Iain, The Namibian Datum is based on the origin point, "Schwarzek" near Gobabis where: Lat = -22* 45' 35.820" South, Lon = +18* 40' 34.549" East of Greenwich. The ellipsoid of reference is the Bessel 1841, but it was implemented with the "Legal Metre." When expressed in International meters (S.I.), a = 6,377,483.865 meters b = 6,356,165.383 meters. The transformation from the Nabibian Datum to WGS84 is: dX = +616.6 meters, +/- 1.3 m., dY = +103.0 meters, +/- 1.3 m., dZ = -256.6 meters, +/- 1.3 m. (Higher order transformations exist in the literature, but are not recommended for practical use in Namibia). The Grid System used is the "Southwest Africa Belts." Math model used is the Gauss-Kruger Transverse Mercator. Central Meridians: 13*E, 15*E, 17*E, 19*E, 21*E, 23*E, and 25*E, Scale Factor @ Origin is Unity, False Northing Latitude @ Origin is -22* 00'00" South, False Easting and False Northing are zero. If you contact them at: Surveyor General, Directorate of Surveys Private Bag 13182 9000 Windhoek Republic of Namibia, >>>-----> Don't forget to write in German!!! <-----<<< For other countries, I publish monthly in "Photogrammetrc Engineering and Remote Sensing." My column is called Grids and Datums, and a number of past issues are available from the society's web site at: http://www.asprs.org/resources.html I did nearby Mozambique (Portuguese stuff) in September 1999, and Madagascar (French stuff) is available for free downloads from this month's issue (Feb 2000). Consider joining the society; it's the best journal in English that covers the entire field of GIS. Plus, it's the only one that features me! :-) Viel Gluck! -- Clifford J. Mugnier ([EMAIL PROTECTED]) Clifford J. Mugnier ([EMAIL PROTECTED]) The Topographic Engineering Laboratory Surveying, Geodesy & Photogrammetry Department of Civil Engineering Department of Civil Engineering UNIVERSITY OF NEW ORLEANS LOUISIANA STATE UNIVERSITY New Orleans, Louisiana 70148 Baton Rouge, Louisiana 70803 Voice (504) 280-7095 Voice (225) 388-8536 ------------------------------------------------------------------------ Iain Allen wrote: > > Hi Dr. Mugnier, > > I am looking for projection information for Namibia and I was told you would be a >good person to > ask. > > I have projected data for Namibia, but I have no projection information. Do you have >any idea what > projection(s) may be commonly used for Namibia. > > Thanks, > > Iain Allen ---------------------------------------------------------------------- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
MI Re: Namibia projection info
Cliff Mugnier - University of New Orleans Thu, 3 Feb 2000 14:51:55 -0800
