Mike and list, On Thu, Mar 10, 2022 at 5:07 AM Mike Breiding - Morgantown WV via Qgis-user <[email protected]> wrote:
> I appreciate you taking the time for writing such a detailed set of > instructions. > However, it is quicker for me to do it manually. > > If the process could be automated then of course it would be a different > matter. > I am working only with the ferns - less than a hundred records. > The flower plants are over 2500. > Perhaps others are better understanding how you want to visualize the distributions, but what I get from your description is that if you have 100 (or 2500) species then you will have 100 (or 2500) maps, which sounds unwieldy to me. This paper https://www.sciencedirect.com/science/article/pii/S1574954116300097 might have some interesting suggestions for you. Taken as a database design question, the idea of having 100 columns to record the presence or absence of each species is not elegant. A more normalized approach would be to have your geometry table (geometry of counties and unique key, perhaps county name) and a separate table with multiple rows per county, one for each species present, along with the county unique key, and then a one-to-many table join between the two. Of course this doesn't necessarily help with the business of visualizing the data... -- Chris Hermansen · clhermansen "at" gmail "dot" com C'est ma façon de parler.
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