Hi Chris, many thanks for your reply. I have used the tool and it works very well. Thanks again. Azzurra
On Sat, 2 Jan 2021 at 17:19, chris hermansen <clherman...@gmail.com> wrote: > Azzurra and list, > > On Sat, Jan 2, 2021, 08:07 Azzurra Lentini <azzurralent...@gmail.com> > wrote: > >> Hi to all, >> >> I am using Qgis 3.16.1. >> >> I have a shape file of polygons of different zones classified by type of >> vegetation (so each polygon has different type of vegetation and these >> polygons have different surface). Each type of vegetation has a code >> (string type: letters and numbers), so the field of type vegetation has >> data type string (text). >> >> >> I need to understand which kind of vegetation is more frequent (which >> type of vegetation occupies a greater areal extension) and I would like to >> do a histogram that shows the result. >> > > I think you want the Vector Layer Histogram tool for this. I haven't used > it myself but from what I read it should do the job. I imagine you'll need > to add your area to the DBF. > > > https://gis.stackexchange.com/questions/352859/how-to-create-histogram-to-visualize-features-value-in-qgis-3 > > An alternative is to add the area to the DBF and import the DBF into your > favourite spreadsheet program. This would give you access to other > statistical tools. > -- Lecturer GIS University "Roma Tre" Consultant Environmental Risk Prevention and Hydrogeology AZZURRA LENTINI ++++++++++++++++++++++++++ Italy Mobile Tel.: **(39) 338 24 40 676 ++++++++++++++++++++++++++ SKYPE azzurrahydro ++++++++++++++++++++++++++ *azzurralent...@gmail.com <azzurralent...@gmail.com>* *azzurra.lent...@uniroma3.it <azzurra.lent...@uniroma3.it> * ++++++++++++++++++++++++++ *Par respect pour l'environnement,* *n'imprimez ce mail qu'en cas d'absolue nécessité*
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