Three degrees of permanency

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Some time in the past this arrow-shaped survey mark has been chiselled into the concrete kerb of Regent Street, Redfern (Sydney). It will last as long as the kerb does. But to make it more visible it has been painted blue. Eventually the paint will be weathered away. Last week there was a man surveying the boundaries of a property that adjoins the pedestrian laneway off Regent Street. So that he could see where the survey mark was through his theodolite, he had stuck a red and white post-it note next to it. The post-it note was probably gone by the next day, blown away by the wind.

I have only presumed that’s what the post-it note was for. I don’t really understand survey marks. I wish I had thought to ask the surveyor about this one. But anyway, I have contacted Scott Taylor at the Global Surveyors website and invited him to comment on this Pavement Graffiti post. According to a blog post by Scott about ‘Interesting survey marks’, surveyors like him are magnetically attracted to survey marks in kerbs, roads and bridges, and drive their friends crazy saying, “Look, there’s a level datum”. Here at Pavement Graffiti we understand this level of fanaticism.

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