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This data represents the map extent for current and historical USGS topographic maps for the United States and Territories, including 1 X 2 Degree, 1 X 1 Degree, 30 X 60 Minute, 15 X 15 Minute, 7.5 X 7.5 Minute, and 3.75 X 3.75 Minute. The grid was generated using ESRI ArcInfo GIS software.
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The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. NHD data was originally developed at 1:100,000-scale and exists at that scale for the whole country. This high-resolution NHD, generally developed at 1:24,000/1:12,000 scale, adds detail to the original 1:100,000-scale NHD. (Data for Alaska, Puerto Rico and the Virgin Islands was developed at high-resolution, not 1:100,000 scale.) Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water...
Tags: AS, Administrative watershed units, Administrative watershed units, American Samoa, Area of Complex Channels, All tags...
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The Geographic Names Information System (GNIS) is the Federal standard for geographic nomenclature. The U.S. Geological Survey developed the GNIS for the U.S. Board on Geographic Names, a Federal inter-agency body chartered by public law to maintain uniform feature name usage throughout the Government and to promulgate standard names to the public. The GNIS is the official repository of domestic geographic names data; the official vehicle for geographic names use by all departments of the Federal Government; and the source for applying geographic names to Federal electronic and printed products of all types.
Tags: AS, American Samoa, Antarctica, Antarctica, BGN, All tags...
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The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. NHD data was originally developed at 1:100,000-scale and exists at that scale for the whole country. This high-resolution NHD, generally developed at 1:24,000/1:12,000 scale, adds detail to the original 1:100,000-scale NHD. (Data for Alaska, Puerto Rico and the Virgin Islands was developed at high-resolution, not 1:100,000 scale.) Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water...
Tags: AS, Administrative watershed units, Administrative watershed units, American Samoa, Area of Complex Channels, All tags...
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The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. NHD data was originally developed at 1:100,000-scale and exists at that scale for the whole country. This high-resolution NHD, generally developed at 1:24,000/1:12,000 scale, adds detail to the original 1:100,000-scale NHD. (Data for Alaska, Puerto Rico and the Virgin Islands was developed at high-resolution, not 1:100,000 scale.) Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water...
Tags: AS, Administrative watershed units, Administrative watershed units, American Samoa, Area of Complex Channels, All tags...
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This data represents the map extent for current and historical USGS topographic maps for the United States and Territories, including 1 X 2 Degree, 1 X 1 Degree, 30 X 60 Minute, 15 X 15 Minute, 7.5 X 7.5 Minute, and 3.75 X 3.75 Minute. The grid was generated using ESRI ArcInfo GIS software.
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The Watershed Boundary Dataset (WBD) is a comprehensive aggregated collection of hydrologic unit data consistent with the national criteria for delineation and resolution. It defines the areal extent of surface water drainage to a point except in coastal or lake front areas where there could be multiple outlets as stated by the "Federal Standards and Procedures for the National Watershed Boundary Dataset (WBD)" "Standard" (https://pubs.usgs.gov/tm/11/a3/). Watershed boundaries are determined solely upon science-based hydrologic principles, not favoring any administrative boundaries or special projects, nor particular program or agency. This dataset represents the hydrologic unit boundaries to the 12-digit (6th level)...
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The Watershed Boundary Dataset (WBD) is a comprehensive aggregated collection of hydrologic unit data consistent with the national criteria for delineation and resolution. It defines the areal extent of surface water drainage to a point except in coastal or lake front areas where there could be multiple outlets as stated by the "Federal Standards and Procedures for the National Watershed Boundary Dataset (WBD)" "Standard" (https://pubs.usgs.gov/tm/11/a3/). Watershed boundaries are determined solely upon science-based hydrologic principles, not favoring any administrative boundaries or special projects, nor particular program or agency. This dataset represents the hydrologic unit boundaries to the 12-digit (6th level)...
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The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. NHD data was originally developed at 1:100,000-scale and exists at that scale for the whole country. This high-resolution NHD, generally developed at 1:24,000/1:12,000 scale, adds detail to the original 1:100,000-scale NHD. (Data for Alaska, Puerto Rico and the Virgin Islands was developed at high-resolution, not 1:100,000 scale.) Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water...
Tags: AS, Administrative watershed units, Administrative watershed units, American Samoa, Area of Complex Channels, All tags...
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The Geographic Names Information System (GNIS) is the Federal standard for geographic nomenclature. The U.S. Geological Survey developed the GNIS for the U.S. Board on Geographic Names, a Federal inter-agency body chartered by public law to maintain uniform feature name usage throughout the Government and to promulgate standard names to the public. The GNIS is the official repository of domestic geographic names data; the official vehicle for geographic names use by all departments of the Federal Government; and the source for applying geographic names to Federal electronic and printed products of all types.
Tags: AS, American Samoa, Antarctica, Antarctica, BGN, All tags...
The geomorphic effectiveness of extreme floods increases with aridity and decreasing watershed size. Therefore, in small dry watersheds extreme floods should control the age structure and spatial distribution of populations of disturbance-dependent riparian trees. We examined the influence of extreme floods on the bottomland morphology and forest of ephemeral streams in a semiarid region. Along six stream reaches on the Colorado Piedmont we examined channel changes by analyzing a rectified sequence of aerial photographs spanning 56 yr, and we investigated the spatial distribution of different-aged patches of forest by aging 189 randomly sampled cottonwood trees. Channel change in these ephemeral sand-bed streams...
