Identification_Information: Citation: Citation_Information: Originator: Georgia Department of Transportation, Office of Transportation Data Publication_Date: Unpublished Material Publication_Time: Unknown Title: Georgia Department of Transportation, Office of Transportation Data Edition: 2006-2007 Geospatial_Data_Presentation_Form: Bridge vector digital data Publication_Information: Publication_Place: State of Georgia Publisher: Georgia GIS Data Clearinghouse Other_Citation_Details: To be published online within the National Spatial Data/Georgia Spatial Data Infrastructure nodes at Georgia Tech and the University of Georgia. Online_Linkage: http://www.gis.state.ga.us Larger_Work_Citation: Citation_Information: Originator: Georgia Department of Transportation, Office of Transportation Data Publication_Date: Unpublished Material Publication_Time: Unknown Title: Georgia Bridge Centerlines Geospatial_Data_Presentation_Form: Bridge vector digital data Series_Information: Series_Name: Georgia Department of Transportation Bridge Centerline Project Description: Abstract: This dataset contains a GPS measurement of the center of a bridge for all bridges open and intended for public use. This includes U.S. and State bridges, county bridges and city bridges. Each side of a divided bridge was collected as a separate bridge centerline. Linear features were obtained on-site with a vehicle mounted Trimble ProXRS/GeoExplorer Series GPS receiver using real-time Omnistar or SBAS (WAAS) Satellite Base Augmentation System satellite differential (C/A signal) GPS corrections on civilian frequencies. Differential post processing correction was applied to enhance data accuracy when real-time Omnistar or SBAS (WAAS) was unavailable. Spatial data was checked for quality using georeferenced SDE Atlanta 2004 aerial photo and Mr. SID raster layers in ArcMap-ARCINFO v. 9.x. Multi-pathing errors were removed by deleting vertices. No vertices were added in the editing process. Attribute accuracy was cross checked with BIMS-Bridge Information Management System GIS data layer. All Data were exported out of Pathfinder Office v. 3.0 in geographic coordinates into ArcMap-ArcInfo 9.x shapefiles. All reprojections were conducted using ArcMap-ArcInfo v. 9.x using projection and transformation toolset under Data Management Tools in Arc Toolbox or ArcView v. 3.x Projection Utility Wizard. Purpose: This data was developed for the Georgia Department of Transportation to update and maintain Georgia BIMS Bridge Information Management System GIS data layer. BIMS data sources were used to identify bridges for GPS collection. When complete, the Georgia bridge layer shall serve as a part of the statewide basemap BIMS GIS data layer. Supplemental_Information: The opinions, findings, and conclusions in this publication are those of the author(s) and not necessarily those of the Georgia Department of Transportation, State of Georgia, or the Federal Highway Administration. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20060701 Beginning_Time: Unknown Ending_Date: 20070630 Ending_Time: Unknown Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: Annually Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -84.03586 East_Bounding_Coordinate: -83.033166 North_Bounding_Coordinate: 34.75684 South_Bounding_Coordinate: 34.334034 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: bridge centerline Theme_Keyword: highway Theme_Keyword: interstate Theme_Keyword: road Theme_Keyword: bridge Theme_Keyword: street Theme_Keyword: transportation Theme_Keyword: DLG-F Theme_Keyword: GPS Theme_Keyword: Global Positioning System Place: Place_Keyword_Thesaurus: None Place_Keyword: Georgia Place_Keyword: GA Place_Keyword: State of Georgia Place_Keyword: County Place_Keyword: Counties Access_Constraints: Accessibility to the data shall comply with all relevant Federal, State, and Local laws. All data is considered a public record and subject to the provisions of the federal Open Records Act and the Official Code of Georgia (Chapter 50-18, Article 4 Inspection of Public Records). Use_Constraints: This data may not be copyrighted by the Regional Development Center with the provision that the Georgia Department of Transportation and the Federal Highway Administration reserve a royalty-free, non-exclusive, and irrevocable license to reproduce, publish, or otherwise use, and authorize others to use, the work for government purposes Not for use at scales larger than 1:24,000. Users should exercise their own judgment on the scope of work for which this data set is being used. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Georgia Department of Transportation, Office of Transportation Data Contact_Address: Address_Type: mailing and physical address Address: Office of Transportation Data North Annex 5025 New Peachtree Road City: Chamblee State_or_Province: Georgia Postal_Code: 30341 Country: USA Contact_Voice_Telephone: 770-986-1360 Contact_Facsimile_Telephone: 770-986-1056 Contact_Electronic_Mail_Address: http://gis.dot.state.ga.us Hours_of_Service: 8:00 AM – 4:45 PM, M-F, Subject to all Official State Holidays Contact_Instructions: Please call or send written request for information or data. Browse_Graphic: Browse_Graphic_File_Name: JPEG Browse_Graphic_File_Description: Picture of the view map extent of the data. Browse_Graphic_File_Type: JPEG Data_Set_Credit: Collected and developed by the Georgia Department of Transportation, Office of Transportation Data. Prepared in cooperation with the Department of Transportation, Federal Highway Administration. Security_Information: Security_Classification_System: None Security_Classification: Unclassified Security_Handling_Description: None Native_Data_Set_Environment: Windows XP Pro; ESRI ArcMap-ArcInfo v 9.0, Arc View 3.x Cross_Reference: Citation_Information: Originator: Georgia Department of Transportation, Office of Transportation Data Publication_Date: 20060701 Publication_Time: Unknown Title: Georgia Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: State of Georgia Publisher: Georgia GIS Data Clearinghouse Other_Citation_Details: This dataset contains public bridge centerlines including interstates, state bridges, county bridges, and city bridges. Online_Linkage: http://www.gis.state.ga.us/ Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Dependant on the skill level of the individual data collector to correctly identify features solely based on field observations. Also dependant on the skill level of the individual collector to correctly use the GPS receiver. Length is contained within three fields. The LENGTH was calculated by ArcMap-ArcInfo v. 9.x. The GPS_LENGTH is the 2D horizontal length calculated by Trimble Pathfinder Office v. 3.0. The GPS_#DLENG is the 3D horizontal length calculated by Trimble Pathfinder Office v. 3.0. Quantitative_Attribute_Accuracy_Assessment: Attribute_Accuracy_Explanation: All attributes and methods of collection are described in documented Georgia Department of Transportation Global Positioning System Data Collection Standards as well as the Trimble Pathfinder Office v. 3.0 Data dictionary file named BridgeCenterline.ddf last modified on 20060701. Logical_Consistency_Report: Shapefile format exists for GIS analysis Completeness_Report: The data set is complete for all identified updates to this county's bridge layer. Bridges for collection were identified using Georgia Department of Transportation’s BIMS-Bridge Information Management System data source. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Meets or exceeds National Map Accuracy Standards for 1:12,000 scale data. Dependant on the skill level of the individual collector to correctly use the segmenting, pausing, and offset functions of the GPS receiver. Quantitative_Horizontal_Positional_Accuracy_Assessment: Horizontal_Positional_Accuracy_Explanation: Differential GPS signal accuracy from Omnistar/SBAS/Post Processing satellite correction is dependant on the GPS receiver used. The Trimble ProXRS/GeoExplorer Series receiver with differential correction has a horizontal accuracy of each position being better than 50 cm (RMS), but is subject to operational conditions. The Signal to Noise Ratio mask was set at 6. The Position Dilution of Precision mask was set at 6. The Elevation mask was set at 15 degrees. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Vertical accuracy lies within 2 - 3 times the horizontal accuracy of the GPS receiver. Lineage: Process_Step: Process_Description: Bridge linear features were obtained on-site with the antenna mounted in the center of the vehicle. A Trimble ProXRS/GeoExplorer series GPS receiver was used either in real-time Omnistar or SBAS (WAAS) satellite differential (C/A signal) GPS corrections on civilian frequencies. Differential post processing correction was applied to enhance data accuracy when real-time Omnistar or SBAS (WAAS) was unavailable. Each line represents the centerline of a physical section of bridge. Each side of a divided bridge was collected as a separate bride centerline. Bridges with an odd amount of lanes in the direction of collection were collected in the center lane. Bridges with an even amount of lanes were collected from the lane closest to the center of the bridge. Offsets were applied in the field as needed. Process_Date: 20060701 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Georgia Department of Transportation, Office of Transportation Data Contact_Address: Address_Type: mailing and physical address Address: Office of Transportation Data North Annex 5025 New Peachtree Road City: Chamblee State_or_Province: Georgia Postal_Code: 30341 Country: USA Contact_Voice_Telephone: 770-986-1360 Contact_Facsimile_Telephone: 770-986-1056 Contact_Electronic_Mail_Address: http://gis.state.ga.us/ Hours_of_Service: 8:00 AM – 4:45 PM, M-F, Subject to all Official State Holidays Contact_Instructions: Please call or send written request for information or data. Process_Step: Process_Description: Data was downloaded to Trimble Pathfinder Office v. 3.0. Spatial data was checked for quality using georeferenced SDE Atlanta 2004 aerial photo and Mr. SID raster layers in ArcMap-ARCINFO v. 9.x. Multi-pathing errors were removed by deleting vertices. No vertices were added in the editing process. Attribute accuracy was cross checked