9th February 2009, 03:13 PM
There is little if anything published on map regression or the computerised analysis of historic maps apart from stuff on my web site and my method statement see
http://historicenvironment.co.uk/index.php/map-analysis
for an example of its use in place names
http://historicenvironment.co.uk/index.p...placenames
for an example of conservation area analysis
http://www.historicenvironment.co.uk/dow...Amwell.pdf
I take map regression analysis to mean the analysis of maps and plans to produce some historic information such as the evolution of villages and building, the change in positions of rivers and coast or similar.
As undertaken in a dba map regression simply means a collection of photocopy of historic maps at different scales and some accompanying text describing the changes that are obvious. There are few more sophisticated examples apart from my own. A useful source of references to early examples can be found on the Britarch board a search under map regression should find it.
Maps of different date cannot be directly compared ? even OS maps because of the way they have been compiled. Early OS plans for example used a different map projection to modern OS maps so if they are directly overlaid a building will be in a slightly different place.
To correct for this digital maps are usually stretched at the corners (so that there is a continuous sheet for use in a GIS system). This makes it harder still to identify changes in for example buildings.
It is perfectly possible to correct all of these different errors however correcting the me to what is the question? Modern OS digital mapping has its errors and limitations and anybody who has tried to compare a site survey to an OS plan will know that they never fit perfectly. They cannot ? a plan at a scale of 1:100 will be very different from a plan at 1:2500.
The best place for a beginner to start are books like OS maps for the historian or Maps and Plans for the local historian and collector.
My own book is nearly complete and is due to be published later this year. I will produce a BAJR guide.
Dr Peter Wardle
http://historicenvironment.co.uk/index.php/map-analysis
for an example of its use in place names
http://historicenvironment.co.uk/index.p...placenames
for an example of conservation area analysis
http://www.historicenvironment.co.uk/dow...Amwell.pdf
I take map regression analysis to mean the analysis of maps and plans to produce some historic information such as the evolution of villages and building, the change in positions of rivers and coast or similar.
As undertaken in a dba map regression simply means a collection of photocopy of historic maps at different scales and some accompanying text describing the changes that are obvious. There are few more sophisticated examples apart from my own. A useful source of references to early examples can be found on the Britarch board a search under map regression should find it.
Maps of different date cannot be directly compared ? even OS maps because of the way they have been compiled. Early OS plans for example used a different map projection to modern OS maps so if they are directly overlaid a building will be in a slightly different place.
To correct for this digital maps are usually stretched at the corners (so that there is a continuous sheet for use in a GIS system). This makes it harder still to identify changes in for example buildings.
It is perfectly possible to correct all of these different errors however correcting the me to what is the question? Modern OS digital mapping has its errors and limitations and anybody who has tried to compare a site survey to an OS plan will know that they never fit perfectly. They cannot ? a plan at a scale of 1:100 will be very different from a plan at 1:2500.
The best place for a beginner to start are books like OS maps for the historian or Maps and Plans for the local historian and collector.
My own book is nearly complete and is due to be published later this year. I will produce a BAJR guide.
Dr Peter Wardle