USGS High Resolution Orthoimagery for Harrisburg, Pennsylvania
Identification_Information:
Citation:
Citation_Information:
Originator:U.S. Geological Survey
Publication_Date:2012
Title:
USGS High Resolution Orthoimagery for Harrisburg, Pennsylvania
Geospatial_Data_Presentation_Form:remote-sensing image
Series_Information:
Series_Name:High Resolution Orthoimagery
Issue_Identification:0.1
Publication_Information:
Publication_Place:Sioux Falls, SD
Publisher:U.S. Geological Survey
Online_Linkage: https://www.pasda.psu.edu
Online_Linkage: http://gisdata.usgs.gov/tdds/downloadfile.php?TYPE=ortho&ORIG=META&FNAME=18TUK390505_201111_0x3000m_CL_1.zip
Online_Linkage: http://nationalmap.gov/viewer.html
Description:
Abstract: 
"This data set consists of 0.3-meter pixel resolution (approximately 1-foot), natural color orthoimages covering the urban area footprint.  An orthoimage is remotely sensed image data in which displacement of features in the image caused by terrain relief and sensor orientation have been mathematically removed. Orthoimagery combines the image characteristics of a photography with the geometric qualities of a map.  The design accuracy is estimated not to exceed 3-meters NSSDA 95% confidence (0.88-meters Root Mean Squared (RMSE) Error XY (0.62 meter RMSE
X or Y). Each orthoimage provides imagery over a 1500-meter by 1500-meter block on the ground.  There is no image overlap between adjacent files.  The projected
coordinate system is UTM with a NAD83 datum.  The naming convention is based on the U.S. National Grid (USNG), taking the coordinates of the SW corner of the
orthoimage." 

Data received at Earth Resources Observation and Science Center (EROS) were verified as:
Projection:   NAD_1983_UTM_Zone_18N
Resolution:  0.3000 m
Type:  Natural Color

and resampled to align to the U.S. National Grid (USNG). The naming convention is based on the U.S. National Grid (USNG), taking the coordinates of the SW corner of the orthoimage.  The metadata were imported and updated for display through The National Map at     Chip-level metadata are provided in HTML and XML format. Data were compressed utilizing IAS software. The compression was JPEG2000 Lossy Compressed. The file format created was .jp2.
Purpose: 
"The data depicts geographic features on the surface of the earth. It was created to provide easily accessible geospatial data which is readily available to enhance the capability of Federal, State, and local emergency responders, as well as plan for homeland security efforts.This data also supports The National Map." A digital orthoimage is a geometrically accurate photographic record of landscape conditions at the time of the corresponding aerial photography. As such, High Resolution Orthoimagery is useful for a variety of applications, such as environmental monitoring, facility engineering/maintenance, city/county planning, property line review, etc. The digital orthoimage can be used alone or as a raster basemap for corresponding vector line mapping. The detailed focus of High Resolution Orthoimagery provides emergency responders critical information in determining the best evacuation routes, alternative routes and safe access to aid. High Resolution Orthoimagery assists law enforcement personnel in determining the best locations to place surveillance cameras in high-traffic urban areas and popular attractions. The data assists Federal, State and local emergency responders in planning for homeland security efforts. This data also supports The National Map.
Supplemental_Information: 
"This Project Level Metadata covers the Harrisburg, PA 133 UA portion of the Task Order.  The Harrisburg, PA AOI covers 513 square miles. A total of 686 natural color orthos were produced to cover this area." 
The data obtained through The National Map is considered to be the "best available" data from USGS.  Information in quotation marks, initial processing steps, accuracy reports, and source information is taken directly from the original metadata.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date:201111
Currentness_Reference: 
ground condition
Status:
Progress:Complete
Maintenance_and_Update_Frequency:Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate:-76.891690637517
East_Bounding_Coordinate:-76.8737032148747
North_Bounding_Coordinate:40.2032453973689
South_Bounding_Coordinate:40.1894519103899
Keywords:
Theme:
Theme_Keyword_Thesaurus:None
Theme_Keyword:digital spatial data
Theme_Keyword:0.3 meter orthoimage
Theme_Keyword:rectified image
Theme_Keyword:orthophoto
Theme_Keyword:natural color orthophoto
Theme_Keyword:orthoimage
Theme_Keyword:image map
Theme:
Theme_Keyword_Thesaurus:ISO 19115 Category
Theme_Keyword:imageryBaseMapsEarthCover
Theme_Keyword:010
Theme_Keyword:geoscientificInformation
Theme_Keyword:008
Theme_Keyword:location
Theme_Keyword:013
Theme:
Theme_Keyword_Thesaurus:American Society of Photogrammetry and Remote Sensing
Theme_Keyword:National Standards for Spatial Digital Accuracy (NSSDA)
Place:
Place_Keyword_Thesaurus:U.S. Department of Commerce, 1995, Countries, dependencies, areas of special sovereignty, and their principal administrative divisions, Federal Information Processing Standard 10-4,): Washington, D.C., National Institute of Standards and Technology
Place_Keyword:United States
Place_Keyword:U.S.
Place_Keyword:US
Place:
Place_Keyword_Thesaurus:U.S. Department of Commerce, 1987, Codes for the identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard 5-2): Washington, D.C., National Institute of Standards and Technology
Place_Keyword:PA
Place:
Place_Keyword_Thesaurus:Counties and County Equivalents of the States of the United States and the District of Columbia (FIPS Pub 6-3)
Place_Keyword:York County
Place:
Place_Keyword_Thesaurus:Geographic Names Information System
Place_Keyword:Harrisburg
Place_Keyword:Pennsylvania
Access_Constraints:Any downloading and use of these data signifies a user's agreement to comprehension and compliance of the USGS Standard Disclaimer. Insure all portions of metadata are read and clearly understood before using these data in order to protect both user and USGS interests.
Use_Constraints: 
There is no guarantee of warranty concerning the accuracy of the data.  Users should be aware that temporal changes may have occurred since this data set was collected and that some parts of this data may no longer represent actual surface conditions.  Users should not use this data for critical applications without a full awareness of its limitations.  Acknowledgement of the originating agencies would be appreciated in products derived from these data.  Any user who modifies the data is obligated to describe the types of modifications they perform.  User specifically agrees not to misrepresent the data, nor to imply that changes made were approved or endorsed by the U.S. Geological Survey.  Please refer to http://www.usgs.gov/privacy.html for the USGS disclaimer.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:U.S. Geological Survey
Contact_Position:Customer Services Representative
Contact_Address:
Address_Type:mailing and physical
Address: 
USGS National Geospatial Program Office
Address: 
12201 Sunrise Valley Drive
City:Reston
State_or_Province:VA
Postal_Code:20192
Country:USA
Contact_Voice_Telephone:1-888-ASK-USGS (1-888-275-8747)
Contact_Voice_Telephone:Unknown
Contact_Facsimile_Telephone:Unknown
Contact_Electronic_Mail_Address:tnm_help@usgs.gov
Hours_of_Service:Monday through Friday 8:00 AM to 4:00 PM Eastern Time Zone USA
Contact Instructions: 
Please visit http://www.usgs.gov/ask/ to contact us.
Browse_Graphic:
Browse_Graphic_File_Name: http://tdds.cr.usgs.gov/browse/ortho/18T/UK/18TUK390505_201111_0x3000m_CL_1.jpg
Browse_Graphic_File_Description:
Tiled High Resolution Orthoimagery (HRO)
Browse_Graphic_File_Type:JPEG
Data_Set_Credit: 
Digital Aerial Solutions, LLC (DAS)
8409 Laurel Fair Circle, Suite 100
Tampa, FL 33610 "and" U.S. Geological Survey
Security_Information:
Security_Classification_System:None
Security_Classification:Unclassified
Security_Handling_Description:N/A
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: 
Radiometry is verified by visual inspection of the digital orthophoto.  Slight systematic radiometric differences may exist between adjacent orthoimage files; these are due primarily to differences in source image capture dates and sun angles along flight lines.  These differences can be observed in an image's general lightness or darkness when it is compared to adjacent orthoimage file coverages. Tonal balancing may be performed over a group of images during the mosaicking process which may serve to lighten or darken adjacent images for better color tone matching.
Logical_Consistency_Report: 
"All GeoTIFF tagged data and image file sizes are validated using commercial GIS software to ensure proper loading
before being archived.  This validation procedure ensures correct physical format and field values for tagged
elements.  Seamlines and tile edges are visually inspected. Seamlines mismatches are not corrected unless the
overall displacement exceeds one meter." 
Logical consistency is implicit in the raster image data structure. Source imagery is cloud free.
Completeness_Report: 
"Orthoimages are visually inspected for completeness to ensure that no gaps or image misplacements exist within
and between adjacent images.  These images are derived by mosaicking multiple images to ensure complete
coverage.  Source imagery is cloud free.  Photography was flown during leaf-off in deciduous vegetation regions.
Coastal areas and international boundary regions may have areas without images (void areas) in parts of the
coverage.  These void areas have a radiometric value of either zero (black) or 128 (uniform gray)."
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: 
"The horizontal positional accuracy and the assurance of that accuracy depend, in part, on the accuracy of the data inputs to the rectification process.  The location of existing USGS photoidentifiable ground control and contractor aerotriangulation points were evaluated on the Geotiff image and compared with their ground values in order to determine an overall accuracy for each test block of orthoimages within the project.   After image coordinate measurement was completed for each block, an RMSE for the diagonal error was calculated for the orthoimages within the block. This value is an estimate of the horizontal accuracy of the tile expressed in meters." 
The relative accuracy is assembled by comparing rectified images generated from adjacent strips of imagery. The absolute accuracy is assessed by measuring the ground control points in the rectified image against the actual surveyed co-ordinate position. The testing is for overall accuracy.  This data has been produced to be fully compliant with the National Map Accuracy Standards (NMAS) for mapping at this scale.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value:0.50
Horizontal_Positional_Accuracy_Explanation: 
"Federal Geographic Data Committee, 1998, Geospatial Positioning Accuracy Standard, Part 3, National Standard for Spatial Data Accuracy, FGDC-STD-007.3-1998"
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: 
There is no vertical accuracy component to orthophotography.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:Digital Aerial Solutions, LLC
Publication_Date:2011
Title:
ADS40 digital imagery
Geospatial_Data_Presentation_Form:remote-sensing image
Type_of_Source_Media:digital imagery
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date:20111112
Ending_Date:20111113
Source_Currentness_Reference:
ground condition
Source_Citation_Abbreviation:
ADS40 digital imagery
Source_Contribution: 
The digital imagery mission was composed of a total of 2 lifts.  Imagery (1-ft, 0.3 meter GSD) was obtained at an altitude of 9,450 feet above ground level on 12 and 13 Nov 2011.  The missions were flown with a Leica ADS40 (Sensor Head 52) digital camera with ABGPS and IMU. This imagery provides the data for the digital orthoimage. 
Imagery was acquired on the following dates -
Lift                    Date
0111122011           12 Nov 2011
0211132011           13 Nov 2011
Source_Information:
Source_Citation:
Citation_Information:
Originator:Digital Aerial Solutions, LLC
Publication_Date:2011
Publication_Time:Unknown
Title:
Geodetic Ground Control Survey
Geospatial_Data_Presentation_Form:model
Type_of_Source_Media:digital
Source_Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date:20111112
Single_Date/Time:
Calendar_Date:20111113
Single_Date/Time:
Calendar_Date:20111115
Single_Date/Time:
Calendar_Date:20111116
Source_Currentness_Reference:
Ground Condition
Source_Citation_Abbreviation:
GPS ground control
Source_Contribution: 
Horizontal and vertical control was used to establish positions and elevations for reference and correlation purposes and as input to the aerotriangulation process.
Control consists of photoidentifiable surveyed ground control for ground reference.  A total of 16 photoidentifiable ground control points were collected.
Source_Information:
Source_Citation:
Citation_Information:
Originator:U.S. Geological Survey
Publication_Date:20111231
Publication_Time:Unknown
Title:
Harrisburg, PA 3 Meter USGS DEM
Type_of_Source_Media:digital file
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date:20100518
Source_Currentness_Reference:
Ground Condition
Source_Citation_Abbreviation:
DEM
Source_Contribution: 
USGS format elevation data with a 3-meter grid post interval and covering a 7.5-minute x 7.5-minute quadrangle in extent.  Used to provide ground elevations for
orthorectification process.
Source_Information:
Source_Citation:
Citation_Information:
Originator:Digital Aerial Solutions, LLC
Publication_Date:Unpublished material
Publication_Time:Unknown
Title:
Airborne GPS/IMU Data
Type_of_Source_Media:digital file
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date:20111112
Ending_Date:20111113
Source_Currentness_Reference:
Ground Condition
Source_Citation_Abbreviation:
ABGPS/IMU
Source_Contribution: 
Airborne GPS (ABGPS) and IMU data are collected with an onboard dual frequency GPS survey unit and a corresponding IMU system in combination with the digital
imagery.  The GPS data provides the position of the imagery at the time of capture while the IMU system records instantaneous changes in position and attitude of
the sensor.  The GPS/IMU, base station, and ground control processing are an important step towards the development of accurate orthoimages.
Process_Step:
Process_Description: 
"Source Imagery - ADS40 (Sensor Head 52) Digital Camera Imagery
Control - Airborne GPS/IMU supplemented with photo identifiable field control
Aerotriangulation, Orthorectification - SOCET SET, ORIMA Elevation Model - USGS DEM Mosaic - OrthoVista
The following describes the digital production sequence.
1.  The raw ADS40 (Level-0) data and associated GPS and IMU data for each mission is downloaded from the hard drives and checked to confirm that no files have been corrupted and that all data can be successfully downloaded.
2.  The GPS and IMU data are post-processed along with the base station data to produce a precise position and attitude stream for each line of imagery.  Post processing uses the high frequency readouts of the IMU to verify the
GPS data and to provide instantaneous positioning of each line of imagery between GPS recordings. Likewise, the IMU attitude data is corrected for bias/drift and
transformed to real world coordinates by using the GPS data.  This process creates Level-1 rectified imagery which is an approximately geo-positioned image.
3.  The ADS40 production process uses aerial triangulation techniques to combine the short-term accuracy of the IMU with high global accuracy of GPS. In combination with the minimum required number of ground control points (GCPs), aerial triangulation delivers best fitting results on the ground.  The extra information added to the system by automatic tie point measurements (APM) leads to very reliable orientation results where photogrammetric measurements serve to control IMU/GPS measurements and vice versa.
4.  The results of the APM are run through a combined bundle adjustment process to further refine the measured
image coordinates and the position and attitude values from IMU and GPS computed by IMU/GPS post
processing.  The bundle adjustment process equally compensates for systematic errors such as the
misalignment between IMU and sensor axes, IMU/GPS drift, and the datum difference between IMU/GPS and
ground control coordinate system.  This results in a very accurate and precise determination of the parameters of
exterior orientation which are later used for Orthorectification.
5.  The orthorectification process uses the raw Level-0 data as the input imagery source to avoid repeated
re-sampling of the imagery to yield the best possible image quality and accuracy.  The raw Level-0 true color imagery
is orthorectified to the DEM using the adjusted position and orientation results from the aerial triangulation phase. The orthorectified strip of imagery is called the Level-2 data.
6.  The resulting images are then mosaicked and color balanced.
7.  The final 1500-meter by 1500-meter tiles are clipped out and the imagery is output in uncompressed GeoTIFF
format with no overlap.
8.  The completed natural color digital orthophotos are checked for image quality.  Minor artifacts are corrected
using Adobe Photoshop in an interactive editing session. Digital tiles are assigned final names based on the U.S.
National Grid."
Process_Date:201111
Process_Step:
Process_Description: 
Data received at Earth Resources Observation and Science Center (EROS) were verified as:
Projection:   NAD_1983_UTM_Zone_18N
Resolution:  0.3000 m
Type:  Natural Color

and resampled to align to the U.S. National Grid (USNG). The naming convention is based on the U.S. National Grid (USNG), taking the coordinates of the SW corner of the orthoimage.   The naming convention is based on the U.S. National Grid (USNG), taking the coordinates of the SW corner of the orthoimage.  The metadata were imported and updated for display through The National Map at <http://nationalmap.gov/viewer.html>    Chip-level metadata are provided in XML and HTML format. Data were compressed utilizing IAS software. The compression was JPEG2000 Lossy Compressed. The file format created was .jp2.
Process_Date:201203
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:U.S. Geological Survey
Contact_Position:Customer Services Representative
Contact_Address:
Address_Type:mailing and physical
Address: 
USGS National Geospatial Program Office
Address: 
12201 Sunrise Valley Drive
City:Reston
State_or_Province:VA
Postal_Code:20192
Country:USA
Contact_Voice_Telephone:1-888-ASK-USGS (1-888-275-8747)
Contact_Voice_Telephone:Unknown
Contact_Facsimile_Telephone:Unknown
Contact_Electronic_Mail_Address:tnm_help@usgs.gov
Hours_of_Service:Monday through Friday 8:00 AM to 4:00 PM Eastern Time Zone USA
Contact Instructions: 
Please visit http://www.usgs.gov/ask/ to contact us.
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method:Raster
Raster_Object_Information:
Raster_Object_Type:Pixel
Row_Count:5000
Column_Count:5000
Vertical_Count:1
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name:Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number:18
Transverse_Mercator:
Scale_Factor_at_Central_Meridian:0.999600
Longitude_of_Central_Meridian:-75.0000
Latitude_of_Projection_Origin:0.0
False_Easting:500,000
False_Northing:0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method:row and column
Coordinate_Representation:
Abscissa_Resolution:0.3000
Ordinate_Resolution:0.3000
Planar_Distance_Units:meters
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
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name:North American Vertical Datum of 1988
Altitude_Resolution:1.00000
Altitude_Distance_Units:meters
Altitude_Encoding_Method:Explicit elevation coordinate included with horizontal coordinates
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Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview: 
Natural color orthoimagery is organized in three color bands or channels which represent the red, green, and blue portions of the spectrum.  Each image pixel is assigned a triplet of numeric values, one for each color band.  Numeric values range from 0 to 255. Areas where data is incomplete due to lack of full image coverage are represented with the numeric value of 0.
Entity_and_Attribute_Detail_Citation: 
U.S. Department of the Interior, U.S. Geological Survey, 1999, Standards for Digital Orthoimagery: Reston, VA
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:U.S. Geological Survey
Contact_Position:Customer Services Representative
Contact_Address:
Address_Type:mailing and physical
Address: 
USGS National Geospatial Program Office
Address: 
12201 Sunrise Valley Drive
City:Reston
State_or_Province:VA
Postal_Code:20192
Country:USA
Contact_Voice_Telephone:1-888-ASK-USGS (1-888-275-8747)
Contact_Voice_Telephone:Unknown
Contact_Facsimile_Telephone:Unknown
Contact_Electronic_Mail_Address:tnm_help@usgs.gov
Hours_of_Service:Monday through Friday 8:00 AM to 4:00 PM Eastern Time Zone USA
Contact Instructions: 
Please visit http://www.usgs.gov/ask/ to contact us.
Resource_Description:Downloadable Data
Distribution_Liability: 
Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made by the USGS regarding the use of the data on any other system, nor does the act of distribution constitute any such warranty.  Data may have been compiled from various outside sources.  Spatial information may not meet National Map Accuracy Standards.  This information may be updated without notification. The USGS shall not be liable for any activity involving these data, installation, fitness of the data for a particular purpose, its use, or analyses results.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name:JP2
Format_Version_Number:ArcGIS 9.3
Format_Specification: 
Raster
Transfer_Size:0.001
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://nationalmap.gov/viewer.html
Access_Instructions:
The URL http://nationalmap.gov/viewer.html provides a map interface that allows for viewing and data downloads within a customer defined area of interest. Zoom tools are available that can be used to investigate areas of interest on the map interface. The download tool allows the customer to capture layers from the map, utilizing The National Map process for downloading. The generated zip file can be unzipped and imported into various user software applications.
Online_Computer_and_Operating_System:
Not available for dissemination
Fees:None
Turnaround:Variable
Technical_Prerequisites:
ESRI ArcGIS Suite and/or Arc/Info or other compatible software, and supporting operating systems.
Available_Time_Period:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date:2012
Ending_Date:unknown
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:Pennsylvania Spatial Data Access (PASDA)
Contact_Address:
Address_Type:mailing and physical 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
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.
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Metadata_Reference_Information:
Metadata_Date:2012
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:U.S. Geological Survey
Contact_Position:Customer Services Representative
Contact_Address:
Address_Type:mailing and physical
Address: 
USGS National Geospatial Program Office
Address: 
12201 Sunrise Valley Drive
City:Reston
State_or_Province:VA
Postal_Code:20192
Country:USA
Contact_Voice_Telephone:1-888-ASK-USGS (1-888-275-8747)
Contact_Voice_Telephone:Unknown
Contact_Facsimile_Telephone:Unknown
Contact_Electronic_Mail_Address:tnm_help@usgs.gov
Hours_of_Service:Monday through Friday 8:00 AM to 4:00 PM Eastern Time Zone USA
Contact Instructions: 
Please visit http://www.usgs.gov/ask/ to contact us.
Metadata_Standard_Name:FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version:FGDC-STD-001-1998
Metadata_Time_Convention:local time
Metadata_Access_Constraints:None
Metadata_Use_Constraints:
None
Metadata_Security_Information:
Metadata_Security_Classification_System:None
Metadata_Security_Classification:Unclassified
Metadata_Security_Handling_Description:
None
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