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The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. NHD data was originally developed at 1:100,000-scale and exists at that scale for the whole country. This high-resolution NHD, generally developed at 1:24,000/1:12,000 scale, adds detail to the original 1:100,000-scale NHD. (Data for Alaska, Puerto Rico and the Virgin Islands was developed at high-resolution, not 1:100,000 scale.) Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water...
Tags: AS, Administrative watershed units, Administrative watershed units, American Samoa, Area of Complex Channels, All tags...
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The Geographic Names Information System (GNIS) is the Federal standard for geographic nomenclature. The U.S. Geological Survey developed the GNIS for the U.S. Board on Geographic Names, a Federal inter-agency body chartered by public law to maintain uniform feature name usage throughout the Government and to promulgate standard names to the public. The GNIS is the official repository of domestic geographic names data; the official vehicle for geographic names use by all departments of the Federal Government; and the source for applying geographic names to Federal electronic and printed products of all types.
Tags: AS, American Samoa, Antarctica, Antarctica, BGN, All tags...


map background search result map search result map USGS Watershed Boundary Dataset (WBD) for 2-digit Hydrologic Unit - 22 (published 20230525) Shapefile USGS National Boundary Dataset (NBD) in American Samoa State or Territory (published 20240215) FileGDB USGS National Boundary Dataset (NBD) in American Samoa State or Territory (published 20240215) Shapefile USGS National Map Index Names (published 20240120) Shapefile USGS National Map Index Names (published 20240120) FileGDB USGS National Transportation Dataset (NTD) for American Samoa (published 20240215) FileGDB USGS National Structures Dataset (NSD) American Samoa (published 20240215) FileGDB USGS National Hydrography Dataset Best Resolution (NHD) for Hydrological Unit (HU) 8 - 22030001 (published 20240105) FileGDB USGS National Hydrography Dataset Best Resolution (NHD) - American Samoa (published 20231227) Shapefile USGS National Hydrography Dataset Best Resolution (NHD) for Hydrological Unit (HU) 4 - 2203 (published 20231213) FileGDB USGS National Hydrography Dataset Best Resolution (NHD) - American Samoa (published 20231227) GeoPackage USGS National Structures Dataset (NSD) American Samoa (published 20240215) GeoPackage USGS National Transportation Dataset (NTD) for American Samoa (published 20240215) GeoPackage USGS National Boundary Dataset (NBD) in American Samoa State or Territory (published 20240215) GeoPackage USGS National Hydrography Dataset Best Resolution (NHD) for Hydrological Unit (HU) 8 - 22030001 (published 20240105) GeoPackage USGS Watershed Boundary Dataset (WBD) for 2-digit Hydrologic Unit - 22 (published 20230525) GeoPackage Geographic Names Information System (GNIS) Full Model for AS (published 20240608) FileGDB Geographic Names Information System (GNIS) Federal Codes for AS (published 20240201) pipes Geographic Names Information System (GNIS) Domestic Names for AS (published 20240201) pipes USGS National Hydrography Dataset Best Resolution (NHD) for Hydrological Unit (HU) 8 - 22030001 (published 20240105) FileGDB USGS National Hydrography Dataset Best Resolution (NHD) for Hydrological Unit (HU) 8 - 22030001 (published 20240105) GeoPackage USGS National Boundary Dataset (NBD) in American Samoa State or Territory (published 20240215) FileGDB USGS National Boundary Dataset (NBD) in American Samoa State or Territory (published 20240215) Shapefile USGS National Map Index Names (published 20240120) Shapefile USGS National Map Index Names (published 20240120) FileGDB USGS National Transportation Dataset (NTD) for American Samoa (published 20240215) FileGDB USGS National Structures Dataset (NSD) American Samoa (published 20240215) FileGDB USGS National Hydrography Dataset Best Resolution (NHD) - American Samoa (published 20231227) Shapefile USGS National Hydrography Dataset Best Resolution (NHD) - American Samoa (published 20231227) GeoPackage USGS National Structures Dataset (NSD) American Samoa (published 20240215) GeoPackage USGS National Transportation Dataset (NTD) for American Samoa (published 20240215) GeoPackage USGS National Boundary Dataset (NBD) in American Samoa State or Territory (published 20240215) GeoPackage Geographic Names Information System (GNIS) Full Model for AS (published 20240608) FileGDB Geographic Names Information System (GNIS) Federal Codes for AS (published 20240201) pipes Geographic Names Information System (GNIS) Domestic Names for AS (published 20240201) pipes USGS National Hydrography Dataset Best Resolution (NHD) for Hydrological Unit (HU) 4 - 2203 (published 20231213) FileGDB USGS Watershed Boundary Dataset (WBD) for 2-digit Hydrologic Unit - 22 (published 20230525) Shapefile USGS Watershed Boundary Dataset (WBD) for 2-digit Hydrologic Unit - 22 (published 20230525) GeoPackage