Data
Inputs
| Layer | Data Type | Description | Source |
|---|---|---|---|
| dem_hillshade | GeoTiff | Hillshade derived from DEM | Riverscapes Context |
| dem | Digital Elevation Model | GeoTiff | Riverscapes Context |
| igo | Geopackage Feature Class | VBET integrated geographic object (IGO) points | VBET |
| dgo | Geopackage Feature Class | VBET discrete geographic object (DGO) polygons | VBET |
| flowlines | Geopackage Feature Class | The NHD flow lines previously intersected with land ownership, road and rail | VBET |
Data Layers Produced by Hydrologic Context
Outputs
Hydrologic IGO Point Geometry
Integrated Geographic Objects - Points placed at a specified distance interval along the valley centerline. This distance is a function of the average valley width for a given stream.Hydrologic Output Points
IGOs attributed with values for hydrology calculated within a single DGO or an aggregation of DGOs.Hydrologic Reach Geometry
NHD Flowlines that have been intersected with land ownership, road and rail.Hydrologic Output Lines
NHD Flowlines attributed with values for physical characteristics and hydrology.Hydrologic Output DGOs Polygons
Discrete Geographic Objects - The valley bottom split into a sampling frame of polygons where the IGO points are at the center of each polygon.Hydrologic Output DGOs
DGOs attributed with values for physical stream characteristics and hydrology within the DGO extent.Output Attributes
Hydrologic Context Lines (vwReaches)
| Field | Units | Description |
|---|---|---|
ReachID | NA | Unique identifier for each reach |
FCode | NA | NHD FCode representing flow type |
ReachCode | NA | NHD Reach Code identifier |
NHDPlusID | NA | Unique NHDPlus ID used to join additional value added attributes |
StreamName | NA | The name of the stream |
level_path | NA | A unique identifier from NHD for each stream from headwaters to outlet |
TotDASqKm | km2 | Total upstream contributing drainage area |
DivDASqKm | km2 | Contributing drainage area accounting for flow partitioning into canals, side channels, etc. |
WatershedID | NA | 10-Digit USGS hydrologic unit code (HUC) |
ownership | NA | land owner/administrator of the area line intersects |
divergence | NA | An integer code from NHD attributes indicating channel divergence and type of divergence |
stream_order | NA | Strahler stream order from NHD attributes |
us_state | NA | The state in which the reach is located |
ecoregion_iii | NA | Level III ecoregion from the EPA |
ecoregion_iv | NA | Level IV ecoregion from the EPA |
ElevMax | m | Maximum elevation along the stream reach |
ElevMin | m | Minimum elevation along the stream reach |
Length_m | m | Length of the reach |
Slope | unitless | Slope of the reach; '(ElevMax - ElevMin) / Length_m' |
DrainArea | km2 | Upstream contributing drainage area of the reach |
QLow | ft3/sec | Low flow discharge |
Q2 | ft3/sec | Typical flood (2-year recurrence interval) discharge |
SPLow | W | Low flow stream power |
SP2 | W | Typical flood (2-year recurrence interval) stream power |
Hydrologic Context DGOs (vwDgos)
| Field | Units | Description |
|---|---|---|
DGOID | NA | Unique identifier for each DGO polygon |
FCode | NA | NHD FCode representing flow type of the primary channel in the polygon |
level_path | NA | A unique identifier for the primary stream within the polygon from headwaters to outlet |
seg_distance | m | Distance downstream along a given level path of the feature |
centerline_length | m | Total valley length of the polygon |
segment_area | m2 | Area of the polygon |
ElevMax | m | Maximum elevation along the stream reach within the polygon |
ElevMin | m | Minimum elevation along the stream reach within the polygon |
Length_m | m | Length of the reach within the polygon |
Slope | unitless | Slope of the reach within the polygon; '(ElevMax - ElevMin) / Length_m' |
DrainArea | km2 | Upstream contributing drainage area of the reach |
QLow | ft3/sec | Low flow discharge |
Q2 | ft3/sec | Typical flood (2-year recurrence interval) discharge |
SPLow | W | Low flow stream power |
SP2 | W | Typical flood (2-year recurrence interval) stream power |
Hydrologic Context IGOs (vwIgos)
| Field | Units | Description |
|---|---|---|
IGOID | NA | Unique identifier for each IGO point |
seg_distance | m | Distance downstream along a given level path of the feature |
stream_size | NA | Categorical classification of stream size based on drainage area from 0 small to 4 large |
FCode | NA | NHD FCode representing flow type of the primary channel in the window |
level_path | NA | A unique identifier for the primary stream within the window from headwaters to outlet |
ElevMax | m | Maximum elevation along the stream reach within the window |
ElevMin | m | Minimum elevation along the stream reach within the window |
Length_m | m | Length of the reach within the window |
Slope | unitless | Slope of the reach within the window; '(ElevMax - ElevMin) / Length_m' |
DrainArea | km2 | Upstream contributing drainage area of the reach |
QLow | ft3/sec | Low flow discharge |
Q2 | ft3/sec | Typical flood (2-year recurrence interval) discharge |
SPLow | W | Low flow stream power |
SP2 | W | Typical flood (2-year recurrence interval) stream power |