | Terminus | The location where a network ends at the ocean or large lake. |
| 6 | Headwater | The location where a river is thought to begin. |
| 7 | Spring | A place where water emerges naturally from the ground. |
| 8 | Sink | The location where a stream enters an underground conduit, terminates in an isolated sink or depression. Represents the low point to which water flows within a closed basin. |
| 9 | External Connection | The location where a stream enters a non-USGS authoritative source managed by another entity. |
| 10 | Reachcode Start | The location where a legacy National Hydrography Dataset (NHD) reachcode starts. |
| 11 | Reachcode End | The location where a legacy National Hydrography Dataset (NHD) reachcode ends. |