
The Water Body Shoreline (WS) layer consists of one or more representations of the shoreline of each water body. One representation of the shoreline for each water body will be flagged in the Framework database as the "default" shoreline. This default shoreline will be coincident with the water body perimeter in the water body (WB) layer. This layer is modeled in the Framework to accommodate those instances where multiple shorelines based on different datum (e.g. mean high water, mean low water etc.) are useful, especially marine shorelines. This layer is modeled as a routed linear feature. Water will be on the right side of each route and each shoreline will be represented by one or more non-overlapping routes. However, most simple water bodies (e.g. small lakes and ponds) will likely be represented by a single route. The history of spatial edits to each water body will be stored as an event on the route(s) on the default shoreline. Our agreement is that unless there is good justification to do so, all other shoreline attributes will be stored as events on the default shoreline. Non-default shorelines are intended to accommodate specialized requirements.
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 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.
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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