Re: Question regarding GPS units

From: Thomas Fly (tfly@alumni.caltech.edu)
Date: Mon Jun 14 2004 - 21:32:55 EDT

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

    Frank Reed pointed out this link:
    http://www.vterrain.org/Elevation/global.html
    
    which contains a link from which GTOPO30 compatible files, updated (from 1997)
    with Shuttle Radar Topography Mission (SRTM) obtained elevation data, may be
    downloaded:
    ftp://edcsgs9.cr.usgs.gov/pub/data/srtm/SRTM30/
    
    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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