Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1995
Title: 1:2,000,000-scale Digital Line Graphs - Hydrography
Publication_Information:
Publication_Place: Reston, Virginia
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2000000
Type_of_Source_Media: CD-ROM
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1972
Ending_Date: 1994
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: 2MILHY
Source_Contribution: spatial and attribute information
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1998
Title: Hydrography Features of the United States
Publication_Information:
Publication_Place: Reston, Virginia
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2000000
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1998
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: ATLASHY98
Source_Contribution: spatial and attribute information
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: unknown
Title: 1:100,000-scale USGS topographic sheets
Publication_Information:
Publication_Place: Reston, Virginia
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 100000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: unknown
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: 1:100,000-scale base maps
Source_Contribution: spatial and attribute information
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 199903
Title: Hydrography Features of the United States
Publication_Information:
Publication_Place: Reston, Virginia
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2000000
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: ATLASHY9903
Source_Contribution: spatial and attribute information
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: unknown
Title: 1:250,000-scale USGS topographic sheets for Alaska
Publication_Information:
Publication_Place: Reston, Virginia
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 250000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: unknown
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: 1:250,000-scale sheets
Source_Contribution: attribute information
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: unknown
Title: State base maps
Publication_Information:
Publication_Place: Reston, Virginia
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 500000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: unknown
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: State base maps
Source_Contribution: spatial and attribute information
Process_Step:
Process_Description: The 2MILHY data files were 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 1:100,000-scale
base maps. For Alaska, the names were taken from the 1:250,000-scale sheets. State lines
across water bodies were removed from the national coverage. State attributes were
assigned to the features.
Source_Used_Citation_Abbreviation: 2MILHY
Source_Used_Citation_Abbreviation: 1:100,000-scale base maps
Source_Used_Citation_Abbreviation: 1:250,000-scale sheets
Source_Used_Citation_Abbreviation: State base maps
Process_Date: 1998
Source_Produced_Citation_Abbreviation: ATLASHY98
Process_Step:
Process_Description: 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.
Source_Used_Citation_Abbreviation: 1:100,000-scale base maps
Source_Used_Citation_Abbreviation: State base maps
Source_Used_Citation_Abbreviation: ATLASHY98
Process_Date: 1999
Source_Produced_Citation_Abbreviation: ATLASHY9903
Process_Step:
Process_Description: A minor adjustment was made to the shoreline in Galveston Bay, Texas.
Source_Used_Citation_Abbreviation: ATLASHY9903
Source_Used_Citation_Abbreviation: 1:100,000 scale base maps
Process_Date: 1999