Pennsylvania Spatial Data Access

Abstract:

A scope of work was developed in response to a request by the U. S. Army Corps
of Engineers, Philadelphia District. The request was to perform a topographic
change grid analysis for the Frankford 7.5-minute quadrangle, 1:24,000-scale
topographic map, which includes the Wissinoming neighborhood, and the Germantown 7.5-minute quadrangle, which includes the Logan and Feltonville neighborhoods of the City of Philadelphia. The following tasks were performed under this scope of work: A GPS-corrected GIS grid analysis for each quadrangle was completed and is accompanied by documentation that describes procedures and provides metadata of the informational content of the GIS. A high-resolution global positioning system (GPS) survey was conducted for each topographic quadrangle in order to evaluate and correct systematic discrepancies in elevation between the modern and historic surveys. Prior to release, the fully documented GPS-corrected GIS grid analysis for each quadrangle was reviewed for (1) com-pleteness of documentation and for (2) appropriate analysis and discussion of uncertainties.
The following report is in fulfillment of the tasks outlined in this scope of work and was performed by the U. S. Geological Survey for the U. S. Army Corps of Engineers, Philadelphia District under MIPR agreement number: W25PHS93358288.

Purpose:

The U.S. Geological Survey (USGS), working in cooperation with the U. S. Army Corps of Engineers (ACOE), Philadelphia District, has conducted a study of topographic change throughout the Frankford and Germantown 7.5 minute USGS quadrangles, Philadelphia and Montgomery Counties, Pennsylvania and Burlington County, New Jersey. The purpose of this study is to determine the spatial extent of human-induced topographic change during the past 100 years. The USGS has conducted this study in response to severe structural damage and subsequent condemnation of houses within the Philadelphia city limits, due to differential subsidence of fill material within buried stream valleys.

Supplemental_Information:

ArcInfo export format files (*.e00), and Portable Document Format (.pdf) files are available at http://pubs.usgs.gov/of/2000/of00-224/

Explanation of Geologic Map Units

Qt - 	Trenton graval of Lewis
Tpb - 	Pensauken and Bridgeton Formation
Tbm - 	Bryn Mawr Formation
Kp - 	Potomic Formation
Jd - 	Diabase
Trs - 	Stockton Formation
Op - 	Pegmatite
Osg - 	Swarthmore Grandiorite
OCc - 	Conestoga Limestone
Ce -	Elbrook Formation
Cl - 	Ledger Dolomite
Cc - 	Chickies Quartzite
Cza - 	Amphobolite
Czs - 	Serpentinite
Czw - 	Wissahickon Formation
Ya - 	Amphibolite
Ymg - 	Amphibolitic migmatite and related hybrid rocks

Currentness_Reference:

publication date

Use_Constraints:

Although all data and software have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Address:

926A National Center, 12201 Sunrise Valley Drive

Logical_Consistency_Report:

Polygon and chain-node topology present.

Completeness_Report:

The geology polygon coverage data is complete and has been revied for consistency and completeness

Source_Contribution:

This data were developed from the methods explained in Open-File Report-00-224.

Process_Description:

Metadata imported.

Attribute_Definition:

Internal feature number.

Attribute_Definition_Source:

ESRI

Attribute_Definition:

Feature geometry.

Attribute_Definition_Source:

ESRI

Enumerated_Domain_Value_Definition:

GIS Grid analyisis method shows 5 feet or more of positive topographic change or evidence of a buried stream channel.

Enumerated_Domain_Value_Definition:

GIS Grid analyisis method shows 5 feet or more of positive topographic change and evidence of a buried stream channel.

Address:

12201 Sunrise Valley Drive, National Center MS926A

USGS Information Services
Box 25286
Denver, CO 80225 
Phone: (303)-202-4700
Fax:   (303)-202-4693

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:

115 Land and Water building

Geologic map - Topographic Change in Philadelphia, During the Last Century