Identification_Information: Citation: Citation_Information: Originator: Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office of Coast Survey (OCS) Publication_Date: 20070112 Title: Approved Maritime Limits for Johnston Atoll Edition: v. 1.0 Geospatial_Data_Presentation_Form: vector digital data Publication_Information: Publication_Place: Silver Spring, Maryland Publisher: NOAA's Ocean Service, Office of Coast Survey (OCS) Online_Linkage: Description: Abstract: NOAA's Office of Coast Survey (OCS) is responsible for generating the Three Nautical Mile Line, Territorial Sea, Contiguous Zone, and Exclusive Economic Zone (EEZ). Traditionally, these maritime limits have been generated by hand from the low water line depicted on paper, U.S. nautical charts. Upon final approval by the U.S. Baseline Committee, these official maritime limits are applied to the next edition of nautical charts produced by the Marine Chart Division of OCS. Due to new cartographic production processes and the availability of digital products such as Electronic Navigational Charts (ENCs), OCS has developed improved techniques for generating more accurate, digital maritime limits. Through the use of Geographic Information Systems (GIS) software such as CARIS' LOTS and ESRI's ArcGIS, the latest vector representations of these limits will be available to NOAA cartographers and the public. To create digital limits, the charted low water line is captured digitally and used as input to CARIS' LOTS: Limits and Boundaries software for the designation of a baseline. Once the limits are created, they are exported to a shapefile file using CARIS' Import SHP utility. These polyline shapefiles are contained within a zipped file. Purpose: This dataset is to be used as the source for the depiction of maritime limits on NOAA's paper nautical chart and electronic navigational chart. The maritime limits were constructed from baseline points that represent the most seaward, drying features at mean lower low water on NOAA's largest scale, latest edition, paper nautical charts of the area. These digital boundaries do NOT represent the official depiction of the maritime limits. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 2006 Ending_Date: 2007 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: Continually Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -169.98 East_Bounding_Coordinate: -169.03 North_Bounding_Coordinate: 17.19 South_Bounding_Coordinate: 16.30 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: GIS Theme_Keyword: Boundary Theme_Keyword: Baseline Theme_Keyword: Limits Theme_Keyword: Three Nautical Mile Line Theme_Keyword: Maritime Theme_Keyword: Law of the Sea Theme_Keyword: Territorial Sea Theme_Keyword: Contiguous Zone Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: Boundaries Theme_Keyword: Planning Cadastre Place: Place_Keyword_Thesaurus: None Place_Keyword: Johnston Atoll Place_Keyword: Johnston Island Place_Keyword: Sand Island Place_Keyword: Hikina Island Place_Keyword: Akau Island Place_Keyword: Johnston Island Harbor Place_Keyword: North Pacific Ocean Access_Constraints: NONE Use_Constraints: NOT FOR LEGAL USE Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office of Coast Survey (OCS) Contact_Position: Chief Geographer Contact_Address: Address_Type: mailing and physical address Address: 1315 East-West Highway N/CS City: Silver Spring State_or_Province: Maryland Postal_Code: 20910 Country: USA Contact_Voice_Telephone: (301) 713-2780 x127 Contact_Facsimile_Telephone: (301) 713-4019 Contact_Electronic_Mail_Address: Meredith.Westington@noaa.gov Hours_of_Service: Monday - Friday, 0900 EST - 1700 EST Native_Data_Set_Environment: CARIS' Law of the Sea: Limits and Boundaries v. 4.06 Hotfix 3, Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: In CARIS LOTS, one working mapping file was used for the project area of Johnston Atoll. The map projection was set to Mercator with a 0.001 meter X/Y resolution. The scaling latitude used for the CARIS map was determined by finding the midpoint between the northeast and southwest bounding coordinates of the project area. The baseline points were derived from the largest scale charts. As NOAA's raster nautical charts were brought into the CARIS environment, the CARIS map was reprojected on the fly to match the chart's projection, and heads-up digitizing in the CARIS environment was performed. The attributes established in LOTS were SourceDoc and Limit. The SourceDoc values reflect the nautical chart or hydrographic survey number upon which the baseline points were taken and are assumed to be accurate. No added tests were conducted. Logical_Consistency_Report: The data, which reflects the largest scale nautical charts or hydrographic surveys of the area, are believed to be logically consistent. Completeness_Report: The maritime limits are complete for Johnston Atoll. The limits may be updated at a later date if the charted depiction of the farthest seaward low-water mark changes. These limits were created for internal purposes only to improve the accuracy of the charted maritime limits. These limits do not represent the official depiction of these maritime limits. For the official depiction of the limits, please see NOAA's paper or raster nautical charts. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: No specific test was performed on the dataset. The data is a reflection of the largest scale raster nautical charts of the area. In some cases, hydrographic surveys were referenced to determine if charted features such as rocks awash were drying at mean lower low water. The number of decimal places used in the output format does not imply an accuracy level higher than the source chart documents. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The maritime limits are projected from a designated baseline. Points representing the baseline are referenced from the farthest seaward low-water mark as depicted on the largest scale, raster nautical charts. No specific test was used to determine the vertical accuracy of the points. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office of Coast Survey (OCS) Publication_Date: 1998 Title: Maptech's BSB-format raster nautical charts for Johnston Atoll: 83637_1, 83637_2 Edition: latest edition Geospatial_Data_Presentation_Form: raster digital data Publication_Information: Publication_Place: Silver Spring, Maryland Publisher: NOAA's Ocean Service, Office of Coast Survey (OCS) Online_Linkage: Source_Scale_Denominator: 12,500 Type_of_Source_Media: raster nautical chart Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1998 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: BSB Source_Contribution: The maritime limits are created from normal baseline points. Points representing the baseline are referenced from the farthest seaward low-water mark as depicted on the largest scale, paper nautical charts. NOAA's raster nautical charts were used as backdrops in the CARIS map. As these charts were brought into the CARIS environment, the CARIS map was reprojected on the fly to match the chart's projection. The latest edition charts were used as referenced in the citation information section above. The dates of these latest editions were current as of 2007. Process_Step: Process_Description: The latest edition, largest scale charts were used to create a continuous vector low water line from which baseline points would be chosen from. The hydrographic surveys and descriptive reports were used as secondary source materials from which charted asterisk rock symbols (rocks awash) were verified to dry at mean lower low water. In the LOTS environment, the "Envelope of Arcs from Normal Points" tool was applied to the cleaned low water line and any additional rock features. As input to the "Envelope of Arcs" tool, OCS selected the limit distance in nautical miles and designated the attributes for the baseline points. This tool generated the contributing baseline points and the boundary limit using a wagon-wheel filtering process of rolling a circle with a diameter specified by the limit distance and choosing the seaward-most points along the low water line. Source_Used_Citation_Abbreviation: BSB Process_Date: 200610 through 200701 Source_Produced_Citation_Abbreviation: BASEBOUNDS Process_Step: Process_Description: The resulting limits were attributed in CARIS and exported using the "Import SHP" utility in CARIS. The polyline was exported from CARIS LOTS as WGS84. The limits were further attributed in ArcView 3.2a. Source_Used_Citation_Abbreviation: BASEBOUNDS Process_Date: 200612 through 200803 Source_Produced_Citation_Abbreviation: SUBJECTDATASET Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Link Point_and_Vector_Object_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: .001 Longitude_Resolution: .001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: World Geodetic System 1984 Ellipsoid_Name: World Geodetic System 1984 Semi-major_Axis: 6,378,137.0 Denominator_of_Flattening_Ratio: 298.26 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Maritime Limits Entity_Type_Definition: Shapefile Attribute Table Entity_Type_Definition_Source: None 