TITLE: 2011 Digital Orthophotos - St. Johns County

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DATA SOURCE(S):                    Florida Department of Transportation.
SCALE OF ORIGINAL SOURCE MAPS:     
GEODATASET EXTENT:                 

PUBLICATION DATE:                  20110627
TIME PERIOD OF CONTENT:            20101228
DOWNLOAD LINK:                     http://www.fgdl.org/metadataexplorer/explorer.jsp

Imagery Flight Date Info

County			Flight dates

Alachua			Mar 2011
Baker			Jan 2011
Bay			Dec 2012-Feb 2013
Bradford		Dec 2012
Brevard			Feb 2012
Broward			Dec 2011
Calhoun			Jan 2013
Charlotte		Jan 2011
Citrus			Dec 2010-Feb 2011
Clay			Nov 2010
Collier			Dec 2011-Jan 2012
Columbia		Oct 2012
DeSoto			Jan 2011
Dixie			Dec 2012-Jan 2013
Duval			Nov 2010
Escambia		Jan 2013
Flagler			Apr 2011
Franklin		Feb 2013
Gadsden			Nov 2012
Gilchrist		Dec 2012-Jan 2013
Glades			Jan 2012
Gulf			Jan 2013
Hamilton		Dec 2012
Hardee			Jan 2011
Hendry			Jan 2011
Hernando		Dec 2010-Feb 2011
Highlands		Jan 2011
Hillsborough		Dec 2010-Jan 2011
Holmes			Dec 2012
Indian River		Apr 2012
Jackson			Oct 2102
Jefferson		Nov 2012
Lafayette		Dec 2012-Jan 2013
Lake			Mar 2011
Lee			Jan-Mar 2011
Leon			Jan-Feb 2012
Levy			Dec 2012
Liberty			Feb 2013
Madison			Dec 2012
Manatee			Dec 2010-Jan 2011
Marion			Dec 2010
Martin			Apr 2012
Miami-Dade              Dec 2011-Mar 2012
Monroe			Jan-Mar 2012
Nassau			Dec 2010
Okaloosa		Dec 2012-Apr 2013
Okeechobee		Jan-Mar 2011
Orange                  Jan 2012
Osceola                 Oct 2011
Palm Beach		Nov-Dec 2010
Pasco			Dec 2010-Jan 2011
Pinellas		Dec 2010
Polk			Jan 2011
Putnam			Nov 2010
Santa Rosa	        Oct 2012
Sarasota                Dec 2010-Mar 2011
Seminole		Jan 2012
St. Johns		Dec 2010
St. Lucie		Apr 2012
Sumter			Dec 2010-Feb 2011
Suwannee		Dec 2012-Mar 2013
Taylor			Mar 2013
Union			Dec 2012
Volusia			Jan 2012
Wakulla			Nov 2012
Walton			Jan 2013
Washington		Dec 2012


This dataset consists solely of raster digital data.  Logical consistency, which applies to vector data, does not apply to this dataset.

This dataset covers the entire county.  Visual inspection in Intergraph's IRAS/C software ensures that the imagery completely covers the extent of the county with no gaps.

This imagery was acquired on 12/28/2010.

The purpose of the project is to provide current digital orthophotos. The digital orthophotos are used to support land management and acquisition, planning, and engineering for the state of Florida.

Orthophotography meets the USGS horizontal accuracy requirement of 5.06 feet at the 95 percent confidence level based on the National Standard for Spatial Data Accuracy (NSSDA).

Acknowledgement of the Florida Department of Transportation would be appreciated when using or deriving products from these data.

NO WARRANTIES: This data is made available by the Florida Department of Transportation on an "as is," "as available" basis without warranties of any kind, express or implied, including, but not limited to, those of TITLE, MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE or NON-INFRINGEMENT or any warranty arising from a course of dealing, usage, or trade practice.  DISCLAIMER OF LIABILITY:  The user of this data assumes all responsibility and risk for the use of the data.  Under no circumstances, including negligence, shall the Florida Department of Transportation or its employees be liable for any DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY or CONSEQUENTIAL DAMAGES, or LOST PROFITS that result from the use, misuse or inability to use the data.  Nor shall the Florida Department of Transportation, or its employees be liable for any damages resulting from or related to reliance upon the data; mistakes in the data, omissions from the data, interruptions, deletion of files, computer viruses, errors in the data, defects in the data, or any failure of performance, communications failure, theft, destruction or unauthorized access to the data.

The imagery was collected at an altitude of 9500 ft using an Intergraph Digital Mapping Camera (DMC).  Image quality was verified during the post flight review phase. Factors considered during this review included but were not limited to the presence of smoke and/or cloud cover, contrails, light conditions and sun glint.  Ground control consisted of photo identifiable surveyed points.  Aerotriangulation point measurement accomplished with a combination of automatic and manual point measurement.  Pass and tie points were automatically generated.  Control was manually measured.  A single bundle adjustment was performed on the entire county.   A Digital Terrain Model (DTM) was generated consisting of the pass and tie points automatically generated during aerotriangulation and breaklines that were collected stereoscopically.  The photography was orthorectified using the DTM.  Seamlines were generated using a combination of automated and manual seamlines generation.  Color balancing was applied during the mosaic process to create seamless imagery to the highest extent practically achievable.   The DMC collects twelve bit image data which requires radiometric conversion to output in standard eight bit image channels. Final image tiles were reviewed for artifacts and anomalies and adjusted as part of quality control procedures. When necessary, local corrections to the imagery  
were performed to minimize such effects.
Process Date: Unknown

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605 Suwannee St. MS 5L
Tallahassee, FL
32399-0450
850-245-1585