17th February 2009, 01:28 AM
Quote:quote:Originally posted by drpeterwardle
Just to clarify two comments.
It is perfectly possible to have 20 or more plans and maps in an urban dba- my point there is little point in duplicating infomation.
Chert said.
"When reproducing maps, try to keep them to scale, or at least to a consistent scale where possible. Think evaluation, if you know to the nearest metre where building X was, you can accurately locate your evaluation trench over it!"
Yes keep the plans to scale and mark the scale on the plan. Locating things to the nearest metre will only be done with luck given that for example OS plans are drawn to an accuracy of [u]+</u>2.5m.
Peter Wardle
If there are two completely separate surveys telling you the same thing, then it is corroboration rather than duplication. I.e. two independent witnesses saw the same thing at the same location.
I wouldn't duplicate a survey that was simply a rehash of an earlier survey.
I was thinking in particular of certain UK cities, e.g. Glasgow, that were surveyed by the OS at 1:500, which was a far more detailed and accurate survey than the present 1:1250. Where they have been tried against excavated evidence I have found them a good match. I thought I was being rather generous at a metre!
A good cop out is to go back to the sources, the original vertical aerial photographs used by the OS from c. 1944 onwards. For England these are in EH, Swindon and in Scotland the RCAHMS. For some reason Wales is different again and has its own body seemingly unrelated to Cadw or RCAHMW, I disremember its title.
I found EH happy to let me reproduce extracts from verts for DBAs. It is cheaper on the OS licensing, but heavier on ink/toner usage! Use sparingly and for impact.
For Scotland, to go with the 1st ed. 6" mapping there are the surviving Ordnance Name Books, with loads of archaeological information, most, if not all of which is duplicated in the NMRS.
Anyway, have fun Richard - DBAs are great. I'm off to do yet another one in deepest darkest Zummerzett "I am a zyder drinker... la la, la, la la, la la"