Impervious surface area for Southwest Pennsylvania, 2000


Identification_Information:
Citation:
Citation_Information:
Originator:Toby Carlson, Penn State University
Publication_Date:2003
Title:
Impervious surface area for Southwest Pennsylvania, 2000
Edition:Rev. 2003
Geospatial_Data_Presentation_Form:raster digital data
Publication_Information:
Publication_Place:University Park, PA
Publisher:Penn State University, Dept. of Meteorology
Online_Linkage: ftp://www.pasda.psu.edu/pub/pasda/isa_pa/pa2000isaa_sw.zip
Description:
Abstract:
Impervious surface area for Pennsylvania was estimated from Thematic Mapper data using algorithms developed by Dr. Toby Carlson.  The Value attribute indicates percentage of the 25 meter grid cell that is impervious and range from 0 to 100 and use integer rather than decimal values for reduced storage volume.  Date of the imagery ranged from 1999 to 2002, availability depended on extent of cloud cover at time of acquisition.  All images were collected for the late Spring or Summer months (May-August).  The Pennsylvania Department of Transportation supported the construction of the impervious surface data, with technical assistance from Eric Warner and Deborah Slawson.
Purpose:
The impervious surface data was generated to support hydrologic investigations. Impervious surfaces promote runoff during and following precipitation events. Runoff impacts both quantity and quality of receiving waters. Excessive quantities of runoff promote erosion and flooding. Runoff water acquires pollutants from the impervious surface over which it flows. Pollutants can then be transported to a receiving water body. Impervious surface area is also a useful tool in assessing urbanization and urban sprawl, including the effect of urbanization on surface microclimate.
Supplemental_Information:
ESRI GRID format layers have been zip compressed to retain directory structure.  After downloading file, unzip using the the 'retain directory structure.'  This will create a directory under the current directory with the grid name, i.e. pa2000isaa_ne, which will contain the GRID layer.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date:1999
Ending_Date:2002
Currentness_Reference:
ground condition
Status:
Progress:Complete
Maintenance_and_Update_Frequency:None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -80.605790
East_Bounding_Coordinate: -77.585966
North_Bounding_Coordinate: 40.975806
South_Bounding_Coordinate: 39.660265
Keywords:
Theme:
Theme_Keyword_Thesaurus:ISO 19115 Topic Categories
Theme_Keyword:Impervious surface area
Theme_Keyword:Hydrologic satellite data
Theme_Keyword:transportaion
Theme_Keyword:planningCadastre
Theme_Keyword:structure
Place:
Place_Keyword:Pennsylvania
Access_Constraints:No restrictions on usage.
Use_Constraints:
For educational/demonstration purposes only. The Originator, Publisher and Distributor exclude any and all implied warranties and make no warranty or representation with respect to the data files or accompanying documentation, including quality, performance, merchantability or fitness for a particular purpose. These data files and documentation are provided 'as is' and the User assumes the entire risk as to their quality and performance.
These data are not to be redistributed for commercial profit. Reproduction or redistribution of this digital data set without permission of the Originator/Publisher is expressly forbidden. The Originator and Publisher should be clearly cited in any product derived from this data. Any modifications to this data must be described in any digital or hardcopy product derived from this data.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person:Dr. Toby Carlson
Contact_Organization:Department of Meteorology, Penn State University
Contact_Position:Professor
Contact_Address:
Address_Type:mailing address
Address:
Dept. of Meteorology, 6th fl., Walker Bldg.
City:University Park
State_or_Province:PA
Postal_Code:16802
Country:USA
Contact_Electronic_Mail_Address:tnc@essc.psu.edu
Browse_Graphic:
Browse_Graphic_File_Name: http://www.pasda.psu.edu/preview/isa_pa/pa2000isaa_ne.gif
Browse_Graphic_File_Type:JPEG
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Data_Quality_Information:
Attribute_Accuracy:
Logical_Consistency_Report:
Availability of suitable imagery required that imagery captured at different times between 1985 and 1987 were used.
Completeness_Report:
Thematic Mapper imagery was gathered from a three year span of flights to ensure complete coverage of the state of Pennsylvania.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:Dr. Toby Carlson
Publication_Date:2003
Title:
Fractional Vegetation Cover for Pennsylvania, 2000
Publication_Information:
Publication_Place:University Park, PA
Publisher:Penn State University, Dept. of Meteorology
Source_Scale_Denominator:250000
Type_of_Source_Media:online
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date:1999
Ending_Date:2002
Source_Citation_Abbreviation:
fvca
Source_Contribution:
Fractional vegetation for estimation of vegetation
Source_Information:
Source_Citation:
Citation_Information:
Originator:Dr. Toby Carlson
Publication_Date:Unpublished Material
Title:
Pennsylvania Land Use, 5-classification recode, 2000
Source_Scale_Denominator:250000
Type_of_Source_Media:online
Source_Citation_Abbreviation:
recode2000
Process_Step:
Process_Description:
The impervious surface area depends partly on the landuse classification and partly on the fractional vegetation cover (fvca) images. The assumption is made that the non-vegetated fraction of pixels classified as urban is impervious. Pixels classified as non-urban are assumed to represent totally pervious surfaces. As such, therefore, the constraint on the 1985 images referred to above will cause the ISA and urban fraction (but not the fractional vegetation cover) to be somewhat underestimated in the 1985 image.

Pixels that became de-urbanized in the landuse classification between 1985 and 2000 are not accepted, which imposes a somewhat restrictive condition on the earlier image (1985) that any pixel not urban in 2000 must also be not urban in the earlier images. Since the easiest mistake to make in classification is to mistake a bright, dry field to be urban, all pixels in the earlier image that were not urban in the later one but classified urban in the earlier one are assumed to be in to be in the bare soil/scrub category. This tends to underestimate the impervious surface area and urban cover a bit on the 1985 image, but has no effect on the fractional vegetation cover.

For complete information on the processes and algorithms used see the following:
Carlson, T.N. and D.A. J. Ripley, 1997: On the relationship between NDVI, fractional vegetation cover and leaf area index.  Remote Sensing of the Environ.,, 62, 241-252.

Gillies. R. R. and T. N. Carlson, 1995: Thermal remote sensing of surface soil water content with partial vegetation cover for incorporation into climate models. J. Appl. Meteor., 34, 745-756.

Hebble, E. E., T. N. Carlson and K. Daniel, 2001: Impervious surface area and residential housing density: a satellite perspective. Geocarto International, 16 13-18.
Source_Used_Citation_Abbreviation:
fvca2000
Source_Used_Citation_Abbreviation:
recode2000
Process_Date:2002
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method:Raster
Raster_Object_Information:
Raster_Object_Type:Grid Cell
Row_Count:11742
Column_Count:19130
Vertical_Count:1
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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
Resource_Description:downloadabledata
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Metadata_Reference_Information:
Metadata_Date:20051108
Metadata_Contact:
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
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