Schmidt net (used for equal-area hemispherical projection) made in Mathematica 6.x; similar to Schmidtnet.png
<a href="//commons.wikimedia.org/wiki/User:Joshuardavis" title="User:Joshuardavis">Joshuardavis</a>
2007-12-09
<span class="int-own-work" lang="en">Own work</span>