QDGC - Quarter Degree Grid Cells (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. Historically QDGC has been used in a lot of African atlases. Several African biodiversity projects uses QDGC, among which The atlas of Southern African Birds[1] is the most prominent one. In 2009 a paper by Larsen et al.[2] describes the QDGC standard in detail.
^HARRISON, J.A., ALLAN, D.G., UNDERHILL, L.G., HERREMANS, M., TREE, A.J., PARKER, V. & BROWN, C.J. (1997) The atlas of southern African birds. Vols 1 and 2, BirdLife South Africa, Johannesburg, South Africa.
^Larsen, R.; Holmern, T.; Prager, S.D.; Maliti, H.; Røskaft, E. (2009). "Using the extended quarter degree grid cell system to unify mapping and sharing of biodiversity data". African Journal of Ecology. 47 (3): 382–392. doi:10.1111/j.1365-2028.2008.00997.x.
QDGC - Quarter Degree Grid Cells (or QDS - Quarter degree Squares) are a way of dividing the longitude latitude degree square cells into smaller squares...
Reptile Database "+++ the Genus Lygodactylus +++". Quarter Degree Grid Cells (QDGCs) timescale map of Lygodactylus capensis distribution in South Africa – via...
1°x1°, 0.5°x0.5°, 0.1°x0.1°, and so on. Geocode Grid (spatial index) Marsden Square C-squares QDGC Example of chart at NODC World Ocean Database 2005...
000-scale DOQQs display the same area as one 1:24,000-scale DOQ). Orthophoto QDGC "USGS GeoData Digital Orthophoto Quadrangles" (PDF). USGS Fact Sheet 057-01...
be excluded. The resolution for SABAP1 was the quarter degree grid cell (QDGC), 15 minutes of latitude by 15 minutes of longitude, 27.4 km north–south...
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