Freshwater Atlas (Data Key)

 

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Key to the FWA Datasets in the BCGW

This key contains brief descriptions of FWA data available from the BCGW (British Columbia Geographic Warehouse). For information on accessing FWA data please refer to Data Access

BCGW Cryptic Name
Brief Description

Point Data

Named point features (both fresh and marine) such as points of land, etc. Point names included as an attribute.
Water obstacles (rapids, falls, etc). 

Line Data

All bank edges (of rivers, lakes, and wetlands), delimiter edges, glacier edges, and administrative boundary edges. These are the linear features that makeup the polygonal water bodies. 
All principal and non-principal watershed boundary edges. These are the linear features that makeup the watershed polygons. 
Linear coastlines of BC, including mainland and marine islands. Lines are directionalized and connected. Attributes include a hierarchical key and route identifier.
Flow network arcs (observed, inferred and constructed). Contains no banks, coast or watershed boundary arcs. Directionalized and connected. Contains hierarchical key and route identifier. 

Polygonal Data

All fundamental watershed polygons generated from watershed boundary lines, bank edges, delimiter edges, coastline edges, and administrative boundary edges. 
All wetland polygons for the province.
Bay and Channel (fresh and marine) features and associated names. 
Glaciers and ice masses for the province. 
All named watershed polygons. 
All double line river polygons for the province. 
All island polygons. Islands may overlap as there are islands within islands. 
Assessment Watersheds are mesoscale aquatic units designed to replace the 3rd order 1:50K watersheds. Assessment Watersheds are based on groupings of fundamental watersheds using FWA watershed code and local code, with a target size of between 2,000ha and 10,000ha. 
Polygons delimiting the watershed group boundary, which is a collections of drainage areas. In-land groups will contain a single polygon, coastal groups may contain multiple polygons (one for each island). 
fwa All manmade water bodies, including reservoirs and canals, for the province. 
All lake polygons for the province. 

Data Table

Links the edge type codes used in the stream network layer with an English description used to categorize stream network features. 
Lookup table for watershed type codes 
Contains all primary and secondary matches between 1:20K and 1:50K stream edges. This attribute table links the new Freshwater Atlas watershed codes with the existing 1:50K Watershed Atlas watershed codes for cross reference purposes. 
Links the water body type codes used in the water body layers with an English description used to categorize water body features. 
Contains all primary and secondary matches between 1:20K and 1:50K water body polygons. This attribute table links the new Freshwater Atlas watershed codes with the existing 1:50K Watershed Atlas watershed codes for cross reference purposes. 

 





 

 

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