Trig Spiders from Mars | Hacker News

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		Trig Spiders from Mars (alasdairrae.github.io)
		2 points by drsim 8 months ago \| hide \| past \| favorite \| 2 comments

lhmiles 8 months ago [–]

What are the dots?

drsim 8 months ago | [–]

Physical triangulation stations (trig points) for surveying and mapping.

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