{ "currentVersion": 10.71, "id": 59, "name": "Historic Structures", "type": "Feature Layer", "description": "This data set contains historic structure locations and attributes as recorded at the Florida Master Site File.DATA VERSION: July 2018: This data set updates and replaces all previous versions of the Florida Master Site File historical structures data layer. This version incorporates newly recorded structures and updates of previously recorded locations and attributes.DATA CURRENCY: Data from the Florida Master Site File are continually updated. On average, the Site File processes over 6,000 additional historic structure forms each year. This data layer is only current as of the date of this document. Contact the Florida Master Site File for updated data layers.DATA SOURCE(S): Source data were created by the Division of Historical Resources. The original location information is based on field reports and address data which have been submitted to the Florida Master Site File by many and varied individuals, groups, institutions, and cultural resource firms. Submissions to the Site File are sometimes accepted from amateurs as well as professionals. The accuracy of submitted information cannot always be verified.DERIVATION METHODS FOR DATA: Structure locations in this data layer were automated using one of three methods; address matching by DHR, on-screen digitizing by DHR, or automated by an external party. The PLOT_MTHD field indicates whether a structure was address matched(M) by the FMSF, digitized(D) by the FMSF, or automated externally(X). Roughly 60% of the structure locations (statewide) were generated by address matching.The address matching was carried out using the geocoding function of ArcView 3.0a. Addresses were matched against the ESRI U.S. Street Database (1997). The line data for the ESRI database (based on Tiger line data) was digitized at a 1:100,000 scale. Due to the small scale and numerous attribute errors in the reference street data, the geocoding process resulted in typical positional errors (as spot-checked against surveyor provided maps) of 20 to 100 meters with occasional larger errors possible. In some cases this results in a structure location point appearing on the wrong side of the street or in the wrong block when displayed against a scanned 1:24,000 USGS quadrangle. It is recommended that the data user compare the locations of the address matched structures to the ESRI U.S. Street Database and other background layers (such as scanned quads) to most accurately interpret locational information.Not all structures and addresses adequately matched the ESRI U.S. Street Database. Structures which did not address match were on-screen digitized in ArcView 3.0a, 3.1 and 3.2 using scanned, georeferenced USGS 1:24,000 quadrangles as a background. Location information for these structures was culled from a variety of sources, including: surveyor-provided maps (the vast majority fall into this category), verbal location descriptions included on the site form, commercially available street atlases, county road maps, county property appraiser databases, city directories, and direct telephone contact with surveyors or property owners. The accuracy of the digitized locations is, in general, somewhat better than that of the address matched structures. However the overall coverage should be considered a 1:100,000 scale data layer.A small number of structure locations in this data set were automated by an outside entity. In general, these locations are deemed by the Site File to be of better quality/accuracy than those address matched by DHR.After the data layers had been completed they were converted from ArcView shapefiles to ArcInfo coverages using the SHAPEARC command in ArcInfo 7.1. In September 2003, the base coverages were converted to an ESRI personal geodatabase format and are currently maintained in geodatabase format. 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