Molokai Hydrography

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: U.S. Geological Survey, Western Geographic Science Center

Publication_Date: May 2004

Title: Molokai Hydrography

Geospatial_Data_Presentation_Form: vector digital data

Online_Linkage: <http://hawaii.wr.usgs.gov/molokai/data.html>

Description:

Abstract:

This data set includes the traditional set of hydrography information shown on USGS 1:24,000-scale topographic maps.

Purpose:

These data are intended for geographic display and analysis at a regional level. The data should be displayed and analyzed at scales appropriate for 1:24,000-scale data.

Time_Period_of_Content:

Time_Period_Information:

Multiple_Dates/Times:

Single_Date/Time:

Calendar_Date: 1983

Single_Date/Time:

Calendar_Date: 1993

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: Irregular

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -157.308724

East_Bounding_Coordinate: -156.710941

North_Bounding_Coordinate: 21.219842

South_Bounding_Coordinate: 21.045350

Keywords:

Theme:

Theme_Keyword_Thesaurus: none

Theme_Keyword: Digital Line Graph

Theme_Keyword: DLG

Theme_Keyword: hydrography

Theme_Keyword: hydrology

Theme_Keyword: drainage

Theme_Keyword: streams

Theme_Keyword: rivers

Place:

Place_Keyword_Thesaurus:

U.S. Department of Commerce, 1983, Codes for Identification of Hydrologic Units in the United States and the Caribbean Outlying Areas (Federal Information Processing Standard 103): Washington, D.C., National Institute of Standards and Technology.

Place_Keyword: Hawaiian Islands

Place_Keyword: Hawaii

Place_Keyword: Hawai'i

Place_Keyword: Molokai

Place_Keyword: Maui

Access_Constraints: None.

Use_Constraints:

None. Acknowledgment to the U.S. Geological Survey would be appreciated.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Henry Wolter

Contact_Organization: U.S. Geological Survey

Contact_Position: Liaison, Hawaii and Pacific Basin Islands

Contact_Address:

Address_Type: mailing and physical address

Address: 677 Ala Moana Blvd., Suite 415

City: Honolulu

State_or_Province: HI

Postal_Code: 96813

Country: USA

Contact_Voice_Telephone: 808-587-2409

Contact_Facsimile_Telephone: 808-587-2401

Contact_Electronic_Mail_Address: hwolter@usgs.gov

Data_Set_Credit:

U.S. Geological Survey in cooperation with U. S. Environmental Protection Agency and State Cooperators

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The accuracy of the attributes of the Digital Line Graph data is estimated to be 98.5 percent. One or more of the following methods were used to test attribute accuracy: manual comparison of the source with hardcopy plots; symbolized display of the digital line graph on an interactive computer graphic system; selected attributes that could not be visually verified on plots or on screen were interactively queried and verified on screen. In addition, software validated feature types and characteristics against a master set of types and characteristics,checked that combinations of types and characteristics were valid, and that types and characteristics were valid for the delineation of the feature. Feature types, characteristics, and other attributes conform to the Standards for National Hydrography Dataset - High Resolution (USGS, 1999) as of the date they were loaded into the database. All names on the 1:24,000-scale reaches were validated against a April 1999 extract 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 been interactively checked against the April 1999 Geographic Names Information System names extract, however, operator error could in some cases apply a name to a wrong reach.

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.

Completeness_Report:

The completeness of the data reflects the published map. Features found on the ground may have been eliminated or generalized on the source graphic because of scale and legibility constraints. In general, streams longer than one mile (approximately 1.6 kilometers) were collected. Most streams that flow from a lake were collected regardless of their length. Only definite channels were collected so not all swamp/marsh features have stream/rivers delineated through them. Lake/ponds 100 feet or greater in the shortest axis were collected. Note, however, that these general rules were applied unevenly among maps during compilation. Transport reaches are defined on nearly all features of type stream/river, canal/ditch, artificial path, and connector. Detailed capture conditions are provided for every feature type in the Standards for National Hydrography Dataset - High Resolution (USGS, 1999), available online through <http://mapping.usgs.gov/standards/>.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Statements of horizontal positional accuracy are based on accuracy statements made for U.S. Geological Survey topographic quadrangle maps. These maps were compiled to meet National Map Accuracy Standards. For horizontal accuracy, this standard is met if at least 90 percent of points tested are within 0.02 inch (at map scale) of the true position. Additional offsets to positions may have been introduced where feature density is high to improve the legibility of map symbols.In addition, the digitizing of maps is estimated to contain a horizontal positional error of less than or equal to 0.003 inch standard error(at map scale) in the two component directions relative to the source maps. Visual comparison between the map graphic (including digital scans of the graphic) and plots or digital displays of points, lines, and areas, is used as control to assess the positional accuracy of digital data. Digital map elements along the adjoining edges of data sets are aligned if they are within a 0.02 inch tolerance (at map scale). Features with like dimensionality (for example, features that all are delineated with lines), with or without like characteristics, that are within the tolerance are aligned by moving the features equally to a common point. Features outside the tolerance are not moved; instead, a feature of type connector is added to join the features.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Statements of vertical positional accuracy for elevation of water surfaces are based on accuracy statements made for U.S. Geological Survey topographicquadrangle maps. These maps were compiled to meet National Map Accuracy Standards. For vertical accuracy, this standard is met if at least 90 percent of well-defined points tested are within one-half contour interval of the correct value. Elevations of water surface printed on the published map meet this standard; the contour intervals of the maps vary. These elevations were transcribed into the digital data; the accuracy of this transcription was checked by visual comparison between the data and the map.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Geological Survey

