WaterHydro_VHD

Metadata also available as

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: VT Center for Geographic Information
Publication_Date: 20080806
Publication_Time: Unknown
Title: WaterHydro_VHD
Edition:
2.0; Contains NHDGEOinSHP formatted "certified" National Hydrography Dataset features.
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: The Vermont Hydrography Dataset RF 5,000 scale
Issue_Identification:
2008A Certification pending release of surface water by Subbasin
Publication_Information:
Publication_Place: Waterbury VT 05676
Publisher: VT Center for Geographic Information
Other_Citation_Details:
Tiling Structure - subbasin (4th level, a.k.a., 8 digit Cataloging Unit)
Online_Linkage:
<http://www.vcgi.org/pub/dataware/gisdata/layers_vcgi/WaterHydro_VHD.zip>
Online_Linkage:
<ftp://ftp.horizon-systems.com/NHDPlus/documentation/metadata.xml>
Online_Linkage: <http://pubs.usgs.gov/sir/2006/5217/pdf/SIR2006-5217_report.pdf>
Larger_Work_Citation:
Citation_Information:
Title: National Hydrography Dataset: Http://NHD.usgs.gov/
Description:
Abstract:
The Vermont Hydrography Dataset (VHD) is compliant with the local resolution National Hydrography Dataset (NHD) and 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. Data users are highly encouraged to read this metadata thoroughly in order to avoid using the data beyond its limitations.
The Value Added Attributes (VAAs) and "Hydrographic Category", i.e., "intermittent" vs. "perennial", data have now been integrated into the VHD. Please refer to the "NHDPlus" and "SIR2006-5217_report.pdf" Online links above for more information.
The VHD is based primarily on the Vermont Mapping Program (VMP) digital orthophotos, vmp "break line" features, and to a lesser degree on historical surface water data, NAPP cir multi-spectral aerial photography and CIR satellite imagery (lamoille and white subbasins only). The original VMP orthos had source dates ranging from 1994-2000 and these are being updated yearly.
The VHD is organized at the subbasin level, a.k.a., the eight digit cataloging unit (HUC 8). The 17 Subbasins within or intersecting Vermont include: Black-Ottauquechee Rivers (1080106), Connecticut-Bellows Falls to Vernon Dam (1080107), Connecticut-Johns River to Waits River (1080103), Connecticut-Waits River to White River (1080104), Deerfield River (1080203), Hudson-Hoosic Rivers (2020003), Lake Champlain (2010008), Lake George (2010001), Lamoille River (2010005), Middle Connecticut River (1080201), Mississquoi River (2010007), Otter Creek (2010002), Passumpsic River (1080102), St. Francois River (1110000), Upper Connecticut River (1080101), White River (1080105) and Winooski River (2010003).
The Hydro Event Management (HEM) Tools are a useful set of ArcView 9.x tools for managing event data created by the PNW Hydrography Framework (PNWHF) Partners. These tools are designed to support the creation, management, and refresh of event data that is referenced to stream data in the NHD format. For more information go to their website - <http://hydro.reo.gov/redesign.html>. Tools Overview - <http://hydro.reo.gov/documentation/HEM_Overview.pdf>. User Guide - <http://hydro.reo.gov/documentation/HEM_User_Guide_MSWord.zip>
Purpose:
The NHD is a national framework for assigning reach addresses to water-related entities, such as industrial discharges, drinking water supplies, fish habitat areas, wild and scenic rivers. Reach addresses establish the locations of these entities relative to one another within the NHD surface water drainage network much like addresses on streets. Once linked to the NHD by their reach addresses, the upstream/downstream relationships of these water-related entities--and any associated information about them--can be analyzed using software tools ranging from spreadsheets to geographic information systems (GIS).
