Identification_Information: Citation: Citation_Information: Originator: State of Alaska - Department of Transportation and Public Facilities Publication_Date: 19991117 Title: Alaska Highway GPS Centerline Data Edition: N/A Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Juneau, Alaska Publisher: Department of Transportation and Public Facilities / Statewide GIS Mapping Section Online_Linkage: http://www.dot.state.ak.us/mapping/dgps_centerline.html Description: Abstract: This coverage, created by the Alaska Department of Transportation and Public Facilities Statewide GIS Mapping Section, depicts the roadway centerlines for the major highways in Alaska . The centerline data was collected using a Trimble Pro XR DGPS receiver during the summer of 1997 to the fall of 1999. The raw centerline data was exported from Trimble's Pathfinder Office software into ARC/INFO where it was converted into an arc coverage, edited, attributed, and projected. Purpose: The Alaska Department of Transportation and Public Facilities Statewide GIS Mapping Section collected the DGPS centerline data and created this centerline coverage in an effort to establish a current, accurate digitial transportation data set for the state. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 19970501 Ending_Date: 19990901 Currentness_Reference: ground condition Status: Progress: In work Maintenance_and_Update_Frequency: Unknown Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -152.413411 East_Bounding_Coordinate: -126.320875 North_Bounding_Coordinate: 68.453186 South_Bounding_Coordinate: 59.052109 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: GPS Centerline Data Theme_Keyword: DGPS Theme_Keyword: Highways Theme_Keyword: Streets Theme_Keyword: Roads Theme_Keyword: Major Highway Systems Theme_Keyword: Alaska Highway Theme_Keyword: Chena Hot Springs Road Theme_Keyword: Circle Hot Springs Road Theme_Keyword: Denali Highway Theme_Keyword: Elliott Highway Theme_Keyword: George Parks Highway Theme_Keyword: Glenn Highway Theme_Keyword: Haines Highway Theme_Keyword: James Dalton Highway Theme_Keyword: Klondike Highway Theme_Keyword: Petersville Road Theme_Keyword: Richardson Highway Theme_Keyword: Seward Highway Theme_Keyword: Steese Highway Theme_Keyword: Sterling Highway Theme_Keyword: Taylor Highway Theme_Keyword: Tok Cut-Off Highway Theme_Keyword: Top of the World Highway Place: Place_Keyword_Thesaurus: None Place_Keyword: Alaska Temporal: Temporal_Keyword_Thesaurus: None Temporal_Keyword: 1997 Temporal_Keyword: 1998 Temporal_Keyword: 1999 Access_Constraints: None Use_Constraints: Limitations of Data. Acknowledgment of the Alaska Department of Transportation and Public Facilities, Statewide GIS Mapping Section would be appreciated in products derived from these data sets. Any hardcopies or published datasets utilizing these data sets shall clearly indicate their source. If the user has modified the data in any way they are obligated to describe the types of modifications they have performed. User specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the Alaska Department of Transportation and Public Facilities. Any hardcopies or published datasets utilizing these data sets shall clearly indicate their source. If the user has modified the data in any way they are obligated to describe the types of modifications they have performed. User specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the Alaska Department of transportation and Public Facilities. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Garry Remsberg, Jr. Contact_Organization: State of Alaska - Department of Transportation and Public Facilities Contact_Position: Cartographer II Contact_Address: Address_Type: mailing and physical address Address: Planning Division - Statewide GIS Mapping Section 3132 Channel Drive, MS/2500 City: Juneau State_or_Province: Alaska Postal_Code: 99801-7898 Country: USA Contact_Voice_Telephone: 907-465-8956 Contact_Facsimile_Telephone: 907-465-6984 Contact_Electronic_Mail_Address: gis@dot.state.ak.us Data_Set_Credit: State of Alaska - Department of Transportation and Public Facilities - Statewide GIS Mapping Section Native_Data_Set_Environment: Windows NT Version 4.0 (Build 1381) Service Pack 5; ESRI ArcInfo 8.1.0.415 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The road centerline data was collected using a twelve channel Trimble Pro XR receiver with a Trimble TSC1 data logger running Trimble's Asset Surveyor software. Centerlines were captured as line features with a collection interval of one position per second. All rover files were differentially corrected with the best available base station data. Trimble specifies the Pro XR receiver as capable of delivering differentially corrected C/A code position accuracy to better than 50 centimeters (RMS) horizontal. The 50 centimeter level of horizontal accuracy is obtained only under optimal operating circumstances. The accuracy of each determined position may be greatly degraded by many factors. Factors that degrade accuracy may include but are not limited to atmospheric interference, satellite geometry, satellite clock errors, satellite orbit errors, topography, receiver noise, and multipathing errors. Since our road centerline data was collected in very dynamic driving conditions it is not possible to make a blanket statement of accuracy. However, Trimble's Pathfinder Office software does provide tools to predict the precision of both individual observations and entire features. Trimble's precision estimates are RMS based. Average horizontal 2dRMS values for our road centerline data range from four to eight feet. Precision estimates should be used as a gauge of quality and repeatability and not be misconstrued as a measurement to or from true feature location. Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Complete chain Point_and_Vector_Object_Count: 1012 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 4 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Albers Conical Equal Area Albers_Conical_Equal_Area: Standard_Parallel: 55.000000 Standard_Parallel: 65.000000 Longitude_of_Central_Meridian: -154.000000 Latitude_of_Projection_Origin: 50.000000 False_Easting: 0.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.002048 Ordinate_Resolution: 0.002048 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: gps_akhwysy.aat Attribute: Attribute_Label: LAYER Attribute_Definition: Characterizes the quality of the GPS centerline data. Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: ROADCENTERLINE Enumerated_Domain_Value_Definition: GPS Centerline data (final product) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: ROADCENTERLINE_BAD Enumerated_Domain_Value_Definition: Corrupt GPS centerline data (will need to re-collect road segment) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: ROADCENTERLINE_UNCOR Enumerated_Domain_Value_Definition: Uncorrected GPS centerline data (no correction data available, will need to re-collect road segment) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: USGS 1:25,000 Enumerated_Domain_Value_Definition: United States Geological Survey Digital Line Graph roadway data 1:25,000 scale. Attribute: Attribute_Label: NAME Attribute_Definition: Signed name that appeared on the road during GPS collection or name assigned to the road by the Alaska Department of Transportation and Public Facilities Statewide Traffic Data Section. Attribute: Attribute_Label: CDSNUM Attribute_Definition: Unique route identification number assigned by the Alaska Department of Transportation and Public Facilities Statewide Traffic Data Section Attribute: Attribute_Label: LNGTHML Attribute_Definition: Length of arc segment in miles. Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Garry Remsberg, Jr. Contact_Organization: Alaska Department of Transportation and Public Facilities Contact_Position: Cartographer II Contact_Address: Address_Type: mailing and physical address Address: Planning Division - Statewide GIS Mapping Section 3132 Channel Drive, MS/2500 City: Juneau State_or_Province: Alaska Postal_Code: 99801-7898 Country: USA Contact_Voice_Telephone: 907-465-8956 Contact_Facsimile_Telephone: 907-465-6984 Contact_Electronic_Mail_Address: gis@dot.state.ak.us Distribution_Liability: Although this data set has been processed successfully on a computer system at the State of Alaska, Department of Transportation and Public Facilities, Statewide GIS Mapping, no warranty expressed or implied is made by the State of Alaska regarding the utility of the data on any system, nor shall the act of distribution constitute such a warranty. The State of Alaska and Department of Transportation and Public Facilities makes no expressed or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user purposes. In no event will the State of Alaska and/or The Department of Transportation and Public Facilities be liable for any incidental, indirect, special, consequential or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products, any failure thereof or otherwise, and in no event will the State of Alaska and/or The Department of Transportation and Public Facilities liability to the requestor or anyone else exceed the fee paid for the electronic service or product. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ARCE Format_Version_Number: 8.0.2 Format_Specification: ArcView 3.2 Shapefile Format_Information_Content: Alaska Highway GPS Centerline Data File_Decompression_Technique: Self-Extracting Zip File (WinZip 7.0) Transfer_Size: 3.672 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://www.dot.state.ak.us/mapping/GPS_Shapefiles/akhwysy.exe Access_Instructions: Internet Connection Fees: None Ordering_Instructions: Contact State of Alaska, Department of Transportation and Public Facilities, Statewide GIS Mapping Section either in writing, via phone, or e-mail. Data is downloadable as an ArcView 3.2 Shapefile in a Self-Extracting Zip File (WinZip 7.0). DGPS Centerline Data HomePage is located at : http://www.dot.state.ak.us/mapping/dgps_centerline.html Turnaround: Variable Metadata_Reference_Information: Metadata_Date: 20000811 Metadata_Future_Review_Date: 20001117 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Garry Remsberg, Jr. Contact_Organization: State of Alaska - Department of Transportation and Public Facilities Contact_Position: Cartographer II Contact_Address: Address_Type: mailing and physical address Address: Planning Division - Statewide GIS Mapping Section 3132 Channel Drive, MS/2500 City: Juneau State_or_Province: Alaska Postal_Code: 99801-7898 Country: USA Contact_Voice_Telephone: 907-465-8956 Contact_Facsimile_Telephone: 907-465-6984 Contact_Electronic_Mail_Address: gis@dot.state.ak.us 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: Limitations of Data. Acknowledgment of the Alaska Department of Transportation and Public Facilities, Statewide GIS Mapping Section would be appreciated in products derived from these data sets. Any hardcopies or published datasets utilizing these data sets shall clearly indicate their source. If the user has modified the data in any way they are obligated to describe the types of modifications they have performed. User specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the Alaska Department of Transportation and Public Facilities. Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile