Post Route Map of New York, 1871 (Image 1 of 2) (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Post route map of the state of New York : and parts of Vermont, Massachusetts, Connecticut, New Jersey and Pennsylvania, showing also the adjacent portions of the dominion of Canada, designed and constructed under the orders of Postmaster General, Alex. W. Randall, and second asst. Postmaster General, Geo. Wm. McLellan, by W.L. Nicholson, topographer of P.O. Dept. It was published by U.S. Post Office Dept. in 1868. Ink notation: "The service on this diagram brought up to date of Jan. 1st, 1871." Scale [1:380,160]. This layer is image 1 of 2 total images of the two sheet source map. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Universal Transverse Mercator (UTM) Zone 18N NAD83 projection. All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows features such as roads, railroads, postal routes (with delivery schedule frequency and distances), drainage, cities and towns, counties, and more. Includes insets: Postal service of Long Island with the principal mail connections of the city of New York. Scale [1:380,160] -- [Parts of the provinces of Québec and Ontario bordering New York and Vermont]. Includes tables of distances and statistics. This layer is part of a selection of digitally scanned and georeferenced historic maps from The Harvard Map Collection as part of the Imaging the Urban Environment project. Maps selected for this project represent major urban areas and cities of the world, at various time periods. These maps typically portray both natural and manmade features at a large scale. The selection represents a range of regions, originators, ground condition dates, scales, and purposes.

Historic paper maps can provide an excellent view of the changes that have occurred in the cultural and physical landscape. The wide range of information provided on these maps make them useful in the study of historic geography, and urban and rural land use change. As this map has been georeferenced, it can be used in a GIS as a source or background layer in conjunction with other GIS data.

source map publication date.

map.

None.

The georeferenced raster is a faithfully reproduced digital image of the original source map. Some differences may be detected between the source graphic used and the raster image due to the RGB values assigned that particular color. The intent is to recreate those colors as near as possible. Data completeness for raster digital image files reflect content of the source graphic. Features may have been eliminated or generalized on the source graphic due to scale and legibility constraints The horizontal positional accuracy of a raster image is approximately the same as the accuracy of the published source map. The lack of a greater accuracy is largely the result of the inaccuracies with the original measurements and possible distortions in the original paper map document. For instance, this map contains grid-like seams that are the result of being formerly folded as a booklet. There may also be errors introduced during the digitizing and georeferencing process. There may also be errors introduced during the digitizing and georeferencing process. In most cases, errors in the raster image are small compared with sources of error in the original map graphic. The RMS error for this map is 1510.70326 meters. This value describes how consistent the transformation is between the different control points (links). The RMS error is only an assessment of the accuracy of the transformation.

ESRI ArcCatalog 9.2.

Not applicable.