Trig Spiders from Marsalasdairrae.github.io 2 pointsdrsim1 year ago2 commentsSaveHideCopy link On HNComments−lhmiles1yWhat are the dots?−drsimOP1yPhysical triangulation stations (trig points) for surveying and mapping.
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What are the dots?
Physical triangulation stations (trig points) for surveying and mapping.