Path: utzoo!attcan!uunet!cs.utexas.edu!hellgate.utah.edu!cs.utah.edu!thomson
From: thomson@cs.utah.edu (Rich Thomson)
Newsgroups: comp.graphics
Subject: Re: map projections
Summary: USGS Professional Paper 1395 supercedes USGS Bulletin 1532
Message-ID: <1990Oct13.161628.4890@hellgate.utah.edu>
Date: 13 Oct 90 22:16:27 GMT
References: <1990Oct8.140035.28512@vicorp.com> <8750002@hpislx.HP.COM>
Organization: Oasis Technologies
Lines: 55

>   Snyder, John P., _Map_Projections_Used_by_the_U.S._Geological_
>   _Survey_, Geological Survey Bulletin 1532, 2nd ed.  Washington, D.C.:
>   U.S. Government Printing Office, 1982.

Note: the professional paper I mentioned in my previous posting on the
subject supercedes this document; Here's the preface from Professional
Paper 1395:

	``This publication is a major revision of USGS Bulletin 1532,
    which is titled _Map Projections Used by the US Geological
    Survey_.  Although several portions are essentially unchanged
    except for corrections and clarification, there is considerable
    revision in the early general discussion, and the scope of the
    book, originally limited to map projections used by the U.S.
    Geological Survey, now extends to include several other popular or
    useful projections.  These and dozens of other projections are
    described with less detail in the forthcoming USGS publication _An
    Album of Map Projections_.
	As before, this study of map projections is intended to be
    useful to both the reader interested in the philosophy or history
    of the projections and the reader desiring the mathematics.  Under
    each of the projections described, the nonmathematical phases are
    presented first, without interruption by formulas.  They are
    followed by the formulas and tables, which the first type of
    reader may skip entirely to pass to the nonmathematical section of
    the next projection.  Even with the mathematics, there are almost
    no derivations and very little calculus.  The emphasis is on
    describing the characteristics of the projection and how it is
    used.
	This professional paper, like Bulletin 1532, is also designed
    so that the user can turn directly to the desired projection,
    without reading any other section, in order to study the projection
    under consideration.  However, the list of symbols may be needed
    in any case, and the random-access feature will be enhanced by a
    general understanding of the concepts of projections and
    distortion.  As a result of this intent, there is some repetition
    which will be apparent when the book is read sequentially.
	For the more complicated projections, equations are given in
    the order of usage.  Otherwise, major equations are given first,
    followed by subordinate equations.  When an equation has been
    given previously, it is repeated with the original equation
    number, to avoid the need to leaf back and forth.  Numerical
    examples, however, are placed in appendix A.  It was felt that
    placing these with the formulas would only add to the difficulty
    of reading through the mathematical sections.
	The equations are frequently taken from other credited or
    standard sources, but a number of the equations have been derived
    or rearranged for this publication by the author.  Further
    attention has been given to computer efficiency, for example by
    encouraging the use of nested power series in place of
    multiple-angle series.
	[acknowledgments deleted]
					John P. Snyder''
Rich Thomson	thomson@cs.utah.edu  {bellcore,hplabs,uunet}!utah-cs!thomson
``If everybody is thinking the same thing, is anybody thinking?'' --Bob Johnson