<HTML><FONT FACE=arial,helvetica><HTML><FONT COLOR="#000000" FACE="Palatino" FAMILY="SERIF" SIZE="2"><BR>
Snyder described at least three methods for creating customizable equal-area projections, as well as an equal-area projection for arbitrary polyhedral faces. I'm not aware of any of them called "ISEA".<BR>
<BR>
See:<BR>
<BR>
"Optimizing equal-area map projections using least squares", American Congress on Surveying and Mapping, Reno, ASPRS-ACSM 1987 Fall Convention, ACSM Technical Papers, p. 5-13.<BR>
<BR>
"An equal-area map projection for polyhedral globes," Cartographica, Vol. 29, No. 1, Spring 1992, pp. 10-21.<BR>
<BR>
"New equal-area map projections for noncircular regions," The American Cartographer, Vol. 15, No. 4, October 1988, pp. 341-355.<BR>
<BR>
"Minimum-error equal-area map projections," (with John A. Dyer), The American Cartographer, Vol. 16, No. 1, 1989, pp. 39-43.<BR>
<BR>
<BR>
Regards,<BR>
daan Strebe<BR>
<BR>
<BR>
In a message dated 10/18/05 09:53:13, zhangli@supermap.com writes:<BR>
<BR>
<BLOCKQUOTE CITE STYLE="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px" TYPE="CITE"></FONT><FONT COLOR="#000000" FACE="Palatino" FAMILY="SERIF" SIZE="2">Hi,<BR>
Does someone know Snyder Equal Area (ISEA) projection? Or where can I find some information about this projection ?<BR>
<BR>
Any suggestions is appreciated.<BR>
<BR>
Thanks.<BR>
<BR>
<BR>
</BLOCKQUOTE></FONT><FONT COLOR="#000000" FACE="Palatino" FAMILY="SERIF" SIZE="2"><BR>
<BR>
</FONT><FONT COLOR="#000000" FACE="Palatino" FAMILY="SERIF" SIZE="2"></FONT></HTML>