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Title: Africa (Raster Image)

• Cruchley, G. F.
• Stanford Geospatial Center

Dates

• Issued: 2013
• Coverage: 1841

Publishers

• Stanford Digital Repository

Summary

This layer is a georeferenced raster image of an historic paper map of Africa. This is a continental map of Africa originally created and published by G.F. Cruchley in 1841. The features illustrated on this map includes: rivers, lakes, and coastal islands. 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 held at Stanford University Libraries. 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 1679.13 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. Cruchley, G.F. and Stanford Geospatial Center. (2013) Africa (Raster Image). Stanford Digital Repository. Available at: http://purl.stanford.edu/vr426sf1153. For more information about Stanford's Maps of Africa Collection, see here: https://exhibits.stanford.edu/maps-of-africa. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

Subjects

• Africa
• Historical geography
• Landforms
• Bodies of water
• Maps
• Imagery and Base Maps
• Datasets

Geospatial coordinates

• Bounding Box: BBOX (-56.6482482, 96.9569737, 45.0914019, -41.5203472)
• Geometry: BBOX (-56.6482482, 96.9569737, 45.0914019, -41.5203472)

Provider

Stanford

Rights

• Access rights: Public

Citation

Cruchley, G. F., Stanford Geospatial Center. Africa (Raster Image). Stanford Digital Repository. Raster data. https://purl.stanford.edu/vr426sf1153

Format

GeoTIFF

Languages

• English