An index value plot uses a calculated index value instead of an absolute number. This particular graph is using a woodland index value to plot the condition indices for three sample sites within the study area over a five year period. The focus of the project is on two sites within the southwest agricultural region of Western Australia and they used remotely sensed data. On this plot an increase in the index value is associated with a decline in condition so one site is getting better, one is getting worse and one has not changed.Link to website source:
http://www.cmis.csiro.au/rsm/research/remveg/vegassess_all.html
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