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19940101
Beginning_Time: unknown
Ending_Date: 20000101
Ending_Time: unknown
Currentness_Reference: publication date
Status:
Progress: In work
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -73.742710
East_Bounding_Coordinate: -71.464335
North_Bounding_Coordinate: 45.059295
South_Bounding_Coordinate: 42.559606
Keywords:
Theme:
Theme_Keyword_Thesaurus:
U.S. Department of the Interior, U.S. Geological Survey,1999,Standards for National Hydrography Dataset (<http://mapping.usgs.gov/standards/>)
Theme_Keyword: Vermont Hydrography Dataset
Theme_Keyword: VHD
Theme_Keyword: Surface Waters
Theme_Keyword: FWHYDROGRAPHY
Theme_Keyword: Hydrography
Theme_Keyword: Stream / River
Theme_Keyword: Lake / Pond
Theme_Keyword: Canal / Ditch
Theme_Keyword: Reservoir
Theme_Keyword: Spring / Seep
Theme_Keyword: Swamp / Marsh
Theme_Keyword: Artificial Path
Theme_Keyword: Reach
Place:
Place_Keyword_Thesaurus:
U.S. Department of Commerce, 1977, Countries, dependencies, areas of special sovereignty, and their principal administrative divisions (Federal Information Processing Standards 10-3): Washington, D.C., National Institute of Standards and Technology.
Temporal:
Temporal_Keyword_Thesaurus: None
Temporal_Keyword: <add year here>
Access_Constraints:
VCGI and the State of VT make no representations of any kind, including but not limited to the warranties of merchantability or fitness for a particular use, nor are any such warranties to be implied with respect to the data.
Use_Constraints:
None. Acknowledgment of the originating agencies would be appreciated in products derived from these data. This data constitutes the best available surface water data of its kind to date, available at the subbasin level. However, this does not ensure absolute accuracy of all features and the user must be alert to potential errors at all times when using data for cartographic display or analytical purposes.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: VT Center for Geographic Information
Contact_Position: NHD Project Manager
Contact_Address:
Address_Type: Mailing and Physical Address
Address: 58 South Main Street, Suite 2
City: Waterbury
State_or_Province: VT
Postal_Code: 05676
Country: USA
Contact_Voice_Telephone: 802/882-3000
Contact_TDD/TTY_Telephone: None
Contact_Facsimile_Telephone: 802/882-3001
Contact_Electronic_Mail_Address: info@vcgi.org
Hours_of_Service: 9am - 5pm, M-F
Browse_Graphic:
Browse_Graphic_File_Name:
<http://maps.vcgi.org:8080/wmsconnector/com.esri.wms.Esrimap?servicename=DATAWARE_VCGI&VERSION=1.1.1&request=getmap&BBOX=-73.45416,42.72279,-71.46528,45.018356&SRS=EPSG:4326&LAYERS=>&WIDTH=300&HEIGHT=400&FORMAT=image/gif
Browse_Graphic_File_Description: GIF
Browse_Graphic_File_Type: GIF
Data_Set_Credit:
Generated by VCGI through cooperative agreements with the USGS Innovative partnership program, the VT Agency of Natural Resources and Vermont regional planning commissions, e.g., the Addison County RPC and the Lamoille County Planning Commission.
Security_Information:
Security_Classification_System: N/A
Security_Classification: Unclassified
Security_Handling_Description: No Security Considerations
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.4.1420
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
"CERTIFIED" NHD DATA: Feature types, characteristics, and other attributes conform to the Standards for NHD (USGS, 1999) as of the date they were loaded into the database. All names on reaches were validated against latest available data from the Geographic Names Information System. The entry and identifier for the names match those in the Geographic Names Information System. The association of each name to reaches has not been methodically checked, and so a name may be applied to the wrong reach. Anecdotal reviews indicate that 80 percent or more of the named reaches have the correct name. Reaches were delineated with a batch procedure and were checked extensively during the visual pass steps of processing. Based on automated quality assurance/quality control checks performed at various intervals during the processing, approximately 99 percent of the reaches are delineated according to standards.
Logical_Consistency_Report:
Points, nodes, lines, and areas conform to topological rules. Lines intersect only at nodes, and all nodes anchor the ends of lines. Lines do not overshoot or undershoot other lines where they are supposed to meet. There are no duplicate lines. Lines bound areas and lines identify the areas to the left and right of the lines. Gaps and overlaps among areas do not exist. All areas close. Network lines exist within all two dimensional "2d" features to ensure "hydrologic connectivity" from headwater reaches to receiving waters through the network of single line "1d", and "2d" rivers and lakes. "Dummy" lines separate polygonal rivers from lakes and exist nowhere else.
