Way back in February 2017 I noticed small white posts appearing around the place — as in the background of this selfie. The closeup shows more of the post. Turned out they are Geodetic Survey Marker indicator posts. Today I reported one that had come adrift.
Miraz Jordan @kitt The one whose post I reported: "Mark is a 12mm iron rod under plastic cover in gravel berm. Mark is 0.2m below ground level under plastic cover." The one in my photo: "SS pin inside iron tube under cast iron cover set in concrete 0.20m below ground level". www.geodesy.linz.govt.nz/gdb/
Miraz Jordan @kitt I believe some marks are above ground. For example we can see a Trig point from our lounge window.