[GRASSLIST:2400] Re: scan-resolution for maps

Geotronix mail-list at geotux.it
Thu Jan 29 11:57:21 EST 2004


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* mercoledì 28 gennaio 2004, alle 16:59, E. Koster scrive:
> Dear grass-list,
> I remember from several years ago (grass4.x) there was a document from Cerl 
> talking about resolution and accuracy of maps. This article took the 
> minimal line-width on a map, and calculated, based on the map-scale which 
> resolution was best to scan the map.
> In my files I cannot find the document I mentioned, and since I do not know 
> the title a search on the web is nearly impossible.
> Probably some of you will know what text I am refering to. Could you please 
> send me a reference, or introduce me to any other literature on this 
> subject?
> 
> the map I want to scan was created in 1639 using a copper-plate. The 
> instrument used to engrave can make lines up to a 0.1 mm in width. The 
> resolution of the map is 1:2.400. At what resolution I should scan not to 
> have an overkill of information?


I think the document you are looking for is "GRASS Tutorial: Image
processing" by Victoria Harmon and Michael Shapiro. It there that I
learnt something on the scanning resolutions.

Bye
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