Readme file for pamap/south_central_pa directory

The images in this directory of the FTP site are uncompressed TIFF images provided through
the PAMAP program.  Imagery is currently provided in the tiling scheme in which the collection was made
available.  And index map to this scheme is available in the Orthos_2003_Index.pdf file in this directory
and the index is made available in shapefile format as well.  

Within the /tiles directory the imagery is arranged according to the file name as follows
	/tiles
		/10000000
		/20000000
		/30000000
		/40000000
		/50000000


In the future quadrangle mosaics of the imagery will be made available and further imagery acquired through the 
PAMAP program will be made available through: ftp://imagery.pasda.psu.edu/pamap 

2003 USGS High Resolution Orthoimage collection for South Central Pennsylvania 

Abstract: Orthoimagery for south-central Pennsylvania captured in April of 2003. 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 photograph with the geometric qualities of a map. For this dataset, the natural color orthoimages 
were produced at 2-feet pixel resolution. The design accuracy is estimated not to exceed 4.8 feet at 
the 95% confidence level. Each orthoimage provides imagery for a 10,000 by 10,000 feet block on the 
ground. The projected coordinate system is Pennsylvania State Plane with a NAD83 datum. There is no 
image overlap been adjacent files. The ortho image filenames were derived from the northwest corner 
of each ortho tile using the first four digits of the northing and easting coordinates referenced to 
the Pennsylvania State Plane coordinate system, followed by the State designator "PA", and the State 
Plane zone designator "S". 

Each tile represents a portion of a ten county area located in south-central Pennsylvania. The 
following ten counties are covered within the project area: Fulton County, Franklin County, 
Adams County, York County, Huntingdon County, Cumberland County, Dauphin County, Mifflin County, 
Juniata County, Perry County. 

Contact information:
Commonwealth of Pennsylvania
Governor's Office of Administration
Office for Information Technology
Bureau of Geospatial Technologies
210 Finance Building
Harrisburg, PA  17130
email: RA_GeospatialTech@state.pa.us