Completeness_Report:
This data layer is based on the best available surface water data across the state and has been enhanced via on-screen digitizing with the aid of photo-interpreting RF 5,000 scale orthophotos, derived contours and multi-spectral aerial photographs. It has not been subject to field checking. River and lakeshore features are seasonal and have been interpreted at the feature's position as of the date of the source photos. The best available surface water data sources include layers from VCGI, Regional Planning Commissions, Town GIS offices, USGS DLG, Regional projects (i.e., NFLRI, VBP etc.) and more. Standardized delineation methodologies were followed throughout the compilation of this data providing a high degree of consistency.
No wetlands were delineated in this effort per se, however, all open water features were captured and these may be coincident with wetland features. Distinct wetland features may be integrated at a latter date if the data becomes available. All surface water polygons and "2d" streams have "network" lines to ensure hydrologic connectivity (flow direction) from headwaters to receiving waters, i.e., Lake Champlain. All streams that flow from a lake were collected regardless of their length. Lake/ponds having an area as small as .02 acres have been delineated. National Aerial Photography Program (NAPP) color infrared photos (1992) were enlarged to RF 20,000 scale and used along with USGS 7.5' quads as secondary source material. River and lake names present in source data have been preserved as have the VT ANR water body IDs. Streams or rivers were not collected from the CIR photos, only ponds. This was also done for water bodies that were manmade, i.e., sewage lagoons. All upland polygons were identified and coded to create a complete network.
"CERTIFIED" NHD DATA: Transport reaches are defined on nearly all features of type: stream/river, canal/ditch, artificial path, pipeline, and connector. Waterbody reaches are defined on the subset of lake/pond features identified as water bodies. Geographic names, where present, were carried over from both 1:24k DLG hydrography data and from the best available source data. Near the international boundaries with Canada, only the parts of features within the United States are delineated. Detailed capture conditions are provided for every feature type in the Standards for NHD (USGS, 1999), available online through <http://mapping.usgs.gov/standards/>.>
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Compiled to meet 4.92 meters horizontal accuracy at 95% confidence level. Tested (value varies by subbasin-see below) meters horizontal accuracy at 95% confidence level. Subbasins are listed in the order they were pre-conflated.
Common Name 8Digit "CU" Horizontal Accuracy
White 01080105 9.48 m Lamoille 02010005 10.90 m St Francois 01110000 5.02 m Passumpsic 01080102 7.01 m Upper CT 01080101 2.23 m Winooski 02010003 5.21 m Deerfield 01080203 6.93 m Lake Champlain 02010008 4.82 m Otter Creek 02010002 4.37 m CT Rvr-BF to Vernon Dam 01080107 2.58 m Hudson-Hoosic 02020003 6.86 m Lake George 02010001 5.07 m CT-Waits Rvr to White Rvr 01080104 6.89 m CT-Johns Rvr to Waits Rvr 01080103 5.12 m Black - Ottauquechee 01080106 na Mississquoi 02010007 4.40 m Middle CT 01080201 na These values do not account for the error of the source digital orthophotos (approx. +/- 6 meters) on which the data is based. Horizontal accuracy was assessed by comparing 20 well defined "check" points of the source RF 5,000 scale digital orthophotos against derived surface water data. This approach is detailed in the FGDC Geospatial Positioning Accuracy Standards (<http://www.fgdc.gov/standards/projects/FGDC-standards-projects/accuracy/part3/chapter3>). Digitized data was overlaid upon the RF 5k scale digital orthophotos. Check points were assessed on-screen to determine the spatial difference between the delineated vector data features and the location of the features on the orthophotos. Check points are any combination of the following features: 1) Confluences of one dimensional streams ("1d" or single line streams); 2) Confluences of two dimensional streams ("2d" or double line streams represented as polygons); 3) Polygonal lake and pond features; and 4) Distinct island features. Personnel other than the originator conducted accuracy analysis. Data is believed to be of uniform positional accuracy. Potential errors were deemed to be random, thus check points were dispersed across the extent of the data. Additional enhancement to data accuracy involved the use of RF 40,000 scale 1992-93 NAPP color infrared aerial photos (Lamoille and White River Subbasins only). The RF 5,000 scale surface water data was plotted at RF 20,000 scale and overlaid onto enlargements (RF 20,000 scale) of the photos to determine errors of omission of water polygons. Errors noted on Mylar were digitized on-screen using digital orthophotos.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value:
FGDC - Geospatial Positioning Accuracy Standards, Part 3: National Standard for Spatial Data Accuracy
Horizontal_Positional_Accuracy_Explanation:
The National Standard for Spatial Data Accuracy (NSSDA) implements a well-defined statistic and testing methodology for positional accuracy of maps and geospatial data derived from sources such as aerial photographs, satellite imagery, or maps.
