> As a newcomer to the List, from the background of being a Geodesist, > I've been wondering about the apparent precision of some List members' > declared co-ordinates and to what geodetic framework they refer. A most interesting discussion. In many cases, I suspect the answer to "which datum?" is "nary a clue." In my own case, pre-NIMA and pre-Heavens Above, I scrounged coordinates from atlases, airport and weather site databases, wherever. Few if any of those gave the datum used. - Which datum is preferred today and should be used when possible? (I'd guess WGS84.) - If the datum is unknown, what level of accuracy should be reported and used? I.e., where do the coordinates given in decimal degrees diverge in the commonly used systems? The current standard in this community seems to be four places after the decimal point, 10 meters, around GPS accuracy. Does that demand specifying the datum? ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Thu Aug 16 2001 - 12:57:34 PDT