Discussion

Abstract

The differences of the old k-NN method and the current ik-NN method are summarised. The ik-NN technique is the core of the current Finnish multi-source forest inventory. The most common applications of the output results together with the data users of the Finnish multi-source forest inventory are discussed. The limitations and several error sources of the satellite image-aided estimation and prediction methods are outlined. Some of these error sources and limitations are also valid for the other satellite image based methods and applications. The MS-NFI method, compared to commonly employed satellite image methods, can be regarded as a small-area estimation method that adds to the usual pixel-level prediction method. The small-area estimates are applicable regardless of the relatively high pixel-level errors.