DCW Coverage and Database Item Naming Conventions
Coverage/Layer Names | Item (Attribute) Names | Layer Content Abbreviations | Feature Type Abbreviations
Coverage/Layer Names
A naming convention uniquely identifies each layer and each item within a layer. Particular layer and item names are identical for each tile. The layer naming convention uses a two digit identifier to specify the type of layer. This is followed by a specifier indicating the type of features in the layer. For instance the roads layer is named RDLINE. The RD for roads and the LINE for the feature type, obviously lines.
Item (Attribute) Names
The item names are uniquely identified by two characters representing the theme, two characters representing the type of feature it is associated with, and several characters describing the contents. For example, the "type" item in the political and oceans layer associated with lines is "POLNTYPE". The PO for the theme, the LN for lines, and the TYPE to describe the item. Likewise the item containing the populated place names is PPPTNAME (i.e., PP = populated places, PT = points, and name = name).
Layer Content Abbreviations
- AE Aeronautical
- CL Cultural landmarks
- DN Drainage
- DS Drainage, supplemental
- DQ Data quality
- HY Hypsography
- HS Hypsography, supplemental
- LC Land cover
- OF Ocean features
- PH physiography
- PO Political and ocean features
- PP Populated places
- RD Roads
- RR Railroads
- TS Transportation
- UT Utilities
- VG Vegetation
Feature Type Abbreveations
The first two letter abbreveation is used in item names. The Second full spelling of the feature type is used in coverage names. Since attributes are associated with points, polygons, or lines, there is no abbrevation associated with "Net" for item names.
- PT Point
- LN Line
- PY Poly
- ... Net (contains both line and polygon features)
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