The numbers of characters in interactive keys.  Two case studies Rogier de Kok 2006
Ideas about numbers of characters <ul><li>Watson & Dallwitz </li></ul><ul><ul><li>The Families of Flowering Plants . </li>...
<ul><li>Many collaborators from all over Australia  </li></ul><ul><li>1436 taxa </li></ul><ul><li>59 characters  </li></ul...
<ul><li>Families of the Flora Malesiana area  </li></ul><ul><ul><li>Families of Thailand & Indo-China </li></ul></ul><ul><...
Case studies <ul><li>Pea Key </li></ul><ul><ul><li>Morphology very similar </li></ul></ul><ul><ul><ul><li>Very few charact...
How many characters ? <ul><li>Number of characters in a data set mainly determine the length of the coding time </li></ul>...
Hypothetical relationship between number of characters and possible combinations (blue) Hypothetical relationship between ...
Making interactive keys <ul><li>Interactive keys are not very good a keying out taxa, but are very good at excluding possi...
 
Upcoming SlideShare
Loading in …5
×

The numbers of characters in interactive keys - Two Case Studies

1,555
-1

Published on

Presentation given by Rogier de Kok at the KikForum
Abstract:
The making of an interactive key has tree distinct phases, definition of characters and their states, character coding and the testing of the key. The character coding is the easiest and least time-consuming of the whole process, while the fist and third phases are often under estimated, both time-wise and in the complexity of the process. Two case studies are presented, the pea-key, a corroborative project dealing with a pea-flowering legumes of Australia (c. 1400 species) and the Malesian Seed Plant key a corroborative project dealing with the c. 350 families from the Flora Malesiana region.

Published in: Technology, Travel
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
1,555
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
0
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

The numbers of characters in interactive keys - Two Case Studies

  1. 1. The numbers of characters in interactive keys. Two case studies Rogier de Kok 2006
  2. 2. Ideas about numbers of characters <ul><li>Watson & Dallwitz </li></ul><ul><ul><li>The Families of Flowering Plants . </li></ul></ul><ul><ul><ul><li>As many characters as possible </li></ul></ul></ul><ul><li>Bruce Maslin </li></ul><ul><ul><li>Key to the Australian Acacia </li></ul></ul><ul><ul><ul><li>Keep number of characters to a minimum </li></ul></ul></ul>
  3. 3. <ul><li>Many collaborators from all over Australia </li></ul><ul><li>1436 taxa </li></ul><ul><li>59 characters </li></ul><ul><li>including distribution characters </li></ul>
  4. 4. <ul><li>Families of the Flora Malesiana area </li></ul><ul><ul><li>Families of Thailand & Indo-China </li></ul></ul><ul><li>Collaborators mainly from Kew & Leiden </li></ul><ul><li>344 taxa </li></ul><ul><li>64 characters </li></ul>
  5. 5. Case studies <ul><li>Pea Key </li></ul><ul><ul><li>Morphology very similar </li></ul></ul><ul><ul><ul><li>Very few characters are inappropriate for parts of the matrix </li></ul></ul></ul><ul><ul><li>Species are a small target </li></ul></ul><ul><ul><ul><li>Few combinations of characters </li></ul></ul></ul><ul><li>Family key </li></ul><ul><ul><li>Morphology not very similar </li></ul></ul><ul><ul><ul><li>Very few characters are inappropriate for parts of the matrix </li></ul></ul></ul><ul><ul><li>Families are a big target </li></ul></ul><ul><ul><ul><li>Many combinations of characters </li></ul></ul></ul>
  6. 6. How many characters ? <ul><li>Number of characters in a data set mainly determine the length of the coding time </li></ul><ul><li>Number of taxa in a data set is much less important in determining the length of the coding time </li></ul><ul><li>Relationship between the morphological characters space and the theoretical possible number of characters combinations. </li></ul>
  7. 7. Hypothetical relationship between number of characters and possible combinations (blue) Hypothetical relationship between number of characters and possible combinations in real life (purple)
  8. 8. Making interactive keys <ul><li>Interactive keys are not very good a keying out taxa, but are very good at excluding possibilities </li></ul><ul><ul><li>Make target as small as possible </li></ul></ul><ul><ul><li>Use other identification tools in combination with interactive keys </li></ul></ul>

×