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    Re: 229 and 249
    From: Brad Morris
    Date: 2013 Jul 29, 13:36 -0400

    One possible reason is where the images are to be viewed.

    When you look at an image on a display, its typically at a fairly low resolution.  (Exceptions exist).  Extra resolution in the image does not appreciably alter how it is presented on the screen, so the detail afforded in the high resolution (and size) file is wasted.

    Therefore if either is examined on a display, no perceptible difference will be noted.

    If, however, you intend to print and view the image on paper, higher resolutions are indicated.  It is highly likely that the Celestaire image is intended to be printed.

    Brad

    On Jul 29, 2013 12:35 PM, "William Hawes" <williamhawes{at}rogers.com> wrote:

    Anyone got any idea why the Celestaire download is so large?

    The NGA (National Geospatial-Intelligence Agency) 249 Vol 1 Epoch 2010 at

    http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0012

    is 351 pages and its size is 4.97 MB.

    The Celestaire 249 Vol 1 Epoch 2015 at

    http://www.celestaire.com/Pub-249/View-category.html

    is 353 pages but is over 34 times larger at 171.29 MB.

    Quality of both documents seems to be about the same. How come the Celestaire document is so large?

    (wmh)


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