This map type rarely includes the names of landowners, however they often provide clues as to the ways in which the land was parceled off or subdivided as well as indications of land use at the time of survey. Whereas the maps of the Bronx and Staten Island are examples of contemporary surveys that were the results of a much more scientifically rigorous process that expresses changes in elevation with contour lines and spot height calculations. The facsimile of the British head quarters map and Egbert Viele's survey of Manhattan shown at right are both examples of early topo maps that depict the geography and relief of the island in an artistic manner using hachures and shading. The cross-hatching shows orientation of slope, and through their density, the map maker expresses overall steepness. elevated train station at 42nd St., and an adjacent block.Ī topographical land survey shows the height, depth, size, and location of any man made or natural features on a given parcel of land, as well as the changes or contours in elevation throughout the parcel. The final example shows a typical map plate where we can see a depiction of the Library, Bryant Park, the old 6th Ave. ![]() The street index enables users to locate the map plate by address and in more recent atlases via block & lot number. used by the map makers to describe the specific features of the buildings and real property shown on the map. The key below the location map describes the meaning of the various symbols, numbers, abbreviations, color tinting, etc. ![]() (However, be sure to look for correction dates!) The location map index includes streets and physical landmarks that allow users to locate the specific plate the property is illustrated on. The title page includes the name of the borough(s) depicted as well as the year the atlas was published which may also indicate the approximate year the survey was conducted. The images at right are scans from a 1910 Manhattan Sanborn atlas found in the Digital Collections and include title page, location map index with key. Fire insurance maps, more commonly known as “ Sanborn maps” or simply “Sanborns,” are sheet or atlas maps that were designed to describe the built environment of a city and were created to allow insurance companies to assess their total liability in urbanized areas.
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