Allegheny County - Street Edge of Pavement

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Distributor 1
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:Allegheny County Division of Computer Services Geographic Information Systems Group

Publication_Date:2006

Title:

Allegheny County - Street Edge of Pavement

Geospatial_Data_Presentation_Form:vector digital data

Series_Information:

Series_Name:Base Data

Publication_Information:

Publication_Place:Pittsburgh, PA

Publisher:Allegheny County Division of Computer Services Geographic Information Systems Group

Other_Citation_Details:

Data was updated as a result of a flyover in the spring of 2004. A database field has been defined for all map features named "Update Year". This database field will define which dataset provided each map feature. Map features from the current map will be set to "2004". The earlier dataset map features the earlier dataset map features used to supplement the area near the county boundary will be set to "1993". All new or modified map data will have the value for "Update Year" set to "2004".

Online_Linkage: https://www.pasda.psu.edu

Description:

Abstract:

Edge of Pavements are the edges of all public thoroughfares including paved roads, unpaved roads, bridges, overpasses, tunnels, alleys, stairways and airfield runways.

Paved Roads are roads that are surfaced with concrete or asphalt.  Roads that have been tarred and chipped are also considered paved.  Roads surfaced with gravel or packed dirt are considered Unpaved.  An Alleyway is a road, usually narrower than surrounding roads that runs between, but parallel to, two paved roads.  An Alley can be either paved or unpaved.  Generally, Outbuildings will be adjacent to Alleyways.  Road pavement edges that are underneath bridges or overpasses are coded as Hidden.  Bridges and Overpasses are delineated along the outside edge of the structure.  Portions of bridges that are under other bridges or other objects are coded as Hidden Bridge.  Tunnels are shown as lines connecting the apparent width of the tunnel through the earth.  Stairways are major pedestrian thoroughfares, either paved or wooden, connecting two (2) roads and typically found on steep hills.  Airfield Runways are the edges of Runways, Taxiways and other airfield pavement areas.  Driveways that are greater than 300' in length will be digitized and coded as either Paved Road or Unpaved Road.

Paved Road edges show the width of the paved area.  If the paved road has a paved shoulder, the paved shoulder is shown as part of the paved road.  The placement of an unpaved road is subject to interpretation by the photogrammetrist since the road edge may be indefinite due to the imprecise nature of an unpaved surface.

Driveways that are over 300' in length are digitized.  For a driveway that terminates at a building, it shall be drawn to the building.  Driveways will also have a centerline for its entire length.

Parking lots are not digitized.  The entrance to a parking lot for shopping areas shall be shown.  Driving areas around and through parking lots serving shopping areas and other businesses are considered part of the parking lot.  If the driving area through a parking lot connects to two (2) or more exterior roads, the main thoroughfare through the parking lot shall be shown as a road.

The driving area through an apartment complex or condominium complex shall be digitized as a road.  The road is needed in these areas to show access to the individual dwelling places.

Edges of Pavement that are updated will have the database field StreetCL_FC populated with the Feature Code of the Street Centerline.  (The Street Centerline Feature Code is more descriptive than the general code used for Edge of Pavement.)

Purpose:

Data was developed as part of the effort to establish large scale base data to support a Geographic Information System in Allegheny County

Supplemental_Information:

The original mapping (1992-1993) was created using Pennsylvania State Plane South Zone 3702; North American Horizontal Datum (NAD) 1983; North American Vertical Datum (NGVD) 1929.  As part of the GIS update the horizontal coordinate system has been adjusted to NAD 1983 High Accuracy Reference Network (HARN) 1992 Adjustment and National Geodetic Vertical Datum (NGVD) 1988.  ESRI does not have routines available for the horizontal HARN adjustment or the vertical adjustment.  To accomplish the adjustment of the existing map data an average horizontal and vertical shift was determined.  The average shift was then applied to all map data prior to updating.

The datum shift involved moving the map data a set distance.  The distance the map data was moved:
"	X=0.611'
"	Y=-0.358'
"	Z=-0.5'

Note: The available coordinate system definitions in ArcGIS 8.3 do not include HARN for Pennsylvania.  The horizontal coordinate system defined in the delivered ArcGIS 8.3 Personal Geodatabase is set to NAD83.  This will need to be redefined once ESRI incorporates HARN for Pennsylvania.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date:Spring 2004

Currentness_Reference:

publication date

Status:

Progress:Complete

Maintenance_and_Update_Frequency:As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate:-80.373561

East_Bounding_Coordinate:-79.670692

North_Bounding_Coordinate:40.686984

South_Bounding_Coordinate:40.180747

Keywords:

Theme:

Theme_Keyword_Thesaurus:ISO 19115 Topic Categories

Theme_Keyword:transportation

Place:

