Administrative Services

Floodplain

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator:
Allegheny County Division of Computer Services Geographic Information Systems Group
Publication_Date: 2000
Title: Floodplain
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Publication_Information:
Publication_Place: Pittsburgh, PA
Publisher:
Allegheny County Division of Computer Services Geographic Information Systems Group
Online_Linkage:
\\GISSQL01\GISData\gisstaff\Data_Clip\Shapefiles_for_Clip\floodplain.shp
Description:
Abstract:
In an effort to expedite the permit review process for Water Obstruction and Encroachment Applications, the Pennsylvania Department of Environmental Protection initiated a plan to replace hard-copy maps with digital GIS sets. The project is referred to as the 105 Spatial Data System (105SDS) Pennsylvania river floodplains and coastal floodplains are two of many spatial data sets that were used in the 105SDS project. As a result of work completed by Law Environmental, Inc. on the statewide low-level radioactive waste siting project, DEP received two coverages depicting river and coastal floodplains. However, due to the process used in constructing these data sets, there were many areas throughout the state in which floodplains were not digitized. The primary purpose of this task was to complete the digital floodplain mapping in these areas. Purpose:INTENDED USE OF DATA; Created to do permit reviews for Water Obstruction and Encroachment Applications. LIMITATIONS OF DATA; Due to the nature of transferring the floodplains from the Federal Emergency Management Agency maps to plotted 1:24000 scale maps this coverage should be considered to be the "best representation" of the data but not as accurate as, for example, a map of Global Positioning System's floodplain coordinates
Purpose:
Data was acquired as part of the effort to establish a Geographic Information System in Allegheny County.
Supplemental_Information:
Data meets or exceeds map accuracy standards in effect during the spring of 1992.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1997
Currentness_Reference: creation date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -80.362619
East_Bounding_Coordinate: -79.675950
North_Bounding_Coordinate: 40.681905
South_Bounding_Coordinate: 40.185105
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
Theme_Keyword: InlandWaters
Theme_Keyword: biota
Theme_Keyword: environment
Theme_Keyword: geoscientificinformation
Place:
Place_Keyword: PA
Place_Keyword: Allegheny County
Place_Keyword: Pittsburgh
Place_Keyword: Clairton
Place_Keyword: Duquesne
Place_Keyword: McKeesport
Place_Keyword: Southwest PA
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 9.1.0.780
Cross_Reference:
Citation_Information:
Originator:
Allegheny County Division of Computer Services Geographic Information Systems Group

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Data is based on Allegheny County base data which was produced at a scale of 1"=200'.
Logical_Consistency_Report:
Data is based on other GIS data developed and maintained by Allegheny County GIS Staff.
Completeness_Report: There is data for all of the floodplains in Allegheny County
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Data is based on county base data horizontal positional accuracy
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: +/- 5 feet
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: Data is based on county base data vertical positional accuracy
Quantitative_Vertical_Positional_Accuracy_Assessment:
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Office of Remote Sensing for Earth Resources, Penn State University
Publication_Date: 1996
Title: Floodplains of Allegheny County PA
Other_Citation_Details: Data downloaded from PASDA
Source_Scale_Denominator: 200"
Type_of_Source_Media: Windows NT Server
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 2000
Source_Currentness_Reference: publication date
Source_Contribution: a coverage of Floodplains was obtained from PASDA
Process_Step:
Process_Description:
The Law Enviromental coverage was brought into workstation ARC/INFO. Plots were made using this coverage, Pennsylvania Department of Transportation roads, streams and municipal boundries. Each plot was 3 quadrangle sheets (7.5 minute by 7.5 minute) large at 1:24000 scale.
Process_Date: 1997
Process_Step:
Process_Description:
The Law Enviromental coverage was then clipped into 8 regions (using the Pennsylvania Department of Transportation county coverage as a guideline) for manageability reasons. Then each region was copied to a single percision and exported (with the "n" option) and then transferred for import into PC ARC/INFO.
Process_Date: 1997
Process_Step:
Process_Description:
The available Federal Emergency Management Agency Flood Insurance Map/ Federal Hazard Boundry maps were used to transfer the remaining floodplains onto the above mentioned plots and were then digitized directly into the Law Environmental regional coverage
Process_Date: 1997
Process_Step:
Process_Description:
Once digitizing was finished the coveraged were exported and transfered back to the workstation where they were imported, cleaned and then edited (in ARCedit) to remove any dangles and any other digitizing errors. Usually the coverages were cleaned again and if not cleaned then they were built.
Source_Used_Citation_Abbreviation: W:\1metadata\template.xml
Process_Date: 1997
Process_Step:
Process_Description:
Labels were created (createlabels), and then the coverage was built again.
Process_Date: 1997
Process_Step:
Process_Description:
The item maptype was added to the .pat file and the floodplains were then coded with their corresponding code. some minor editing was done at this step such as removing boundries between floodplaines with the same code. Maptype codes reflect the level of detail of the origional source map higher values mean more map detail.
Process_Date: 1997
Process_Step:
Process_Description:
When each coverage was finished some quality measurements were done. The Pennsylvania Department of transportation streams were brought up in the background to double check the floodplain accuracy.
Process_Date: 1997
Process_Step:
Process_Description:
Coverages were built again. When the top 4 regions were complete they were joined together same with the bottom 4 regions. The coverages were cleaned and the boundries between the regions were removed as well as making sure all of the border floodplains matched.
Process_Date: 1997
Process_Step:
Process_Description:
When the top and bottom halves were finished the two were joined together and the boundry running through the middle of the state was removed. The coverage was built, and the command unsplit (ARCedit) was run to remove psuedonodes. The command createlabels was run to update the label-ids in the .pat file and then the coverage was built one last time.
Process_Date: 1997
Process_Step:
Process_Description:
School coverage was reprojected to Lambert Conformal Conic and shape files were produced for Pennsylvania Counties.
Process_Date: 1998

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: 502
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:
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: floodplain
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: AREA
Attribute:
Attribute_Label: PERIMETER
Attribute:
Attribute_Label: FLOODPLA_
Attribute:
Attribute_Label: FLOODPLA_I
Attribute:
Attribute_Label: MAPTYPE
Attribute:
Attribute_Label: FLOODPLAIN

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: 66.284
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 15:01:30 2007