Assessment of horizontal accuracy was conducted by following guidelines outlined in "FGDC Geospatial Positioning Accuracy Standards Part 3: National Standards for Spatial Data Accuracy", section 3.2.2 Accuracy Test Guidelines (<http://www.fgdc.gov/standards/projects/FGDC-standards-projects/accuracy/part3/chapter3>). Accuracy checking is ideally conducted by a third party using an independent data source of higher accuracy than that used to create the data being tested. The accuracies reported were generated under the following conditions: 1) Personnel other than the original editor conducted accuracy analysis, 2) The best "independent source of higher accuracy" available is the RF 5000 scale Vermont Mapping Program digital orthophotos on which the original editing is based, and 3) Potential errors were deemed to be random, thus test points were dispersed across the entire extent of the data.
OVERVIEW - Twenty random "check" points were generated along the finalized surface water drainage network and compared against their actual "test" points on the ground that were visible using the RF 5,000 scale digital orthophotos.
Horizontal accuracy was assessed by conducting the following steps in ArcView® for each subbasin:
1) The finalized surface water data was assessed to ensure that a single route represented the entire 8 digit cataloging unit (subbasin). If one didn't exist then it was created.
2) Using the ArcView® extension "randpts.avx", a user extension created by Jeff Jenness, a Wildlife Biologist and GIS Analyst with the US Forest Service at the Rocky Mountain Research Station in Flagstaff, AZ, 20 random points were generated as "check" points. This extension is available from the ESRI ArcScripts website.
3) The "check" points and surface water data were overlaid upon the RF 5000 scale digital orthophotos to assess "check" points with their true locations, i.e., "test" points. Test point locations were stored in a separate point theme. A "key" field was maintained between these data sets. In some locations it was not possible to determine a "test" point with a high level of confidence so the "check" point was moved to the closest location along the same linear feature where a "test" location could be adequately determined on the orthophoto. Check points included any combination of the following features: A) Confluences of one dimensional streams ("1d" or single line streams); B) Confluences of two dimensional streams ("2d" or double line streams represented as polygons); C) Polygonal lake and pond features; and D) Distinct island features.
4) Using the ArcView® sample script "addxycoo.ave", X,Y coordinates were added to the features tables of both the "check" and "test" point attribute tables. These were then exported to comma delimited text files.
5) Using an Excel spreadsheet, created by the Minnesota Planning Land Management Information Center in a publication titled the "Positional Accuracy Handbook: Using the National Standard for Spatial Data Accuracy to measure and report geographic data quality" (<http://www.gda.state.mn.us/pdf/1999/lmic/nssda_o.pdf>), the delimited files were imported. This spreadsheet contains all formulas necessary to generate the NSSDA statistic representing average horizontal positional accuracy.
Source data for each subbasin is a composite of surface water data from different sources created using varying methodologies by numerous entities. Therefore, reported accuracy values are reported for this composite data. Features in this data are believed to be of uniform positional accuracy. Accuracy value does not take into account the horizontal positional accuracy of the source digital orthophotos, on which the data is based.
