Delineating fragments

Delineating the boundaries of a forest fragment in a given fragmented forested landscape is actually not as straightforward as one might think. Is a ‘corridor of pixels’ linking two larger patches enough to identify them as one combined fragment (as done by Fragstats?). Where/at what point, do we split fragments into two distinct fragments.

BIOFRAG uses a new methodological approach to delineate and characterise forest patches in a given forested landscape. Thereby, we avoid problems associated with metrics generated by FRAGSTAT such as collinearity between shape metrics, biased delineation of patches, and biased estimates of patch perimeter, an important component of shape metrics.

  • Employing the Watershed Algorithm to delineate patches and create ecologically meaningful fragments
  • Describe patches using two new distinct descriptors: compactness and smoothness

Want a couple more details? Vero presented her poster at the recent Science@SAFE workshop (http://www.safeproject.net/workshop/). Lefebvre et al. 2012: Capturing Ecological Properties of Fragmented Landscapes. Novel Image Processing Based Methods.

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