On linear-angular intersection and its application in topographic survey .
边角交会法及其在地形测量中的应用。
This implies that mercury underwent some major topographic changes after it formed - perhaps through tectonic forces .
这说明了水星在火山口形成后又发生了一些巨大的地质变化，或许是其构造带来的推动力。
Upon acceptance , the contractor shall submit two digital copies in autocad or equivalent approved one full-size original copy and six printed copies of the relevant as-built drawings , bathymetric and topographic surveys to the engineer .
