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The evaluation to determine whether an original FWC land cover classification required correction relied on a confusion matrix which contained all possible combinations of the two input land cover rasters from 1987 and 2003, plus a third "tie breaker" layer developed from near-contemporaneous land use data prepared by Florida's five Water Management Districts (WMDs) and made available on Florida's statewide GIS data depository (FGDL 2012).
Ancillary GIS data provided to assist the reviewers in land-cover interpretation included the Soil Survey Geographic (SSURGO) soils data of the National Conservation Resources Service (FGDL 2012); 1990 and 2004 land-use data from the WMDs (ibid.); and recent high-resolution (0.30-m resolution) natural color imagery from DigitalGlobe.
Parcel data recorded in the FGDL was collected from the Office of the Property Appraiser for Orange County, Florida.
The first release of FGDL in 1998 and the Map Library's large digital spatial collection also contributed to the need for GIS expertise.
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