
Generalized procedures for constructing 100K scale Banks coverages: 1. Read 100K hydrography DLGs for each map into GIS. 2. Edgematch north and west edges of each map to adjacent 100K quads. 3. CLIP each 100K quad with adjusted Hydrologic Unit boundary. 4. APPEND clipped quad pieces together. 5. Correct internal node errors using automated snapping. 6. Remove non-attributed pseudo nodes. 7. Copy polygons to Waterbody coverage. 8. Edit out double-banked streams, shorelines, and braided areas and put into Water bodies coverage. 1. Read 100K hydrography DLG's for each map into GIS. 2. Edgematch north and west edges of each map to adjacent 100K quads. 3. CLIP each 100K quad with adjusted Hydrologic Unit boundary. 4. APPEND clipped quad pieces together. 5. Correct internal node errors using automated snapping. 6. Remove non-attributed pseudo nodes. 7. Copy polygons to Waterbody coverage. 8. Edit out double-banked streams, shorelines, and braided areas and put into Water bodies coverage.
The framework processing procedures were:
1. verifying the DLG water body type codes for each polygon 2. assigning the GNIS feature name to water body polygons 3. assigning a unique Lat/Long identifier to each water body polygon (including islands) 4. building routes on the shorelines for water bodies of types 101, 115, 116, and 421. 5. calculate indexes on the routed water body shorelines in a clockwise direction from the southernmost point on the shoreline 6. calculate an index for the main marine shoreline starting at Point Roberts and continuing southward to the Columbia River
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