U.S. National Atlas Water Feature Areas represents the water feature areas (for example, bays, glaciers, lakes, and swamps) of the United States.
U.S. National Atlas Water Feature Areas provides the water feature areas for geographic display and analysis at regional and national levels.
Largest scale when displaying the data: 1:1,000,000.
ground condition
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The shapefile is converted to SDC (Smart Data Compression) format using either ESRI SDC Data Development Kit Professional 2 (DDKP2) or tools in ArcGIS. The SDC data set is then loaded into ArcSDE® to verify and validate the geometry.
After processing, the data set is checked for drawing display and number of records and file sizes compared with source materials. Data completeness generally reflects the content of the original Digital Line Graph (DLG) files.
The geospatial part of this data set was originally extracted from the individual 1:2,000,000-scale State boundary Digital Line Graph (DLG) files produced by the U.S. Geological Survey which have a positional accuracy of 1,720 meters. It was updated several times using various sources whose horizontal positional accuracies are unknown.
Attribute and geospatial data
This file was originally digitized by the National Mapping Division based on the sectional maps contained in 'The National Atlas of the United States of America®' published by the USGS in 1970. The 1:2,000,000-scale Digital Line Graph (DLG) data were merged into a single national hydrography coverage. Where necessary to effect the merge, alignment changes were made. The names were taken from the USGS Topographic 1:100,000-scale maps. For Alaska, the names were taken from the USGS Topographic 1:250,000-scale maps. State lines across water bodies were removed from the national coverage. State attributes were assigned to the features. Some spatial features were added and corrected. Some name attributes were added or corrected. All occurrences of St. were changed to Saint. Extra spaces were removed from the attributes. Hydrographic features for Puerto Rico and the U.S. Virgin Islands were added. A minor adjustment was made to the shoreline in Galveston Bay, Texas. The linear water feature attribute value, Intercoastal waterway, was changed to Intracoastal waterway.
The following steps were performed by ESRI: Downloaded the compressed file from the National Atlas of the United States® and extracted it. Removed unneeded attributes. Removed all records except those with FEATURE attribute types of "Canal", "Glacier", "Lake", "Lake Dry", "Lake Intermittent", "Reservoir", "Reservoir Intermittent", "Stream", and "Swamp or Marsh". Reduced the attribute widths of FEATURE and NAME. Added attribute SQMI and calculated its values. Created ArcGIS® layer file (.lyr), projection file (.prj), and spatial indices.
Internal feature number.
ESRI
Feature geometry.
ESRI
The type of water feature.
National Atlas of the United States and the United States Geological Survey
An artificial open waterway constructed to carry water, to irrigate or drain land, to connect two or more bodies of water, or to serve as a waterway for water craft.
National Atlas of the United States and the United States Geological Survey
A field of ice.
National Atlas of the United States and the United States Geological Survey
A standing body of water with a predominately natural shoreline surrounded by land.
National Atlas of the United States and the United States Geological Survey
An area that at one time contained a standing body of water.
National Atlas of the United States and the United States Geological Survey
A standing body of water that contains water for only part of the year.
National Atlas of the United States and the United States Geological Survey
A constructed basin formed to contain water.
National Atlas of the United States and the United States Geological Survey
A constructed basin formed to contain water for only part of the year.
National Atlas of the United States and the United States Geological Survey
A body of water flowing in a channel or watercourse.
National Atlas of the United States and the United States Geological Survey
A noncultivated, vegetated area that is inundated or saturated for a significant part of the year.
National Atlas of the United States and the United States Geological Survey
The water feature name.
National Atlas of the United States and the United States Geological Survey
The two-letter abbreviation for each state where the water feature is located.
Department of Commerce, National Institute of Standards and Technology
The area of the water feature in square miles.
ESRI
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See use constraints.
The SDC file contains the geospatial and attribute data. The SDI file contains the spatial index. The PRJ file contains the coordinate system information (optional). The XML file (*.sdc.xml) contains the metadata describing the data set (optional).
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