Thanks for the links Ralph- and if this problem gets any more complicated, I'm going to move to Guatemala and grow bananas for a living (or stay here and go bananas). ----- Original Message ----- From: Ralph McConahy To: Thomas Fly Cc: Ed Davies Sent: Thursday, June 03, 2004 8:58 PM Subject: Re: accuracy of ISS / Venus transit track Tom, Here is a useful web site (for U.S., and some other North American, locations) that will return your geoid height given your Lat-Lon: http://www.ngs.noaa.gov/cgi-bin/GEOID_STUFF/g99sss_prompt1.prl Here is a good article: http://www.esri.com/news/arcuser/0703/geoid1of3.html Here is a more detailed article on the subject: http://www.lct.com/technical-pages/pdf/Li_G_Tut.pdf Ralph McConahy 38.3306N, 75.6970W, -25m (WGS84/ellipsoid) ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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