Area-based-approach.md

+The area-based approach consists in relating plot-level field measurements with metrics derived from the point cloud extracted over those plots. The obtained models are used to map forest parameters on the whole survey area and to estimate forest statistics. The method is based on four steps :
+
+* field and ALS data preparation;
+* prediction model calibration and validation;
+* forest parameters mapping;
+* forest statistics computation.
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