r - How to compute (some) landscape fragmentation index -

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i working rasters of forests , need compute (some) fragmentation index.

i looking "single-value" index each raster. first try in qgis desirable plugin (lecos – land cover analytics) damaged. tried in r , in imagej can not find suitable package/plugin or function. running out of options.

can please recomend software (linux preffered)?


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