Building Footprints
Metadata:
- Identification_Information:
- Citation:
- Citation_Information:
- Originator:
- Allegheny County Division of Computer Services Geographic Information Systems Group
- Publication_Date: 2006
- Title: Building Footprints
- Geospatial_Data_Presentation_Form: vector digital data
- Series_Information:
- Series_Name: 2004 Flyover 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".
- Description:
- Abstract:
- Footprints for all buildings and out buildings in Allegheny County. Buildings are captured by following the edge of the roof line. All near orthogonal corners are square. Interum roof lines, such as dormers, are not shown. Minor structures such as carports, decks, patios, stairs, etc. which are part of the structure are not shown. Building Footprints were updated as a result of a flyover in 2004. Buildings less than 400 square feet were not captured. Special consideration was given to garages, less than 400 square feet, and were digitized if greater than 200 square feet.
- 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: -80.373487
- East_Bounding_Coordinate: -79.672725
- North_Bounding_Coordinate: 40.687091
- South_Bounding_Coordinate: 40.180738
- Keywords:
- Theme:
- Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
- Theme_Keyword: structure
- 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 Group
- Contact_Position: GIS Manager
- Contact_Voice_Telephone: 412 350-4774
- Contact_Facsimile_Telephone: 412 350-4754
- Native_Data_Set_Environment:
- Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722
- Cross_Reference:
- Citation_Information:
- Originator:
- Allegheny County Division of Computer Services Geographic Information Systems Group
- Data_Quality_Information:
- 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_Produced_Citation_Abbreviation: Michael Baker Engineers
- Process_Step:
- Process_Description: Data was loaded into ArcSDE
- Source_Produced_Citation_Abbreviation: County GIS Staff
- Process_Step:
- Process_Description: Metadata was created.
- Process_Step:
- Process_Description: Metadata imported.
- Source_Used_Citation_Abbreviation: C:\DOCUME~1\t094246\LOCALS~1\Temp\xml53.tmp
- Spatial_Data_Organization_Information:
- Direct_Spatial_Reference_Method: Vector
- Point_and_Vector_Object_Information:
- SDTS_Terms_Description:
- SDTS_Point_and_Vector_Object_Type: G-polygon
- Point_and_Vector_Object_Count: 542770
- SDTS_Terms_Description:
- SDTS_Point_and_Vector_Object_Type: Label point
- Point_and_Vector_Object_Count: 507123
- SDTS_Terms_Description:
- SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
- Point_and_Vector_Object_Count: 507122
- 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: 1772
- Spatial_Reference_Information:
- Horizontal_Coordinate_System_Definition:
- Planar:
- Map_Projection:
- Map_Projection_Name: 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: 0.000512
- Ordinate_Resolution: 0.000512
- 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
- Entity_and_Attribute_Information:
- Detailed_Description:
- Entity_Type:
- Entity_Type_Label: bfprnts
- 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: SYSTEMID
- Attribute:
- Attribute_Label: USERID
- Attribute:
- Attribute_Label: FEATURECOD
- Attribute_Domain_Values:
- Enumerated_Domain:
- Enumerated_Domain_Value: 210
- Enumerated_Domain_Value_Definition:
- Residential Buildings: Buildings which appear to be primarily residential in nature, including apartment buildings and hotels.
- Enumerated_Domain_Value_Definition_Source: Large Scale Database Quality Control Guide March 1, 1993
- Attribute_Domain_Values:
- Enumerated_Domain:
- Enumerated_Domain_Value: 220
- Enumerated_Domain_Value_Definition:
- Industrial Commercial Buildings: Large Buildings which appear to house activities that are commercial or industrial in nature. Apartment Buildings and Hotels are not included.
- Enumerated_Domain_Value_Definition_Source: Large Scale Database Quality Control Guide March 1, 1993
- Attribute_Domain_Values:
- Enumerated_Domain:
- Enumerated_Domain_Value: 230
- Enumerated_Domain_Value_Definition:
- Public Buildings: Buildings which are owned or used primarily by governmental, non-profit, religious, or charitable organizations, or which serve a public function.
- Enumerated_Domain_Value_Definition_Source: Large Scale Database Quality Control Guide March 1, 1993
- Attribute_Domain_Values:
- Enumerated_Domain:
- Enumerated_Domain_Value: 240
- Enumerated_Domain_Value_Definition:
- Out buildings: Buildings closely associated with a larger building such as a detached garage.
- Enumerated_Domain_Value_Definition_Source: Large Scale Database Quality Control Guide March 1, 1993
- Attribute_Domain_Values:
- Enumerated_Domain:
- Enumerated_Domain_Value: 250
- Enumerated_Domain_Value_Definition:
- Unknown Buildings: Buildings whose use is not readily discernible from an aerial photograph.
- Enumerated_Domain_Value_Definition_Source: Large Scale Database Quality Control Guide March 1, 1993
- Attribute:
- Attribute_Label: UPDATE_YEA
- Attribute:
- Attribute_Label: MODIFIEDBY
- Attribute:
- Attribute_Label: MODIFIEDON
- Attribute:
- Attribute_Label: CREATEDBY
- Attribute:
- Attribute_Label: CREATEDON
- Attribute:
- Attribute_Label: NAME
- Attribute:
- Attribute_Label: SOURCE
- Attribute:
- Attribute_Label: STATUS
- Attribute:
- Attribute_Label: SHAPE_area
- Attribute_Definition: Area of feature in internal units squared.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
- Unrepresentable_Domain: Positive real numbers that are automatically generated.
- Attribute:
- Attribute_Label: SHAPE_len
- Overview_Description:
- Distribution_Information:
- Distributor:
- Contact_Information:
- Contact_Organization_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: 85.032
- Ordering_Instructions: Call for Details
- Metadata_Reference_Information:
- Metadata_Date: 20071031
- Metadata_Contact:
- Contact_Information:
- Contact_Organization_Primary:
- 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: 412 350-4774
- Contact_Facsimile_Telephone: 412 350-4754
- 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:<http://www.esri.com/metadata/esriprof80.html>
- Profile_Name: ESRI Metadata Profile
Generated by
mp version 2.8.6 on Wed Oct 31 14:35:30 2007