The Multi-source National Forest Inventory of Finland - methods and results 2007

Abstract

This article presents the results of the Finnish multi-source forest inventory based on satellite images, digital map data and field data. The main purpose of the article is to make multi-source forest inventory results available for the foresters, and all the readers interested in forests and forest environment. The field data originates from the 10th Finnish National Forest Inventory from years 2005 to 2008 . The basic features of the employed improved k-NN, ik-NN, method are described. The results are presented by forestry centres and within forestry centres by municipalities. The estimates are given, for example, for land areas, areas of tree species dominance, age and development classes and often separately for forests available for wood supply. The mean volume and total volume estimates are given in many different ways: mean volumes by tree species and by timber assortments for forest land, poorly productive forest land and their combination and also for forests available for wood supply, as well as by age and development classes. The biomass estimates are given by tree species groups in young thinning stands in which first commercial thinning was proposed for the first 5-year-period, separately for stem and bark and branches and foliage. The biomass estimates of mature forests are presented separately for branches, foliage and stem residuals, and stumps and large roots by tree species groups. All biomass estimates are given separately for land available for wood supply. The presented results can be employed in calculating forest resource estimates also for regions larger than municipalities. The error sources for the estimates as well as the reliability of the estimates are briefly discussed in Section 3.2.3 and Chapter 5.