ABA-data-preparation.md

-This tutorial presents `R` code for the preparation of field inventory and ALS data to be used in the calibration of prediction models with the so-called area-based method. The following steps are considered :
+This tutorial presents `R` code for the preparation of field inventory and ALS data to be used in the calibration of prediction models with the so-called [area-based method](Area-based-approach). The following steps are considered :
 
 * import of field inventory data (tree measurements and plot information),
 * check of field measurements,