[Qgis-user] Preferred Scale of a Polygon Shapefile?

[Tim Makins]

If a polygon shapefile has no included scale information, is there a 
QGIS tool that will assess it and determine the preferred range of 
scales that would be most suitable, or is this only done by eye? I have 
seen comments suggesting a visual comparison with features in files of 
known-scale, but hoped there might be some automatic tool.

Such a tool would assess the suitable scale for any polygon or line 
shapefile, as guidance to learn whether it can be incorporated into a 
map with other shapefiles who's scale is already known. I think this 
would be a very useful tool, and am wondering if it is already available.

Say, for instance, that I are making a map with shapefiles containing 
Medium scale data, 1:50m, from, say, Natural Earth 
(https://www.naturalearthdata.com/downloads/). I might wish to include 
another polygon shapefile, but if it is too coarse, it would look 
stupid, and if it is too fine, it would look out of place, and would be 
better simplified. The tool I am thinking of would be able to assess the 
unknown shapefile, and give a range of scales that it would be 
appropriate to use the unknown shapefile in: for instance from 1:40m to 
1:60m.


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