Read Me File 4/2013

The zip file for 2006-2013 Imagery contains the following files:

*.JP2 - JPEG-2000 compressed image file (orthoimagery tile)

*.tab - MapInfo georegistration file type

*.J2W - JPEG-2000 world file which contains georegistration information for use with
ESRI ArcView and ArcMap

*.aux - auxillary files used with ESRI ArcGis
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The zip file for imagery between 2000 & 2005 contains the following files:

*.sid - Mr Sid format compressed image file (orthoimagery tile)

*.tab - MapInfo georegistration file type

*.sdw - world file - ascii file that contains real-world tranformation information for image,
	use with ESRI products

*.aux - auxillary files used with ESRI ArcGis

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00ST_*.tab, 00ST_*.map, 00ST_*.id, 00ST_*.dat - 4 MapInfo seamless table files.  Each zip file contains a
	seamless table associated with all the jp2 or sid files for the geographic area included.
	The seamless tables MUST be in the same directory as the *.tab and *.jp2or*.sid files.
	
	
00IC*.dbf - Image catalog (ESRI).  Each zip file contains a 00IC*.dbf file associated with of all the jp2 or sid files for the geographic area included in the zip file. 
The image catalog uses a system environment variable, $NYSDOP.
 In order to use the image catalog, the user must set the system environment variable on
their machine before using the ESRI software.If the environment variable does not work (likely in Arc 10.1),
the $NYSDOP should be replaced by the actual path to the imagery on the user's system in an edited version of the image catalog.
Another option in ArcGis is to create and load a "Raster Catalog" in a Geodatabase using the "unmanaged" option and loading the catalog from
a workspace where the imagery is stored. 
	The computer system variable is set in the Control Panel > System > Environment Tab
		For Variable: type nysdop
		Value: enter the full path of the directory where the *.j2w or *.sdw and the
 *.jp2 or *.sid files reside on the machine.

County image index(es) - These files serve as an index for all the image files covering the county. There is a separate index for each combination of film type and resolution. 
Filenames and image dates are provided. The indexes are provided in ArcView shapefile and
MapInfo .TAB file formats.  The naming convention is as follows:

		ccc_ss_fff_indexyy.*, where

			ccc = the 3 letter county name abbreviation
			ss = the coordinate system (SP=State Plane, U=UTM)
			fff = film type (i.e. - COL, CIR, or PAN)
			yy = the year flown

	
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Note for 2000 - 2007: 1) Geographic areas may have any of the 3 film types: 'Natural Color', 'Panchromatic' and 'Color Infrared'.
         Hence the zip files may have more than one Seamless Table and Image Catalog for each film type. 

For example-
         
	 Seamless Tables:  Natural Color  (00ST_*_*_*col.tab) 
			   Panchromatic   (00ST_*_*_*pan.tab)
			   Color Infrared (00ST_*_*_*cir.tab)

	 Image Catalog:	   Natural Color  (00IC_*_*_*col.dbf) 
			   Panchromatic   (00IC_*_*_*pan.dbf)
			   Color Infrared (00IC_*_*_*cir.dbf)

      2) Zip files for quadrangles will only include orthoimagery (*.sid) and associated
	 files for the geographic areas flown in the Annual Lot programs that have been completed.  
	 As new areas are flown, the quadrangle zip files will be updated.
	 
Note for 2008- 2012:All imagery is 4 - band digital camera imagery. There are two main resolutions, 2ft and 1ft pixel with 1/2 ft. pixel in selected areas.
		Depending on software and bands displayed, the user can view color using bands 1,2 & 3 or color infrared using bands 4,1 & 2.

For more information on using the files visit our Frequently Asked Questions and General Help Page,
http://gis.ny.gov/gateway/mg/faq.htm