keeshu@nikhefk.UUCP (Kees Huyser) (09/22/89)
Bug in Map Cdev --------------- The Map Cdev as delivered in System 6.0.x has a bug in the distance calculation. To see the bug do the following: Find Amsterdam and Set as the default location. You will see that the distance form Amsterdam to Amsterdam is 0 Miles. Now click on the word 'mi' and see the word change to 'km'. The distance is now 10 kilometers... Click on the word 'km' and see it change to 'dg'. The great circle distance in degrees is now 360.[I think it ought to be 0 (zero) degrees, but 360 will do me fine] This 'click on mi/km/dg words' is not documented in the Macintosh Utilities User's Guide, but I think the bug is worth reporting. This bug is not in every location in the Map database, some locations will give you zero miles and zero kilometers. A real fun location to try out is Denver: it is 10 miles/10 kilometers from Denver... The same holds for Salt Lake City. Another strange phenomena is in the degrees display: Cities on the northern half of the globe are 360 degrees from themselves, cities in the southern hemisphere are 180 degrees from themselves. Anybody care to comment? --kees
mls@cbnewsm.ATT.COM (michael.l.siemon) (09/23/89)
In article <581@nikhefk.UUCP>, keeshu@nikhefk.UUCP (Kees Huyser) writes: > Another strange phenomena is in the degrees display: > Cities on the northern half of the globe are 360 degrees from > themselves, cities in the southern hemisphere are 180 degrees > from themselves. Good grief! this is exactly what Bret Trolley-for-a-brain has been claiming -- that the earth has a non-orientable surface! -- Michael L. Siemon I cannot grow; cucard!dasys1!mls I have no shadow att!sfbat!mls To run away from, standard disclaimer I only play.
joe@gistdev.UUCP (Joe Brownlee) (09/26/89)
In article <581@nikhefk.UUCP> keeshu@nikhefk.UUCP (Kees Huyser) writes: >The Map Cdev as delivered in System 6.0.x has a bug in >the distance calculation. [...] > > This bug is not in every location in the Map database, some locations > will give you zero miles and zero kilometers. A real fun location > to try out is Denver: it is 10 miles/10 kilometers from Denver... > The same holds for Salt Lake City. [...] > >Anybody care to comment? > >--kees I entered my home town of Champaign, Illinois by exact Lat/Long from an atlas and -- guess what -- Champaign is 10 mi. from Champaign, too. I tried a bunch of things to change this with no luck. I know Einstein said the universe is curved, but this is somewhat extreme... Joe Brownlee | Captain, please -- not in front of the Klingons. GIST, Inc. | -- Mr. Spock, Star Trek V 1800 Woodfield Dr. | Pay attention to what I say, and you might start a trend. Savoy, IL 61874 | ARPANET: joe%gistdev@uxc.cso.uiuc.edu (217) 352-1165 | UUCP : {uunet,pur-ee,convex}!gistdev!joe