Re: Question regarding GPS units

From: Thomas Fly (
Date: Mon Jun 14 2004 - 21:32:55 EDT

  • Next message: Thomas Fly: "Re: Question regarding GPS units"

    Frank Reed pointed out this link:
    which contains a link from which GTOPO30 compatible files, updated (from 1997)
    with Shuttle Radar Topography Mission (SRTM) obtained elevation data, may be
    The 1997 GTOPO30 data had indicated an elevation of 213 meters above MSL for my
    general (roughly 1 sq. km.) location, while a USGS topo map indicated about 237
    meters (for my exact location), and my 3 year-old DeLorme GPS typically averages
    about 250 meters (probably above MSL; evidently, early GPS units generally
    reported elevation above the WGS84 ellipsoid).
    The SRTM-updated DEM file gives 236 meters for my general location!
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