Vertical_Positional_Accuracy:
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Publication_Date: 1994-2000
Publication_Time: Unknown
Geospatial_Data_Presentation_Form: map
Publication_Information:
Source_Scale_Denominator: 5,000
Type_of_Source_Media: digital tape media
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20040927
Time_of_Day: unknown
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Vermont Mapping Program digital orthophotography
Source_Contribution:
VMP Orthos used in concert with the best available surface water data solicited from a variety of state, regional and local sources, i.e., layers: WaterHydro_SW, SW_nnnn, BCRC\BCSW, CVRPC\CVSW, NFLRI\SW, WaterHydro_DLGLAKE, DLGSWnn.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
U.S. Geological Survey in cooperation with U.S. Environmental Protection Agency
Publication_Date: 1999
Title: National Hydrography Dataset (NHD)
Source_Scale_Denominator: 100000
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: NHD
Source_Contribution: Reach codes and flow direction attributes
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: See dataset specific metadata
Title: Geographic Names Information System Oracle Database
Other_Citation_Details: unpublished materials
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Source_Currentness_Reference: Custom extract from the GNIS Databases
Source_Citation_Abbreviation: GNIS
Source_Contribution: Names for reaches and areal water
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: Unknown
Title: NHD basic features
Other_Citation_Details: unpublished materials
Source_Scale_Denominator: 24000
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: unknown
Source_Currentness_Reference: Date the revision process step was completed
Source_Citation_Abbreviation: NHD basic features
Source_Contribution: Spatial and attribute information
Source_Information:
Source_Citation:
Citation_Information:
Originator: (see dataset specific metadata)
Publication_Date: Unknown
Title:
Subbasin boundaries (formerly called Cataloging Unit Boundaries)
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: unknown
Source_Currentness_Reference: (see dataset specific metadata)
Source_Citation_Abbreviation: Subbasin boundaries
Source_Contribution: Updated Subbasin boundaries
Process_Step:
Process_Description:
Action; "Pre-release" version of the VHD White River subbasin complete. "Pre-conflation" spatial edits on surface water features completed for this subbasin. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20010511
Process_Time: Unknown
Process_Step:
Process_Description:
Action; "Pre-release" version of the VHD Missisquoi subbasin complete. "Pre-conflation" spatial edits on surface water features completed for this subbasin. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20010511
Process_Time: Unknown
Process_Step:
Process_Description:
Action; "Pre-release" version of the VHD Lamoille River subbasin complete. "Pre-conflation" spatial edits on surface water features completed for this subbasin. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20011030
Process_Time: Unknown
Process_Step:
Process_Description:
Action; "Pre-release" version of the VHD Upper CT River subbasin complete. "Pre-conflation" spatial edits on surface water features completed for this subbasin. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20020123
Process_Time: Unknown
Process_Step:
Process_Description:
Action; "Pre-release" version of the VHD Passumpsic River subbasin complete. "Pre-conflation" spatial edits on surface water features completed for this subbasin. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20020123
Process_Time: Unknown
Process_Step:
Process_Description:
Action; "Pre-release" version of the VHD St. Francois River subbasin complete. "Pre-conflation" spatial edits on surface water features completed for this subbasin. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20020123
Process_Time: Unknown
Process_Step:
Process_Description:
Action; "Pre-release" version of the VHD Winooski River subbasin complete. "Pre-conflation" spatial edits on surface water features completed for this subbasin. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20020426
Process_Time: Unknown
Process_Step:
Process_Description:
Action; "Pre-release" version of the VHD Deerfield River subbasin complete. "Pre-conflation" spatial edits on surface water features completed for this subbasin. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20020507
Process_Time: Unknown
Process_Step:
Process_Description:
Action; "Pre-release" version of the VHD Lake Champlain Direct subbasin complete. "Pre-conflation" spatial edits on surface water features completed for this subbasin. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20020708
Process_Time: Unknown
Process_Step:
Process_Description:
Action; "Pre-release" version of the VHD Otter Creek Direct subbasin complete. "Pre-conflation" spatial edits on surface water features completed for this subbasin. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20021009
Process_Time: Unknown
Process_Step:
Process_Description:
Action; "Pre-release" version of the VHD Connecticut River from Bellows Falls to Vernon Dam subbasin complete. "Pre-conflation" spatial edits on surface water features completed for this subbasin. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20021127
Process_Step:
Process_Description:
