Automatic Detection of Onset and Cessation of Tree Stem Radius Increase using Dendrometer Data and CUSUM Charts
Mika Sulkava, Harri Mäkinen, Pekka Nöjd and Jaakko Hollmen
Proceedings of the 2nd European Symposium on Time Series Prediction (ESTSP'08)
Dendrometers are devices, which measure continuously the
stem radius of a tree. In this work, we studied the use of cumulative sum
(CUSUM) charts for automatically and, thus, objectively determining the
onset and cessation dates of radial increase based on dendrometer data.
We used data measured in two forest stands in southern Finland to demonstrate the idea and to test the performance of the CUSUM chart. In order
to produce reliable results, one has to choose suitable parameter values for
the chart. Once configured properly, the method produced results similar
to those determined by an expert.