National Elevation Dataset 10 Meter 7.5x7.5 minute quadrangle for Pennsylvania


Identification_Information:
Citation:
Citation_Information:
Originator:U.S. Geological Survey (USGS)
Publication_Date:2006 - 2010
Title:
National Elevation Dataset 10 Meter 7.5x7.5 minute quadrangle for Pennsylvania
Publication_Information:
Publication_Place:Fort Worth, TX
Publisher:National Cartography & Geospatial Center
Online_Linkage: http://seamless.usgs.gov/
Online_Linkage: http://www.pasda.psu.edu
Description:
Abstract:
The U.S. Geological Survey has developed a National Elevation Database (NED).The NED is a seamless mosaic of best-available elevation data. The 7.5-minute elevation data for the conterminous United States are the primary initial source data. In addition to the availability of complete 7.5-minute data, efficient processing methods were developed to filter production artifacts in the existing data, convert to a consistent datum, edge-match, fill slivers of missing data at quadrangle seams, recast the data to a consistent geographic projection and convert all elevation values to decimal meters as a consistent unit of measure.

NED has a resolution of one-third arc-second (approximately 10 meters) for much of the conterminous United States, Hawaii and Puerto Rico in a NAD83 datum. There is a resolution of two arc-seconds for Alaska and the datum is NAD27.

NED at 10 meters is created using the same methods outlined above with the source data being mostly the 10m DEMs. DEMs at 5 meters, 1/3 arc-second, and 1/9 arc-second maps are also used where available. In some cases, the 10m NED is resampled from LIDAR or created using aerial photography.

One of the effects of the NED processing steps is a much-improved base of elevation data for calculating slope and hydrologic derivatives. Artifact removal greatly improves the quality of the slope, shaded-relief, and synthetic drainage information that can be derived from the elevation data.  Geospatial elevation data are used by the scientific and resource management communities for global change research, hydrologic modeling, resource monitoring, mapping, and visualization applications.

NRCS has elected to ONLY serve NED 10 which is 10 meter or better and not NED 10 which was resampled from 30 meter. NRCS also serves the maps in a UTM projection. These two facts differentiate the maps from those served at http://seamless.usgs.gov/. 
Purpose:
Geospatial elevation data are utilized by the scientific and resource management communities for global change research, hydrologic modeling, resource monitoring, mapping, and visualization applications.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date:1999
Currentness_Reference:
publication date
Status:
Progress:Complete
Maintenance_and_Update_Frequency:As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate:-77.471603
East_Bounding_Coordinate:-76.958397
North_Bounding_Coordinate:40.069698
South_Bounding_Coordinate:39.719891
Keywords:
Theme:
Theme_Keyword_Thesaurus:ISO 19115 Topic Categories
Theme_Keyword:7.5-MINUTE DEM
Theme_Keyword:CARTOGRAPHY
Theme_Keyword:DEM
Theme_Keyword:DIGITAL ELEVATION MODEL
Theme_Keyword:DIGITAL MAPPING
Theme_Keyword:EARTH SCIENCE
Theme_Keyword:EDC
Theme_Keyword:EROS
Theme_Keyword:GEODATA
Theme_Keyword:GIS
Theme_Keyword:LAND SURFACE
Theme_Keyword:LANDFORMS
Theme_Keyword:MAPPING
Theme_Keyword:RASTER
Theme_Keyword:TERRAIN ELEVATION
Theme_Keyword:TOPOGRAPHY
Theme_Keyword:USGS
Theme_Keyword:Elevation
Place:
Place_Keyword_Thesaurus:GCMD Location Keywords
Place_Keyword:Pennsylvania
Access_Constraints:None
Use_Constraints:
None. Acknowledgement of the originating agencies would be appreciated in products derived from these data. 

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_Organization_Primary:
Contact_Organization:National Cartography & Geospatial Center
Contact_Position:USDA Natural Resources Conservation Service
Contact_Address:
Address_Type:mailing address
Address:
501 W. Felix St.
City:Fort Worth
State_or_Province:Texas
Postal_Code:76115
Country:United States
Contact_Voice_Telephone:817-509-3400
Contact_Facsimile_Telephone:817-509-3469
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Data_Quality_Information:
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
A plan for assessing the overall accuracy of the National Elevation Dataset (NED) based on independent high-accuracy geodetic control is currently under development. The accuracy described will be in the terms used in the FGDC Content Standards for Framework Land Elevation Data . Accuracy will be determined and reported using the methodology specified in the FGDC National Standard for Spatial Data Accuracy.

Until an independent overall assessment of the accuracy of NED is completed, it is best to refer to published information on the accuracy of the source digital elevation models (DEM's) from which NED was assembled. The primary source data were the USGS 7.5-minute (30-meter or 10-meter resolution) DEM's. Gaps in the 7.5-minute DEM coverage were filled with data from USGS 30-minute (2-arc-second resolution) or 1-degree (3-arc-second resolution) DEM's. The USGS Data Users Guide 5 for DEM's (traditionally known as the "blue book"), last published in 1993, contains a general discussion of DEM accuracy and a brief description of the accuracy testing methodology.

The DEM data users guide also describes the classification levels of standard USGS DEM products. The level of a DEM is defined, in part, on the basis of its accuracy.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value:10
Horizontal_Positional_Accuracy_Explanation:
NED sources for Pennsylvania 30-meter and 10-meter resolution DEM data, 10-meter data was resampled to 30-meter resolution for assembly of the nationwide dataset.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:U.S. Geological Survey
Publication_Date:1996
Title:
USGS 7.5 minute Digital Elevation Model Data
Publication_Information:
Publication_Place:Sioux Falls, South Dakota, USA
Publisher:U.S. Geological Survey
Source_Scale_Denominator:24000
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date:unknown
Source_Currentness_Reference:
ground condition
Source_Citation_Abbreviation:
DEM
Source_Contribution:
Initial elevation data
Source_Information:
Source_Citation:
Citation_Information:
Originator:Pennsylvania Department of Transportation, Bureau of Planning and Research, Cartographic Information Division
Publication_Date:2004
Title:
Pennsylvania County Boundaries, 2004
Publication_Information:
Publication_Place:Harrisburg, PA
Publisher:Pennsylvania Dept. of Transportation
Online_Linkage: http://www.pasda.psu.edu/documents.cgi/padot/boundary_layers/padot-county_2004.xml
Source_Scale_Denominator:24000
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date:Unknown
Source_Currentness_Reference:
ground condition
Source_Citation_Abbreviation:
countbnd
Source_Contribution:
boundaries for clipping
Process_Step:
Process_Description:
USGS identified existing DEM data at the highest available resolution.  The majority is 30-meter 1:24000 scale data with 10-meter data used where available for the conterminous U.S.  Data was projected into geographic decimal degrees and datums were transformed to NAD83 and NAVD88.  Data with a horizontal resolution finer than 30-meters was resampled to 30-meter resolution before merging into the national dataset. All elevation units were converted to decimal meters.  Procedures were applied to correct and/or minimize artifacts found in the source DEM. 1x1 degree tiles were created and edge of 7.5 minute sources were matched.  These 1x1 degree tiles were merged to create two grid files that covered the entire state of Pennsylvania. A more detailed explanation of these processes performed at USGS can be found at: http://gisdata.usgs.gov/NED/default.asp.
Source_Used_Citation_Abbreviation:
DEM
Process_Date:1999
Process_Step:
Process_Description:
NED files were acquired as 1 x 1 degree ARC/INFO grids from USGS were merged to create two grids covering the Pennsylvania.
Process_Date:1999
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:U.S. Geological Survey
Process_Step:
Process_Description:
GRID files obtained on CD-ROM from USGS were merged to create a single GRID layer. This layer was clipped to the state boundary and cells falling outside the state boundary set to 'no data'. 
Process_Date:1999
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:Pa. Bureau of Topographic and Geologic Survey
Process_Step:
Process_Description:
Some anomalously high elevation values due to incorrect conversion of vertical units in the original USGS process were corrected at PaBTGS.  These areas were primarily in Butler County. 
Process_Date:2003
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:Pa. Bureau of Topographic and Geologic Survey
Process_Step:
Process_Description:
State wide corrected GRID layer from PaBTGS was clipped into county files, converted to DEM format and packaged for download. 
Source_Used_Citation_Abbreviation:
countbnd
Process_Date:200404
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:PASDA
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method:Raster
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name:Albers Conical Equal Area
Albers_Conical_Equal_Area:
Albers Conical Equal Area
Standard_Parallel:40
Standard_Parallel:42
Longitude_of_Central_Meridian:-78
Latitude_of_Projection_Origin:39
False_Easting:0
False_Northing:0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method:Coordinate Pair
Coordinate_Representation:
Abscissa_Resolution:30
Ordinate_Resolution:30
Planar_Distance_Units:meters
Geodetic_Model:
Horizontal_Datum_Name:North American Datum of 1983
Ellipsoid_Name:Geodetic Reference System 80
Semi-major_Axis:6378137
Denominator_of_Flattening_Ratio:298.257
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name:North American Vertical Datum of 1988
Altitude_Distance_Units:meters
Altitude_Encoding_Method:Explicit elevation coordinate included with horizontal coordinates
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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:PA
Postal_Code:16802
Country:USA
Contact_Voice_Telephone:(814) 865 - 8792
Contact_Electronic_Mail_Address:pasda@psu.edu
Resource_Description:downloadabledata
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.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name:DEM
File_Decompression_Technique:zip
Transfer_Size:2-8 MB
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: ftp://www.pasda.psu.edu/pub/pasda/ned/nedc-adams.zip
Access_Instructions:
http://www.pasda.psu.edu
Fees:none
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:National Cartography & Geospatial Center
Contact_Person:Customer Services Representative
Contact_Address:
Address_Type:mailing and physical address
Address:
501 Felix St., Bldg 23
City:Fort Worth
State_or_Province:Texas
Postal_Code:76115
Country:United States
Contact_Voice_Telephone:817-509-3400
Contact_Facsimile_Telephone:817-509-3469
Distribution_Liability:
Although these data have been processed successfully on a computer system at the U.S. Department of Agriculture, no warranty expressed or implied is made by the Agency regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. The U.S. Department of Agriculture, nor any of its agencies are liable for misuse of the data, for damage, for transmission of viruses, or for computer contamination through the distribution of these data sets. The U.S. Department of Agriculture prohibits discrimination in its programs on the basis of race, color, national origin, sex, religion, age, disability, political beliefs, and marital or familial status. (Not all prohibited bases apply to all programs.) 
Standard_Order_Process:
Fees:$50 per CD-ROM
Ordering_Instructions:
http://datagateway.nrcs.usda.gov
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Metadata_Reference_Information:
Metadata_Date:201201
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:Pennsylvania Spatial Data Access (PASDA)
Contact_Position:Metadata Coordinator
Contact_Address:
Address_Type:mailing address
Address:
115 Land and Water Building
City:University Park
State_or_Province:PA
Postal_Code:16802
Country:USA
Contact_Voice_Telephone:814-865-8792
Contact_Electronic_Mail_Address:pasda@psu.edu
Metadata_Standard_Name:FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version:FGDC-STD-001-1998
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