Pennsylvania Spatial Data Access

Abstract:

Paved and unpaved parking lots that accommodate more than ten (10) cars.

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:

Data meets or exceeds map accuracy standards in effect during the spring of 1992. Baymont Technologies held 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 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.

Currentness_Reference:

Original data was derived from aerial photography flown in the spring of 1992 for the eastern half of the County and the spring of 1993 for the western half of the County.

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.

Address:

621 County Office Building

Address:

542 Forbes Ave.

Logical_Consistency_Report:

Data was subject to QA/QC process at the time it was recieved (1992-1996).  Data was produced in a series of 1,362 tiles measuring about 4,600 feet X 3,500 feet.  Tiles are numbered in a clockwise spiral fashion starting with #1 at the point in downtown Pittsburgh.  Data from most tiles was delivered by 1996 when GIS Operations ceased in Allegheny County, with the exception of one person in the Health Department.

Completeness_Report:

There is data for all of the municipalities in the county, with some holes in some layers.  It is estimated that between 16 and 91 tiles of data might be missing in  a layer.

Horizontal_Positional_Accuracy_Report:

Geodetic reference framework was created using NAD 83, the result of the latest geodetic readjustment by NGS at the time.  Photography was produced at a scale of 1"=1,500'.  Mapping was stereo digitized at a scale of 1"=200'. Map data meets or exceeds map accuracy standards in effect during the spring of 1992.

Vertical_Positional_Accuracy_Report:

Geodetic reference framework was created using NAGVD 29 in conformance with the monument densification program outlined in the County of Allegheny Geodetic Control Report of 1991.

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_Description:

Tiles edgematched to create a single seamless County coverage

Process_Description:

Metadata imported.

Process_Description:

Metadata imported.

Attribute_Definition:

Internal feature number.

Attribute_Definition_Source:

ESRI

Attribute_Definition:

Feature geometry.

Attribute_Definition_Source:

ESRI

Attribute_Definition:

Length of feature in internal units.

Attribute_Definition_Source:

ESRI

Enumerated_Domain_Value_Definition:

Paved Parking Lots: Paved Parking Lots that accommodate more than 10 cars.

Enumerated_Domain_Value_Definition_Source:

Large Scale Database Quality Control Guide, March 1, 1993

Enumerated_Domain_Value_Definition:

Unpaved Parking Lots: Unpaved Parking Lots that accommodate more than 10 cars.

Enumerated_Domain_Value_Definition_Source:

Large Scale Database Quality Control Guide, March 1, 1993

Address:

621 County Office Building

Address:

542 Forbes Avenue

Ordering_Instructions:

Call for Details

Address:

115 Land and Water building

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.

Address:

621 County Office Building

Address:

524 Forbes Avenue

Allegheny County - Parking