[Proj] Snyder ISEA
Paul B. Anderson
pbander at picusnet.com
Wed Oct 19 16:01:45 EDT 2005
- Hi All,
While I've been a list member for a couple of years, I've never posted
anything until now. This seems to be as good a time as any to let everyone
on the list know that John P. Snyder gave me a copy of his personal software
about a month before his passing. If anyone WANTS a copy, contact me off
list and I will give you the URL where you can download it. I will also send
you some operational notes. John wrote his program in MSDOS GWBasic/Quick
Basic 4.5, and what I have is fully functional. Check the 'Miscellaneous
Section' of my web site for graphics of Snyder's projections that I made
using his program:
Paul B. Anderson FCCS (USN, Retired)
Kingsport, TN native living in Norfolk, VA
----- Original Message -----
From: "Lili Zhang" <zhangli at supermap.com>
To: "PROJ.4 and general Projections D" <proj at lists.maptools.org>
Sent: Wednesday, October 19, 2005 7:57 AM
Subject: Re: Re: [Proj] Snyder ISEA
> Many thanks for your reply.
> The acronym ISEA stands for icosahedral Snyder equal area.
> I got to know ISEA at the website:
> I am doing some work on hierarchical spatial partitioning method on the
> ellipsoid suface with equal erea.
> So ,the paper An equal-area map projection for polyhedral globes maybe
> is very important for me.
> Is there any resource code that implemented Snyder's equal-area map
> projection ?
> ======= 2005-10-18 23:46:25£º=======
>>Snyder described at least three methods for creating customizable
>>projections, as well as an equal-area projection for arbitrary polyhedral
>>faces. I'm not aware of any of them called "ISEA".
>>"Optimizing equal-area map projections using least squares", American
>>Congress on Surveying and Mapping, Reno, ASPRS-ACSM 1987 Fall Convention,
>>Technical Papers, p. 5-13.
>>"An equal-area map projection for polyhedral globes," Cartographica, Vol.
>>No. 1, Spring 1992, pp. 10-21.
>>"New equal-area map projections for noncircular regions," The American
>>Cartographer, Vol. 15, No. 4, October 1988, pp. 341-355.
>>"Minimum-error equal-area map projections," (with John A. Dyer), The
>>Cartographer, Vol. 16, No. 1, 1989, pp. 39-43.
>>In a message dated 10/18/05 09:53:13, zhangli at supermap.com writes:
>>> Does someone know?Snyder Equal Area (ISEA) projection? Or where can
>>> find some information about this projection ?
>>> Any suggestions is appreciated.
>>Proj mailing list
>>Proj at lists.maptools.org
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> ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡Lili Zhang
> ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡zhangli at supermap.com
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