Action; "Pre-release" version of the VHD Lake George subbasin complete. "Pre-conflation" spatial edits on surface water features completed for this subbasin. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20030110
Process_Step:
Process_Description:
Action; "Pre-release" version of the VHD Hudson-Hoosic subbasin complete. "Pre-conflation" spatial edits on surface water features completed for this subbasin. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20030130
Process_Step:
Process_Description:
Action; "Pre-release" version of the VHD CT-Waits River to White River subbasin complete. "Pre-conflation" spatial edits on surface water features completed for this subbasin. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20030314
Process_Step:
Process_Description:
Action; "Certified" version of the VHD Lamoille, Passumpsic, White and Winooski River subbasins complete. Reprojected "certified" data acquired from USGS to the VT State Plane Coordinate System (VTSPCS). This data supercedes and replaces the "pre-release" version which will no longer be available for download on VGIS. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20030314
Process_Step:
Process_Description:
Action; "Pre-release" version of the VHD CT-Johns to Waits River subbasin complete. "Pre-conflation" spatial edits on surface water features completed for this subbasin. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20030320
Process_Step:
Process_Description:
Action; "Pre-release" version of the VHD Black-Ottaquechee Rivers subbasin complete. "Pre-conflation" spatial edits on surface water features completed for this subbasin. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20030603
Process_Step:
Process_Description:
Action; "Certified" version of the VHD Lake George and Otter Creek River subbasins complete. Reprojected "certified" data acquired from USGS to the VT State Plane Coordinate System (VTSPCS). This data supercedes and replaces the "pre-release" version which will no longer be available for download on VGIS. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20030620
Process_Step:
Process_Description:
Action; "Certified" version of the VHD Hudson-Hoosic and Deerfield River subbasins complete. Reprojected "certified" data acquired from USGS to the VT State Plane Coordinate System (VTSPCS). This data supercedes and replaces the "pre-release" version which will no longer be available for download on VGIS. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20030701
Process_Step:
Process_Description:
Action; "Pre-release" versions of the VHD Mississquoi and Middle CT River subbasins complete. "Pre-conflation" spatial edits on surface water features completed for these subbasins finalizes this phase for the entire state. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20030827
Process_Step:
Process_Description:
Action; "Pre-release" versions of the VHD Mississquoi and Middle CT River subbasins complete. "Pre-conflation" spatial edits on surface water features completed for these subbasins finalizes this phase for the entire state. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20030915
Process_Step:
Process_Description:
Action; "Certified" versions of the VHD CT-Johns to Waits River and Lake Champlain Direct subbasins complete. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20030930
Process_Step:
Process_Description:
Action; "Certified" versions of the VHD Mississquoi subbasin complete. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20031021
Process_Step:
Process_Description:
Action; "Certified" version of the VHD Upper Connecticut subbasin complete. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20031113
Process_Step:
Process_Description:
Action; Mitigated mis-posting of 1:24k NHD data received from USGS in 5k "wrapper" with 1:5k "Certified" version of the VHD Lake George subbasin. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20040129
Process_Step:
Process_Description:
Action; "Certified" version of the VHD CT-Bellows Falls to Vernon Dam complete. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20040628
Process_Step:
Process_Description:
Action; "Certified" version of the VHD Black-Ottaquechee complete. Data is tiled by SUBBASIN. Operator - Mike Brouillette, VCGI
Process_Date: 20040927
Process_Step:
Process_Description:
Action; Incorporated both "Hydrographic Category" (intermittent vs. perennial) and Value Added Attributes data attribute enrichments into VHD>. Data originally tiled by SUBBASIN has been appended statewide. Operator - Mike Brouillette, VCGI
Process_Date: 20080731
Process_Step:
Process_Description:
Action; Edited the Lake Champlain Lake feature to reflect the following islands: Button, Cave, Cedar, Dean, Garden, Gull, Juniper, Law, Marble, Mason, Picket, Rock, Ship Point, Sloop and Sunset. Operator - Mike Brouillette, VCGI
Process_Date: 20080806
Spatial_Data_Organization_Information:
Indirect_Spatial_Reference: <POINT | POLYGON | LINE | RASTER>
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: State Plane Coordinate System
State_Plane_Coordinate_System:
SPCS_Zone_Identifier: 4400
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999964
Longitude_of_Central_Meridian: -72.500000
Latitude_of_Projection_Origin: 42.500000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000000
Ordinate_Resolution: 0.000000
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Resolution: 0.000100
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: VHD
Attribute:
Attribute_Label: FTYPE
Attribute_Definition:
Three-digit integer value, unique identifier of a feature type. See NHDFcode.dbf table for descriptions.