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: LIMIT Attribute_Definition: Limit identifier Attribute_Definition_Source: Office of Coast Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Three Nautical Mile Line Enumerated_Domain_Value_Definition: Three Nautical Mile Line (old Territorial Sea) Enumerated_Domain_Value_Definition_Source: Office of Coast Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Territorial Sea Enumerated_Domain_Value_Definition: Territorial Sea Enumerated_Domain_Value_Definition_Source: Office of Coast Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Contiguous Zone Enumerated_Domain_Value_Definition: Contiguous Zone Enumerated_Domain_Value_Definition_Source: Office of Coast Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Exclusive Economic Zone Enumerated_Domain_Value_Definition: Exclusive Economic Zone Enumerated_Domain_Value_Definition_Source: Office of Coast Survey Attribute: Attribute_Label: LOCATION Attribute_Definition: Identifier of feature within a state or territory Attribute_Definition_Source: Office of Coast Survey Attribute_Domain_Values: Unrepresentable_Domain: Contains free text for location descriptions as a subset of the state or territory, for example "St. Croix" of the U.S. Virgin Islands. Attribute: Attribute_Label: APPRVDATE Attribute_Definition: Approval date of baseline points by the ad hoc Committee on the U.S. Baseline Attribute_Definition_Source: Office of Coast Survey Attribute_Domain_Values: Unrepresentable_Domain: Date Field formatted as YYYYMMDD for the date on which the limits were approved by the U.S. Baseline Committee, chaired by the Department of State. Attribute: Attribute_Label: SRCSCALE Attribute_Definition: The range of scales of source documents from which the limits are projected. Attribute_Definition_Source: Office of Coast Survey Attribute_Domain_Values: Unrepresentable_Domain: Text Field showing the scale range for the source documents. For example 1: "10,000-80,000". Attribute: Attribute_Label: SrcDoc Attribute_Definition: Source chart from which baseline points were derived in order to project the maritime limits. Attribute_Definition_Source: Office of Coast Survey Attribute_Domain_Values: Unrepresentable_Domain: Date Field formatted as YYYY for the beginning publication date of the source documents. Attribute: Attribute_Label: SrcDate Attribute_Definition: Publication date of source documents formatted in YYYY. Attribute_Definition_Source: Office of Coast Survey Attribute_Domain_Values: Unrepresentable_Domain: Date Field formatted as YYYY for the beginning publication date of the source documents. Attribute: Attribute_Label: SRCDATUM Attribute_Definition: Datum of the source documents from which the limits are projected. Attribute_Definition_Source: Office of Coast Survey Attribute_Domain_Values: Unrepresentable_Domain: Text description of the datum for determining the limits. For example "NAD83/WGS84". Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office of Coast Survey (OCS) Contact_Position: Chief Geographer Contact_Address: Address_Type: mailing and physical address Address: 1315 East-West Highway N/CS City: Silver Spring State_or_Province: Maryland Postal_Code: 20910 Country: USA Contact_Voice_Telephone: (301) 713-2780 x127 Contact_Facsimile_Telephone: (301) 713-4019 Contact_Electronic_Mail_Address: Meredith.Westington@noaa.gov Hours_of_Service: Monday - Friday, 0900 EST - 1700 EST Resource_Description: Downloadable Data Distribution_Liability: Users must assume responsibility to determine the appropriate use of this data set. These digital maritime limits do not represent the official depiction of the maritime limits. The official depiction still remains the depiction on NOAA's nautical charts. Please contact the Chief Geographer for more detailed information, if required. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: SHP (ESRI polyline shapefile) Format_Version_Date: 20070601 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: Fees: None Metadata_Reference_Information: Metadata_Date: 20080312 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office of Coast Survey (OCS) Contact_Position: Chief Geographer Contact_Address: Address_Type: mailing and physical address Address: 1315 East-West Highway N/CS City: Silver Spring State_or_Province: Maryland Postal_Code: 20910 Country: USA Contact_Voice_Telephone: (301) 713-2780 x127 Contact_Facsimile_Telephone: (301) 713-4019 Contact_Electronic_Mail_Address: Meredith.Westington@noaa.gov Hours_of_Service: Monday - Friday, 0900 EST - 1700 EST Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time