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Estimate rare/scarce classification

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Estimate rare/scarce classification

by AndyAmphlett » Mon Mar 09, 2020 11:56 am

Tom,

Could you clarify how the 'estimate rare/scarce classification' query option works? It is under more options > attributes > estimate rare/scarce classification.

Thanks,

Andy.
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Re: Estimate rare/scarce classification

by admin » Wed Mar 25, 2020 2:59 pm

Hi Andy,

I'd forgotten what it meant. The criteria aren't sophisticated:

Based on post-1987 occurrences in a county the species must have

'Rare'
fewer than 4 distinct hectads
and fewer than 4 distinct tetrads
and fewer than 4 distinct monads

'Scarce'
fewer than 11 distinct hectads
and fewer than 11 distinct tetrads
and fewer than 11 distinct monads
Tom Humphrey
Database Officer, Botanical Society of Britain and Ireland (BSBI)
c/o Centre for Ecology and Hydrology,Maclean Building, Crowmarsh Gifford, Wallingford, Oxon, OX10 8BB, UK.
tom.humphrey@bsbi.org
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Re: Estimate rare/scarce classification

by AndyAmphlett » Wed Mar 25, 2020 5:45 pm

Tom,

Many thanks. I should have thought of that; it is the approach used in the spreadshet linked to via this Message Board post - viewtopic.php?f=1&t=155&p=1016&hilit=rpr#p1016. Having the steps of identifying taxa that match VC Rare and VC Scarce categories semi-automated, is very useful.

Andy.
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name: Andy Amphlett


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