Africa, and its Several Regions and Islands according to the most recent Descriptions (Raster Image)

Author(s)

Whittle, James, -1818 and Stanford Geospatial Center

Description

This layer is a georeferenced raster image of an historic continental map of Africa from 1800. Even though the map depicts extensive knowledge of the interior, the great rivers are inaccurately placed and the Nile erroneously appears to originate in two adjacent lakes in Central Africa. 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, or other information associated with the principal map. This map was scanned and georeferenced by the Stanford University Geospatial Center using a Bonne projection. This map is part of a selection of digitally scanned and georeferenced historic maps of Africa from the Oscar I. Norwich Collection at Stanford University. This historic paper map provides an historical perspective of the cultural and physical landscape during this time period. The wide range of information provided on these maps make them useful in the study of historic geography. As this map has been georeferenced, it also can be used as a background layer in conjunction with other GIS data. 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. There may also be errors introduced during the digitizing and georeferencing process. In most cases, however, errors in the raster image are small compared with sources of error in the original map graphic. The RMS error for this map is 4569.41 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. Whittle, James, and Stanford Geospatial Center. (2013). Africa, and its Several Regions and Islands according to the most recent Descriptions (Raster Image). Stanford Digital Repository. Available at: http://purl.stanford.edu/cw053qy7632. The Oscar I. Norwich Collection consists of 316 maps published from the 15th to the early 20th century. A guide to this collection can be accessed here: http://www.oac.cdlib.org/findaid/ark:/13030/kt787007h3/. More information on this collection can be accessed here mapsofafrica.stanford.edu. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

Publisher

Stanford Digital Repository

Collection

Georeferenced maps of Africa

Place(s)

Africa

Subject(s)

Historical geography, Landforms, Bodies of water, and Imagery and Base Maps

Year

1800-1880

Held by

Stanford

More details at

https://purl.stanford.edu/cw053qy7632

Use and reproduction

This work is in the public domain. There are no restrictions on use.

Copyright

This work has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

License

This work has been identified as being free of known restrictions under copyright law, including all related and neighboring rights (Public Domain Mark 1.0).