I ran into this note on a recorded plan and I'm having trouble wrapping my head around what it's trying to tell me.
I'm thinking they are plotting features to within 1/50th of an inch on paper of where they should be. At a 50 scale, that would be +/- 1 foot.
I would say "it is what it is".
I also assume that it is a 1" = 50' scale drawing and the paper shrinks more than the accuracy.
Paul in PA
Check this out, page 92 in particular (page 6 of the pdf file):?ÿ https://www.asprs.org/wp-content/uploads/pers/1938journal/jun/1938_jun_87-93.pdf
The average human eye is capable of seeing detail to approximately 1/50th of an inch. That appears to be a coincidence here.
I would say the writer was trying to allow for end users ptinting at different scales.
Looks like a modified version of the US National Map Accuracy Standards. See this Texas Government page. It links to a USGS PDF.
For maps on publication scales larger than 1:20,000, not more than 10
percent of the points tested shall be in error by more than 1/30 inch, measured on the publication
scale; for maps on publication scales of 1:20,000 or smaller, 1/50 inch.?ÿ
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Here's some additional notes. Me thinks that this plan was a compilation of existing record plans and flown town topo data...???ÿ I'm unsure if it actually represents any field work!