The most important point that people seem to be missing is that the Ordnance Survey maps do not have the identifying keys that match the reference column on the published pages of Griffith's Valuation. As far as I know, the only maps that have those keys are the ones available at the Valuation Office in Dublin. The only thing that is identified on the OS maps are the townlands themselves, which narrows things down, but you still have no way of knowing which "house" is the one you are trying to locate on the map. The version on the askaboutireland website gives a different number from what is in the published Griffith's. My problem is, I cannot find this point on their map. -dja

On Oct 2, 7:34 am, Dennis Ahern <[email protected]> wrote: > The most important point that people seem to be missing is that the > Ordnance Survey maps do not have the identifying keys that match the > reference column on the published pages of Griffith's Valuation. As far as > I know, the only maps that have those keys are the ones available at the > Valuation Office in Dublin. The only thing that is identified on the OS > maps are the townlands themselves, which narrows things down, but you > still have no way of knowing which "house" is the one you are trying to > locate on the map. The version on the askaboutireland website gives a > different number from what is in the published Griffith's. My problem is, > I cannot find this point on their map. > > -dja Dennis, As I pointed out in my previous post some weeks back, all the maps I examined on the askaboutireland web sites are Valuation Office maps, but they date from the 1880s, not the time of Griffith's valuation. Because of the time difference, there are many differences in landholding, renumberings, etc. so you cannot just take the Griffith's list and match to the map. However, one can match up the maps with the later ("cancelled") valuation office "rates books" from the appropriate period, these books being available on microfilm from the LDS. In fact, I used the later valuation books in part to date the maps to the 1880s, though the primary evidence in the area I was looking at was the presence of railways not constructed until the 1870s . Not that difficult to match the maps to the valuation books if you know what you are doing and are familiar with the area. The maps are numbered and marked (in red) to show all the individual landholdings within each townland - you seem to indicate that you are not seeing this? Regards, The Chief

Dennis, As "The Chief" has pointed out, the "Ask About Ireland" maps seem to date from 1880's. There are also other problems with them, e.g. map that appears may relate to an area a few miles east or west of the relevant townland, some townlands are just missing, does not have detailed town plans. However on Origins.net you can get maps, which in most cases seem to correspond directly to the reference keys in the published Valuation. They also have in some cases two or three different versions (at different dates) of the same map & the town plans. However the downside is that origins.net is subscription. Also the quality of the graphics is not quite as good as A-A-I. JM "Dennis Ahern" <[email protected]> wrote in message news:[email protected] > > The most important point that people seem to be missing is that the > Ordnance Survey maps do not have the identifying keys that match the > reference column on the published pages of Griffith's Valuation. As far as > I know, the only maps that have those keys are the ones available at the > Valuation Office in Dublin. The only thing that is identified on the OS > maps are the townlands themselves, which narrows things down, but you > still have no way of knowing which "house" is the one you are trying to > locate on the map. The version on the askaboutireland website gives a > different number from what is in the published Griffith's. My problem is, > I cannot find this point on their map. > > -dja >