As an archaeologist, I do that a lot.  You will need to scan the map to create 
a .tiff. The you use the qgis georeferencing plugin to place the map in the 
correct spot.  

This should help.  Also look at the qgis documentation.  

If you overlap polygons or two rasters, play with the layer rendering and 
transparency found in the layer properties. 


> Le 10 nov. 2016 à 06:22, Pat Hin [via OSGeo.org] 
> <ml-node+s1560n5295134...@n6.nabble.com> a écrit :
> Hello guys 
> i am a private researcher who is analyzing where some former old 
> buildings has been 
> most surely been located. 
> For that of course i have sometimes just a very old map (sometimes a 
> picture or a scan). 
> How would be the best way to "overlap" this with a modern map like OSM. 
> I am sure i have to create two layers and the layer for the modern map 
> is easily to do 
> with the plugins. 
> But how to process the "old" map the best way: would do you recommend to do? 
> many thanks 
> pat 
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