with BIMS-Bridge Information Management System GIS data layer. All Data was exported out of Pathfinder Office v. 3.0 in geographic coordinates into ArcMap-ArcInfo v. 9.X shapefiles. Process_Date: 20060701 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Georgia Department of Transportation, Office of Transportation Data Contact_Address: Address_Type: mailing and physical address Address: Office of Transportation Data North Annex 5025 New Peachtree Road City: Chamblee State_or_Province: Georgia Postal_Code: 30341 Country: USA Contact_Voice_Telephone: 770-986-1360 Contact_Facsimile_Telephone: 770-986-1056 Contact_Electronic_Mail_Address: gis@dot.state.ga.us http://gis.dot.state.ga.us Hours_of_Service: 8:00 AM – 4:45 PM, M-F, Subject to all Official State Holidays Contact_Instructions: Please call or send written request for information or data. Process_Step: Process_Description: Shapefiles were built for linear analysis in ArcMap-ArcInfo v. 9.x. All reprojections were conducted using ArcMap-ArcInfo v. 9.x using projection and transformation toolset under Data Management Tools in Arc Toolbox. Process_Date: 20060701 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Georgia Department of Transportation, Office of Transportation Data Contact_Address: Address_Type: mailing and physical address Address: Office of Transportation Data North Annex 5025 New Peachtree Road City: Chamblee State_or_Province: Georgia Postal_Code: 30341 Country: USA Contact_Voice_Telephone: 770-986-1360 Contact_Facsimile_Telephone: 770-986-1056 Contact_Electronic_Mail_Address: gis@dot.state.ga.us http://gis.dot.state.ga.us Hours_of_Service: 8:00 AM – 4:45 PM, M-F, Subject to all Official State Holidays Contact_Instructions: Please call or send written request for information or data. Cloud_Cover: 0 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: 75 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0 Longitude_Resolution: 0 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Semi-major_Axis: 0 Denominator_of_Flattening_Ratio: 0 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: BrideCenterline.ddf Attribute: Attribute_Label: SOURCE Attribute: Attribute_Label: COLLECTOR Attribute: Attribute_Label: COUNTY_FIPS TWO Attribute: Attribute_Label: COUNTY_FIPS ONE Attribute: Attribute_Label: FEATURE_TYPE Attribute: Attribute_Label: ROAD_NAME Attribute: Attribute_Label: FEATURE_CROSSED Attribute: Attribute_Label: BRIDGE_ID Attribute: Attribute_Label: GPS_3DLENG Attribute: Attribute_Label: GPS_DATE Attribute: Attribute_Label: GPS_LENGTH Attribute: Attribute_Label: GPS_TIME Attribute: Attribute_Label: AVG_VERT_P Attribute: Attribute_Label: AVG_HORZ_P Attribute: Attribute_Label: CORR_TYPE Attribute: Attribute_Label: MAX_PDOP Attribute: Attribute_Label: RCVR_TYPE Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: GIS Data Clearinghouse - Library Node Contact_Address: Address_Type: mailing and physical address Address: University of Georgia Information Technology Outreach Services 1180 East Broad Street Suite 2076 City: Athens State_or_Province: Georgia Postal_Code: 30602-5418 Country: USA Contact_Voice_Telephone: (706) 542-0246 Contact_Facsimile_Telephone: (706) 542-6535 Contact_Electronic_Mail_Address: https://gis1.state.ga.us/index.asp Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: SHP File_Decompression_Technique: No compression applied Available_Time_Period: Time_Period_Information: Single_Date/Time: Calendar_Date: 2006 Time_of_Day: Unknown Metadata_Reference_Information: Metadata_Date: 20060701 Metadata_Review_Date: Metadata_Future_Review_Date: 20070701 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Georgia Department of Transportation, Office of Transportation Data Contact_Address: Address_Type: mailing and physical address Address: Office of Transportation Data North Annex 5025 New Peachtree Road City: Chamblee State_or_Province: Georgia Postal_Code: 30341 Country: USA Contact_Voice_Telephone: 770-986-1360 Contact_Facsimile_Telephone: 770-986-1056 Contact_Electronic_Mail_Address: gis@dot.state.ga.us http://gis.dot.state.ga.us Hours_of_Service: 8:00 AM – 4:45 PM, M-F, Subject to all Official State Holidays Contact_Instructions: Please call or send written request for information or data. 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: Accessibility to the data shall comply with all relevant Federal, State, and Local laws. All data is considered a public record and subject to the provisions of the federal Open Records Act and the Official Code of Georgia (Chapter 50-18, Article 4 Inspection of Public Records). Metadata_Use_Constraints: This data may be copyrighted by the Regional Development Center with the provision that the Georgia Department of Transportation and the Federal Highway Administration reserve a royalty-free, non-exclusive, and irrevocable license to reproduce, publish, or otherwise use, and authorize others to use, the work for government purposes. Metadata_Security_Information: Metadata_Security_Classification_System: None Metadata_Security_Classification: Unclassified Metadata_Security_Handling_Description: None Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile