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20 May 2007
"Purpose:
These data have been created as a result of the need for having geospatial
data immediately available and easily accessible in order to provide geographic
reference for Federal, State, and local emergency responders, as well as
for homeland security efforts."
Compare to birdseye views:
nsa-bird/nsa-birdseye.htm
Sparse cars in lots,
usually
packed, indicates weekend/holiday flyover.
Eyeball
National Security Agency Headquarters
April 2005
|
| From
http://seamless.usgs.gov |
| Click photo for full-size high-resolution photo, each 3-4MB in size. |
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Metadata from the Seamless web site:
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Identification_Information:
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Citation:
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Citation_Information:
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Originator: U.S. Geological Survey
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Publication_Date: 20060209
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Title:
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USGS High Resolution Orthoimagery for Anne Arundel County, Maryland
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Geospatial_Data_Presentation_Form: SDE raster digital data
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Series_Information:
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Series_Name: State Orthoimagery
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Issue_Identification: 0.1
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Publication_Information:
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Publication_Place: Sioux Falls, SD
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Publisher: U.S. Geological Survey
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Online_Linkage:
<http://seamless.usgs.gov>
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Description:
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Abstract:
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"The Anne Arundel County, Maryland 2005 digital natural-color orthophotography
was collected during April 2005 leaf-off conditions at a resolution of 20
centimeters to obtain a pixel resolution of 6 inches for all final orthos.
The imagery was flown at approximately 6,300 ft AMT with a 30% sidelap. The
data covers Anne Arundel County, MD with approximately 518 square miles of
coverage. The digital orthos were delivered to Anne Arundel County in 2500'x2500'
uncompressed 24-bit natural color TIFF files and in individual MrSID compressed
files. Accuracy is better than ASPRS Class 1 standards for 1 inch equals
100 ft scale orthophotography with a horizontal accuracy of plus or minus
1 foot."
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Purpose:
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These data have been created as a result of the need for having geospatial
data immediately available and easily accessible in order to provide geographic
reference for Federal, State, and local emergency responders, as well as
for homeland security efforts. Orthoimages also serve a variety of purposes,
from interim maps to field references for earth science investigations and
analysis. The digital orthoimage is useful as a layer of a geographic information
system. These data can be used to provide reference information for Web browsers
and for map applications at a scale of 1:100,000 or smaller. Larger scale
orthoimagery such as digital orthophoto quadrangles will be more accurate,
but often at the expense of timely updates. "Anne Arundel County, MD has
a goal to develop and maintain a seamless county wide GIS base data set.
EarthData is providing a county wide imagery base layer which will enable
the county to extract valuable information from in order to accomodate their
resource planning and GIS efforts."
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Supplemental_Information:
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The data obtained through The Seamless Server is considered to be the "best
available" data from USGS. Historical data and other data may be obtained
by contacting Customer Services, Center for Earth Resources Observation &
Science, at 1-800-252-4547. Information in quotation marks, initial processing
steps, accuracy reports, and source information is taken directly from the
original metadata.Spatial-specific information not available