On Thursday 31 July 2008 12:06:51 James Frysinger wrote: > I could use the advice here of someone conversant in drawing survey > plats in metric units. I am reviewing a proposed set of Subdivision > Regulations for my county and they fail to include metric equivalents, > which I will push for. > > The proposed regulations call for plats to be drawn on 18 in by 24 in or > 24 in by 36 in paper. What paper sizes are normally used in the metric > world that are roughly equivalent to that? I'm guessing at A2 and A1, > respectively. Are those commonly used in drafting of survey plats?
Here in North Carolina the law requires that plats be one of those two sizes or 21×30 (762×533.4). ISO sizes are not allowed. I haven't gotten around to asking the NCBELS to change that. Not having seen plats on ISO paper, I say go with A2 and A1, with B2 if you need one between. I suggest adding a clause specifying a year after which inch sized paper shall no longer be allowed. My original idea was that if 10% of plats are on ISO paper in some year, all plats shall be on ISO paper ten years later. > The statement on scales is that no less than 1 in = 50 ft [which would > be 1:600] be used with 1 in = 100 ft [which would be 1:1200] being the > absolute minimum. What typical metric scales should I suggest that are > roughly equivalent and do not exceed these stated values? I'm guessing > at 1 mm = 0.5 m [1:500] and 1 mm = 1 m [1:1000], respectively. The absolute minimum scale should be independent of the measuring unit used, so set it to 1:1200. If you set it to 1:1000, then it will be illegal to draw at 1 in = 100 ft. The recommended minimum may be different for foot drawings than for meter drawings. Both 1:500 and 1:1000 are typical, as is 1:200. I drew my map of the Facilities Center at 1:500. My scale (which is at the office) has 1:500, 1:1000, 1:1250, 1:1500, 1:2000, and 1:3000. This is lopsided; there's probably another one that has 1:600, 1:400, 1:750, and 1:800, or something like that. The scale should be specified as a ratio. If someone who draws in feet wants to say how many feet are drawn as an inch, let him figure it out. Pierre