Place_Keyword:PA

Place_Keyword:Pittsburgh

Place_Keyword:Clairton

Place_Keyword:Duquesne

Place_Keyword:McKeesport

Access_Constraints:Call for Details

Use_Constraints:

All parties acknowledge that the data is for informational purposes only. The existing digital data is shipped as is and there is no guarantee as to its completeness or accuracy. Allegheny County Division of Computer Services Geographic Information Systems Group is not responsible for any reliance upon said data.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:Allegheny County Division of Computer Services Geographic Information Systems

Contact_Position:GIS Manager

Contact_Address:

Address_Type:mailing and physical address

Address:

621 County Office Building

Address:

542 Forbes Ave.

City:Pittsburgh

State_or_Province:PA

Postal_Code:15219

Country:United States

Contact_Voice_Telephone:(412) 350-4774

Contact_Facsimile_Telephone:(412) 350-4754

Contact_Electronic_Mail_Address:GIShelp@alleghenycounty.us

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.1.1332

Cross_Reference:

Citation_Information:

Originator:Allegheny County Division of Computer Services Geographic Information Systems Group

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Data was subject to visual check by County GIS Staff for attribute accuracy.

Logical_Consistency_Report:

Data was subject to QA/QC process by county GIS Staff at the time it was recieved - 1992-1996 and 2004 - 2005. The "<coverage>#" and "<coverage>-ID" items from the 1993 and 1994 ArcInfo coverages have been transferred to the geodatabase for all map features that have not been modified.  The purpose of the retention of this data is to allow linking of the geodatabase to the original coverages.  The values from the ArcInfo coverage item "<coverage>#" are loaded into the geodatabase field "SystemID".  The values from the ArcInfo coverage item "<coverage>-ID" are loaded into the geodatabase field "UserID".  All map features that have been modified or added during the 2004 update, with the exception of Street Centerlines, will have the value for "SystemID" and "UserID" set to zero (0).

Completeness_Report:

As part of the 2004 update project, mapping was provided covering an area extending 1500 feet beyond the county boundary line. All planimetric, contour and DTM features were delivered in ESRI geodatabase format as County-wide seamless Feature Classes.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

All horizontal control is to NGS Second Order Class I accuracy or better and photo control points are reported on the North American Datum (NAD) 1983 U.S. Survey Feet.  The aerial photography was captured at a negative scale of 1" = 1,600' and is sufficient to produce mapping at 1" = 200' that conforms to National Mapping Accuracy Standards (NMAS).

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value:+/- 5 feet

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

All final elevations are referenced to North American Vertical Datum (NAVD) 1988.  Orthometric heights utilize GEOID 99.  The network adheres to the Federal Geodetic Control Committee Standards (FGCS) guidelines and the final constrained adjustments were made with StarNet Least Squares Adjustment program and are acceptable by the National Geodetic Survey (NGS).

Quantitative_Vertical_Positional_Accuracy_Assessment:

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator:Allegheny County Division of Computer Services Geographic Information Systems Group

Publication_Date:1992

Title:

Baymont Tiles, Base Data

Other_Citation_Details:

Data was created in ArcInfo Coverages on Sun 4/330 Workstations in a distributed environment.

Source_Scale_Denominator:200'

Type_of_Source_Media:digital tape media

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date:Spring 1992

Ending_Date:Spring 1993

Source_Currentness_Reference:

flight time

Source_Citation_Abbreviation:

Baymont Tiles

Source_Contribution:

In the spring of 1992, Baymont Technologies entered into a contract with Allegheny County and Equitable Resources to fly the County and Equitable Resources Service Area to produce planimetric data.  Subcontractors for the project included: Howard Hartman and Associates who provided ground control for the flight; Aerial Data Reduction (ADR) who performed the photography; Centec and Michael Baker Engineers who digitized the data. Photography was produced at a scale of 1"=1500'. Mapping was stereo digitized at a scale of 1"=200'. Digital Orthophotos were not included as a deliverable.

Source_Information:

Source_Citation:

Citation_Information:

Originator:Allegheny County

Publication_Date:2005

Title:

2004 Flyover

Source_Scale_Denominator:200'

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date:Spring 2004

Source_Currentness_Reference:

flight date

Source_Citation_Abbreviation:

2004 Flyover

Source_Contribution:

Digital Globe and Michael Baker Corporation held a contract with Allegheny County to fly the County to produce digital orthophotography and to update planimetric base data for  Allegheny County.  Subcontractors for the project included: T3 Global Strategies, Sweet Solutions and Keystone Aerial Surveys.

Process_Step:

Process_Description:

During Y2K efforts of 1999-2000, data was transferred to Microsoft NT Server running ArcInfo 7 and was made available to county users across the network from a single location.

