Basemaps/Surrounding_Counties (MapServer)

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Service Description: This document serves as the metadata for the Maryland Historical Counties Dataset shapefile for use in a geographic information system (GIS). That file may be downloaded without charge from this Web site (www.newberry.org/ahcbp); see also Distribution_Information, below. In addition, an interactive map of Maryland's Historical Counties Dataset is available for operation and viewing through the Web site by means of ArcIMS, a program produced by Environmental Systems Research Institute (ESRI). ArcIMS draws its boundary data for the interactive map from the Maryland Historical Counties Dataset shapefile. The interactive map is projected while the downloadable shapefile is not. Here are descriptions of the sources and methods used to gather and process the information that appears in the shapefile and in the interactive map so that users can evaluate the quality and utility of the data. The comprehensive Maryland Historical Counties Dataset shapefile holds the polygons, metadata, and attribute data for every different configuration of every county or county equivalent in Maryland, dated to the day, from the creation of the first county on 24 January 1638, through 31 December 2000. The Historical Counties Dataset, together with a number of supplementary cartographic data files and text files, enable users easily to employ a geographic information system for the analysis and display of county-related historical data. First among the non-cartographic data files is the Maryland Comprehensive Database (a tab-delimited text file that can be imported into a database or spreadsheet program), which provides descriptions of all known changes in state and county boundaries, changes in county organization and attachments, and changes in status and name, together with citations to the sources. These data include unmappable boundary changes, which usually means changes too small to plot as polygons at compilation scale, changes whose shapes could not be plotted at compilation scale (e.g., shift of a boundary line from the centerline of a road to one shoulder or the other), and changes that could not be mapped for other reasons (e.g., the location of the change could not be determined). In the Comprehensive Database, there is a separate entry for each county involved in each event. That facilitates assembling all the events pertaining to a single county. In addition to the Comprehensive Database, there are five supplemental texts. These are: (1) a comprehensive County Index (includes proposed and extinct counties and non-county areas and provides cross references for name changes, with hyperlinks to corresponding individual county chronologies), (2) a Consolidated Chronology that organizes all the data by date, combining all the counties involved in an event into a single, composite entry, (3) a set of Individual County Chronologies, each one covering all the changes in a single county or equivalent, (4) a Bibliography that lists the primary and secondary sources found useful in the historical research, and (5) a Commentary on the research problems and materials that were remarkable or unusual in the process of historical compilation (Not every state requires a commentary.). A "Read Me" file introduces all these files and indicates how to get started with them.

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Surrounding_Counties (0)

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Spatial Reference: 102685 (2248)

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