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: COMID
Attribute_Definition: Unique identifier of the NHD feature or reach.
Attribute:
Attribute_Label: FDATE
Attribute_Definition: Date of last feature modification.
Attribute:
Attribute_Label: GNIS_NAME
Attribute_Definition:
Proper name, specific term, or expression by which a particular geographic entity is known
Attribute:
Attribute_Label: LENGTHKM
Attribute_Definition: Length of linear feature, Albers Equal Area.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: REACHCODE
Attribute_Definition:
Unique identifier composed of two parts, first eight digits are subbasin codes as defined by FIPS 103, next six digits are randomly assigned sequential number unique within a Cataloging Unit.
Attribute:
Attribute_Label: FLOWDIR
Attribute:
Attribute_Label: WBAREACOMI
Attribute_Definition:
COMid of waterbody through which the Flowline (Artificial Path) flows.
Attribute:
Attribute_Label: FCODE
Attribute_Definition:
Five-digit integer value comprised of the feature type and combinations of characteristics and values
Attribute:
Attribute_Label: SHAPE_LENG
Attribute:
Attribute_Label: RESOLUTION
Attribute_Definition:
Code for source resolution: 1 = Local resolution, 2 = high resolution, 3 = Medium resolution
Attribute:
Attribute_Label: GNIS_ID
Attribute_Definition: Unique Identifier assigned by GNIS
Attribute:
Attribute_Label: ENABLED
Attribute:
Attribute_Label: FROMMEAS
Attribute_Definition:
Measure along the reach where the start point of the event is located.
Attribute:
Attribute_Label: TOMEAS
Attribute_Definition:
Measure along the reach where the end point of the event is located.
Attribute:
Attribute_Label: AreaSqKm
Attribute_Definition:
Area of areal features (sq. km); based on Albers Equal Area projection
Attribute:
Attribute_Label: Elevation
Attribute_Definition:
Elevation, in meters, of water surfaces where water pools are encoded for a few features
Attribute:
Attribute_Label: EventDate
Attribute_Definition: Date Event was created.
Attribute:
Attribute_Label: ReachCode
Attribute_Definition:
Unique identifier composed of two parts, first eight digits are subbasin codes as defined by FIPS 103, next six digits are randomly assigned sequential number unique within a Cataloging Unit.
Attribute:
Attribute_Label: ReachSMDate
Attribute_Definition: Date of the reach used for the address.
Attribute:
Attribute_Label: REACHRESOLUTION
Attribute_Definition:
Identifies which database (local, high, medium) the reach came from.
Attribute:
Attribute_Label: FeatureComID
Attribute_Definition: Identifies the NHD key number for the feature.
Attribute:
Attribute_Label: FEATURECLASS
Attribute_Definition: Feature class event is based on.
Attribute:
Attribute_Label: Source_Originator
Attribute_Definition: Agency responsible for the event/feature.
Attribute:
Attribute_Label: Source_DataDesc
Attribute_Definition: Source of the event/feature such as NWIS.
Attribute:
Attribute_Label: Source_FeatureID
Attribute_Definition: Feature ID value that identifies the event/feature.
Attribute:
Attribute_Label: FeatureDetailURL
Attribute_Definition: Web link to detailed information.
