B.W. Brown Jr. T.D. Gilmore R. K. Mark R. C. Wilson R. O. Castle 1983 <div class=""><div class="article-section__content en main"><p>Appraisals of the two levelings that formed the southern California field test for the accumulation of the atmospheric refraction error indicate that random error and systematic error unrelated to refraction competed with the systematic refraction error and severely complicate any analysis of the test results. If the fewer than one-third of the sections that met less than second-order, class I standards are dropped, the divergence virtually disappears between the presumably more refraction contaminated long-sight-length survey and the less contaminated short-sight-length survey.</p></div></div> application/pdf 10.1029/GL010i011p01081 en American Geophysical Union An examination of the southern California field test for the systematic accumulation of the optical refraction error in geodetic leveling article