3DSymSam is short for 3D symmetric sampling. Symmetric sampling in 2D seismic data acquisition was introduced in “Seismic Wavefield Sampling” (Vermeer, 1990) and expanded to 3D in “3-D symmetric sampling” (Vermeer, 1994). Symmetric sampling is based on a corollary of the reciprocity theorem which asserts that the wavefields in common shot gathers and in common receiver gathers have the same physical properties.
This website also contains some contributions to current and past geophysical discussions.
In October 2012 the SEG published “3D seismic survey design, second edition” by Gijs J.O. Vermeer. This edition is an extensive update of the first edition, which was published in 2002. A Chinese translation of the first edition appeared in 2008.