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Africa 1821 (Raster Image)

Date:
2013
Description:

This layer is a georeferenced raster image of an historic paper map of Africa. This is a continental map of Africa originally created by William Channing Woodbridge in 1821. The features illustrated on this map include: rivers, lakes, and coastal islands. The central part of Africa is referred to as 'Ethiopia an unexplored region.' 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 georeferenced by the Stanford University Geospatial Center using a Sinusoidal 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 1633.33 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.

Woodbridge, William C. and Stanford Geospatial Center. (2013). Africa 1821 (Raster Image). Stanford Digital Repository. Available at: http://purl.stanford.edu/ns296gg0572.

The Oscar I. Norwich Collection consists of over 300 maps published from the 15th to the early 20th century. More information about this collection can be accessed here: http://purl.stanford.edu/qb438pg7646. For more information about Stanford's Maps of Africa Collection, see here: https://exhibits.stanford.edu/maps-of-africa/default-exhibit.

This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

Language:
English
Spatial:
(W 66°22ʹ3ʺ--E 79°40ʹ14ʺ/N 42°51ʹ29ʺ--S 38°38ʹ54ʺ)
W 66°22ʹ3ʺ--E 79°40ʹ24ʺ/N 42°51ʹ29ʺ--S 38°39ʹ9ʺ
Custom projection
EPSG::4326
Scale not given.
Africa
Temporal:
1821
Contributor:
Woodbridge, William C. (William Channing), 1794-1845
Stanford Geospatial Center
Coverage:
Stanford, California, US
Dc Rights:
This work is in the public domain. There are no restrictions on use.
CC pdm: Public Domain Mark 1.0
Edm Type:
cartographic
software
Format:
Raster Dataset
Has Type:
Geospatial data
cartographic dataset
image/tiff; format=GeoTIFF
Identifier:
edu.stanford.purl:ns296gg0572
Is Part Of:
https://purl.stanford.edu/jz110cf1395
Publisher:
Stanford Digital Repository
Subject:
Historical geography
Landforms
Bodies of water
Maps
Imagery and Base Maps
Type:
cartographic
software, multimedia
Dataset#Raster
Agg Provider:
Stanford Libraries
Agg Is Shown At:
https://purl.stanford.edu/ns296gg0572