de>NA</code> values can be given for <code>ie</code>, <code>rotate</code>, and <code>scale</code>, which lets
these functions find initial values for parameters that are sometimes
otherwise assumed known (e.g., <code>rotate</code> and <code>scale</code> with <code><a href="ssn_lm.html">ssn_lm()</a></code> and <code><a href="ssn_glm.html">ssn_glm()</a></code>.
Parametric forms for each spatial covariance type are presented below.</p>
<p><code>tailup_type</code> Details: Let \(D\) be a matrix of hydrologic di