Process_Date:2000

Process_Step:

Process_Description:

Tiles edgematched to create a single seamless County coverage

Process_Date:2000-2003

Source_Produced_Citation_Abbreviation:

County GIS Staff

Process_Step:

Process_Description:

ArcInfo coverages were created from MicroStation design files using in-house developed translation software. Allegheny County's Data Dictionary was used as the base upon which the ArcInfo structure was designed. Each coverage was subjected to review and inspection using ArcMap. Any revisions or corrections were performed in the MicroStation design files. After any corrections were performed, the files were re-translated, re-plotted and re-checked to confirm correct translations. ArcMap was then used to visually check the planimetric data against the digital orthophoto on a tile basis. The final QC step was to merge all tiles to verify the edgematch. Validation was done using MRF. The ESRI tool LOADDATA was used to convert coverages to the final deliverable format, the geodatabase.

Source_Used_Citation_Abbreviation:

2004 Flyover

Process_Date:Spring 2004

Source_Produced_Citation_Abbreviation:

Michael Baker Engineers

Process_Step:

Process_Description:

Data was loaded into ArcSDE

Process_Time:2005-2006

Source_Produced_Citation_Abbreviation:

County GIS Staff

Process_Step:

Process_Description:

Metadata was created.

Process_Time:Summer 2006

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:100487

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type:Point

Point_and_Vector_Object_Count:1756

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type:Label point

Point_and_Vector_Object_Count:30990

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name:Lambert Conformal Conic

Lambert_Conformal_Conic:

Lambert Conformal Conic

Standard_Parallel:39.933333

Standard_Parallel:40.966667

Longitude_of_Central_Meridian:-77.750000

Latitude_of_Projection_Origin:39.333333

False_Easting:1968500.000000

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:survey feet

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:1.000000

Altitude_Encoding_Method:Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label:AlleghenyCounty_StreetEOP2006

Attribute:

Attribute_Label:Shape

Attribute_Definition:

Feature geometry.

Attribute_Definition_Source:

ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Coordinates defining the features.

Attribute:

Attribute_Label:SYSTEMID

Attribute:

Attribute_Label:SHAPE

Attribute_Definition:

Feature geometry.

Attribute_Definition_Source:

ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Coordinates defining the features.

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:USERID

Attribute:

Attribute_Label:OBJECTID

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:FEATURECOD

Attribute:

Attribute_Label:UPDATE_YEA

Attribute:

Attribute_Label:STREETCL_F

Attribute:

Attribute_Label:SHAPE_len

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Organization:Allegheny County Division of Computer Services Geographic Information Systems Group

Contact_Position:GIS Manager

Contact_Address:

Address_Type:mailing and physical address

Address:

621 County Office Building

Address:

542 Forbes Avenue

City:Pittsburgh

State_or_Province:PA

Postal_Code:15219-2952

Country:USA

Contact_Voice_Telephone:412 350-4774

Contact_Facsimile_Telephone:412 350-4754

Resource_Description:Call for Details

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size:66.284

Ordering_Instructions:

Call for Details

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:Pennsylvania Spatial Data Access (PASDA)

Contact_Address:

Address_Type:mailing address

Address:

115 Land and Water building

City:University Park

State_or_Province:Pennsylvania

Postal_Code:16802

Country:United States

Contact_Voice_Telephone:(814) 865 - 8792

Contact_Electronic_Mail_Address:pasda@psu.edu

Distribution_Liability:

The USER shall indemnify, save harmless, and, if requested, defend those parties involved with the development and distribution of this data, their officers, agents, and employees from and against any suits, claims, or actions for injury, death, or property damage arising out of the use of or any defect in the FILES or any accompanying documentation. Those parties involved with the development and distribution excluded any and all implied warranties, including warranties or merchantability and fitness for a particular purpose and makes no warranty or representation, either express or implied, with respect to the FILES or accompanying documentation, including its quality, performance, merchantability, or fitness for a particular purpose. The FILES and documentation are provided "as is" and the USER assumes the entire risk as to its quality and performance. Those parties involved with the development and distribution of this data will not be liable for any direct, indirect, special, incidental, or consequential damages arising out of the use or inability to use the FILES or any accompanying documentation.

Metadata_Reference_Information:

Metadata_Date:20080310

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person:Kathryn Reed

Contact_Organization:Allegheny County Division of Computer Services Geographic Information Systems Group

Contact_Position:System Supervisor, GIS

Contact_Address:

Address_Type:mailing and physical address

Address:

621 County Office Building

Address:

524 Forbes Avenue

City:Pittsburgh

State_or_Province:PA

Postal_Code:15219-2952

Country:USA

Contact_Voice_Telephone:412 350-5126

Contact_Facsimile_Telephone:412 350-4754

Contact_Electronic_Mail_Address:kreed@county.allegheny.pa.us

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:

Profile_Name:ESRI Metadata Profile