Quarter degree grid cells available for Africa
30 October 2007
This announcement has been sent to the mailing lists of "SDI-Africa", "Society of Conservation and GIS" and the "Tanzania GIS User Group".
QDGC (or QDS - Quarter degree Squares) are a way of dividing the longitude latitude degree square cells into smaller squares, forming in effect a system of geocodes. QDGC represents a way of making (almost) equal area squares covering a specific area to represent specific qualities of the area covered. The squares themselves are based on the degree squares covering the Earth.
QDGC is currently used as a geocoding system for atlases. It has been used quite a lot on the African continent as the suitability is best between +40/-40 latitude degrees of the Equator. Examples are "The atlas of southern African birds" by Harrison et al (1997), Tanzania Bird Atlas (www.tanzaniabirdatlas.com) and Tanzania Mammal Atlas (www.tanzaniamammals.org) to have mentioned some.
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