Attribute:
Attribute_Label: EVENTTYPE
Attribute_Definition: NHD data element.
Attribute:
Attribute_Label: Offset
Attribute_Definition: NHD data element.
Overview_Description:
Entity_and_Attribute_Overview:
The VHD, as part of the NHD is a "core framework" dataset, is a comprehensive set of digital spatial data that encodes information about naturally occurring and constructed bodies of water, paths through which water flows, and related entities. The information encoded about features includes classification by type, other characteristics, a unique common identifier, the feature length or area, and (rarely) the elevation of the surface of water pools and a description of the stage of the elevation. For reaches, encoded information includes a reach code, the date the reach code was assigned, a unique common identifier, the reach length or area, and, for transport reaches, the stream level. Geographic names, and their identifiers in the Geographic Names Information System, are assigned to reaches or, if no reach is available, to features. The data also contain relations among reaches that encode the direction of water flow, metadata, and information that supports the exchange of future updates and improvements to the data. Entity_and_Attribute_Detail_Citation: "CERTIFIED" NHD DATA: Ultimately, the VHD will only contain NHD compliant attributes. For an overview on the VHD feature types, characteristics, and values, review the latest U.S. Geological Survey, "Standards for National Hydrography Dataset - local resolution": Reston, Virginia, U.S. Geological Survey. The document is available online through <http://mapping.usgs.gov/standards/>. Information about tables and fields in the data are available from the "Concepts and Contents" document at the NHD Technical Reference homepage (<http://NHD.usgs.gov/techref.html>).
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: VT Center for Geographic Information
Contact_Address:
Address_Type: Mailing and Physical Address
Address: 58 South Main Street, Suite 2
City: Waterbury
State_or_Province: VT
Postal_Code: 05676
Country: USA
Contact_Voice_Telephone: 802/882-3000
Contact_TDD/TTY_Telephone: None
Contact_Facsimile_Telephone: 802/882-3001
Contact_Electronic_Mail_Address: info@vcgi.org
Hours_of_Service: 9am - 5pm, M-F
Resource_Description: WaterHydro_VHD
Distribution_Liability:
VCGI and the State of Vermont make no representations of any kind, including but not limited to the warranties of merchantability or fitness for a particular use, nor are any such warranties to be implied with respect to the data.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: SHP
Format_Specification: ESRI Shapefile format (compressed into ZIP file format)
Format_Information_Content: geospatial data
File_Decompression_Technique: ZIP extraction tool
Transfer_Size: 17.694
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://www.vcgi.org/dataware/default.cfm?layer=>
Access_Instructions: Download from web site.
Offline_Option:
Offline_Media: CD-ROM
Offline_Option:
Offline_Media: DVD
Fees:
No charge when downloading from the Internet, and when no custom processing is required.
Ordering_Instructions:
Download from web site or mail-fax a copy of the VCGI 'Data Request Form' which is available from the VGIS web site <http://www.vcgi.org/dataware/order_forms>
Turnaround: About 5 days.
Custom_Order_Process:
Mail or Fax a copy of the VCGI 'Data Request Form' which is available from <http://www.vcgi.org/dataware/order_forms>
Technical_Prerequisites: ESRI Arc/Info, ArcView, or ArcExplorer software.
Available_Time_Period:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: <yyyymmdd>
Time_of_Day: unknown
Metadata_Reference_Information:
Metadata_Date: 20080725
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: VT Center for Geographic Information
Contact_Person: GIS Database Administrator
Contact_Address:
Address_Type: Mailing and Physical Address
Address: 58 South Main Street, Suite 2
City: Waterbury
State_or_Province: VT
Postal_Code: 05676
Country: USA
Contact_Voice_Telephone: 802/882-3000
Contact_TDD/TTY_Telephone: None
Contact_Facsimile_Telephone: 802/882-3001
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Access_Constraints: None
Metadata_Use_Constraints: None
Metadata_Security_Information:
Metadata_Security_Classification_System: N/A
Metadata_Security_Classification: Unclassified
Metadata_Security_Handling_Description: No security considerations
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.9.5 on Wed May 13 13:49:30 2009