Elevation-Derived Hydrography READ Rules: Low-Confidence Area, Sparse Bare Earth

Introduction contiuned...

Any criteria for “low confidence,” including how these areas shall be delineated, shall be established prior to the collection, and agreed upon by the data producer, the customer, and the U.S. Geological Survey National Geospatial Program. Low-confidence areas may overlap other hydrographic features.

Attribute/Attribute Value

Each feature requires domain codes to be entered into the attribute table for the feature class (EDH Feature type description, associated geometry, and use classification table). See “Field Definitions and Domain Values for Attributes” section for more information on EDH code definitions.

Representation Rules

When delineating a feature, it must be created with the appropriate geometry, either point, line, or polygon, which is determined by the size of the feature or the length along different axes of the feature (table 13).

Special conditions: none.

Table 13. Low-confidence Area, Sparse Bare Earth.

Data Extraction

Capture Conditions

Topology rules for adjacent features do not apply to low- confidence areas. For instance, they do not need to be snapped to adjacent features.

Attribute Information

FClass 9—Non-Hydrography Feature (elevation dataset limitation).

FCode 992—Low-confidence area, sparse bare earth.

EClass 9—Elevation dataset limitation.