Publication_Date: Unpublished Material

Title: NHD basic features

Source_Scale_Denominator: 24000

Type_of_Source_Media: online

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20000101

Source_Currentness_Reference: Date the revision process step was completed

Source_Citation_Abbreviation: NHD

Source_Contribution: spatial and attribute information

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Geological Survey

Publication_Date: 19990101

Title: CU boundaries

Source_Scale_Denominator: 24000

Type_of_Source_Media: online

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 19970901

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: CU

Source_Contribution: updated CU boundaries

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Geological Survey

Publication_Date: Unpublished Material

Title: Geographic Names Information System Oracle Database

Source_Scale_Denominator: 0

Type_of_Source_Media: online

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 19990401

Source_Currentness_Reference: custom extract from the GNIS databases

Source_Citation_Abbreviation: GNIS

Source_Contribution: Names for reaches and areal water bodies.

Source_Information:

Source_Citation:

Citation_Information:

Originator:

U.S. Geological Survey in cooperation with the U.S. Environmental Protection Agency

Publication_Date: 1999

Title: National Hydrography Dataset

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.

Process_Step:

Process_Description:

Create high-resolution NHD from revised DLG data. This process started with published 1:24,000-scale USGS DLG hydrography files and used DOQs to revise the data. Features were modified to the DOQ only where compelling evidence of change existed. DLG files were converted to NHD datasets using the 3-to-F process. These files were then edited to remove any conversion errors and to add any required centerlines. Once all of the Hi-resolution datasets were generated then a Hi-resolution CU was created using one of two paths. The first path loaded all of the quad NHD datasets into the FOD and then unloaded a Hi-resolution CU dataset. The second path used FTI to generate the Hi-resolution CU by combining the quad based datasets into a single CU dataset. During this combination any of the 1-D features with the same feature type were snapped together using a user specified tolerance. After combining the datasets, all of the features that fall outside the 100K HUC boundary were removed. At this point any additional connectors were added to the data. After the Hi-resolution CU was generated, if was conflated to the appropriate 100K CU. Prior to the actual conflation all of the Hi-resolution are directions where modified to be directed downstream. Next conflation was performed to conflate reach codes and associated flow relationships from the 100K NHD data to the Hi-Resoultion dataset. After the conflation process, editing was performed to correct any conflation errors. At this point new network and 2-D waterbody reaches and associated flow were added to the dataset. Appropriate stream levels and flow sequences were then applied. Additional Geographic Names were applied using the appropriate Geographic Names Information System (GNIS) source coverages. Data processed by Toby Vana USGS-WRD ttvana@usgs.gov, 808-587-2445 USGS, 677 Ala Moana Blvd., Suite 415, Honolulu, HI, 96816

Process_Date: 20010912

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: String

Point_and_Vector_Object_Count: 1066

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 4

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.999600

Longitude_of_Central_Meridian: -159.000000

Latitude_of_Projection_Origin: 0.000000

False_Easting: 500000.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000128

Ordinate_Resolution: 0.000128

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

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: hyd

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: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: FTYPE

Attribute:

Attribute_Label: METERS

Attribute:

Attribute_Label: MAJOR

Attribute:

Attribute_Label: MINOR

Overview_Description:

Entity_and_Attribute_Overview:

The National Hydrography 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) 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. 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:

The names and definitions of all feature types, characteristics, and values are in U.S. Geological Survey, 1999, Standards for National Hydrography Dataset High-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 user documentation for the National Hydrography Dataset-High Resolution.

Distribution_Information:

Resource_Description: Downloadable Data

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size: 0.630

Metadata_Reference_Information:

Metadata_Date: 20060208

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Address:

Address_Type: mailing and physical address

Address:

U.S. Geological Survey Rocky Mountain Mapping Center P.O. Box 25046

City: Denver

State_or_Province: Colorado

Postal_Code: 80225-0046

Country: USA

Contact_Voice_Telephone: 303-202-4557

Hours_of_Service: Monday-Friday,7AM-3PM CST

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile