Africa (Raster Image)

Description:

This layer is a georeferenced raster image of an historic continental map of Africa created by Adolf Gräf, and published by the Georgraphisches Institut in the 19th century. Due to the discoveries noted on the map, it was probably published between 1867-1881. 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 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 3067.37 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. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

Creator:

Gräf, A. (Adolf), active 1855-1878 and Stanford Geospatial Center

Publisher:

Stanford Digital Repository

Provider:

Stanford

Resource Class:

Datasets and Maps

Resource Type:

Raster data

Subject:

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

Theme:

Land cover, Imagery, and Land Cover

Temporal Coverage:

1867-1881

Date Issued:

2013

Spatial Coverage:

Africa

Rights:

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

Rights Holder:

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

License:

https://creativecommons.org/publicdomain/mark/1.0/

Access Rights:

Public

Format:

GeoTIFF

Georeferenced:

true

More details at:

https://purl.stanford.edu/cj719gj6639