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Blomberg, Robert, 2010. Tillämpning av kNN-Sverige i Södra Skogs verksamhet : behovsinventering, databearbetning och förberedelse för praktisk implementering. Second cycle, A1E. Umeå: SLU, Dept. of Forest Resource Management

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Abstract

The digital map product kNN-Sweden contains nationwide data of the country’s forest land. The estimated forest variables are mean age, mean tree height, volume per tree species and total volume. Today Södra Skog’s assessments of timber potentials are mainly based on experience rate and subjective assumptions. Several of the company’s important functions and activities can probably be improved by a comprehensive and updated description of forest conditions in the operation area.

The purpose of this study was to investigate how data from kNN-Sweden (with reference years 2000 and 2005 respectively) relate to forest management plans created by Södra Skog per evaluated variable and area size. Another intention of the study was to identify user needs in operational activities that can be supported by data from kNN-Sweden. The study began with a survey of user needs, which was later on linked to the reports discussion by proposals for implementation options.

The results show relatively large estimation errors on the stand level. Aggregated areas, however, show substantially reduced errors. Large differences also exist between the individual variables in terms of both root mean square error and bias, expressed in per cent of true mean. These differences are similar in kNN-Sweden 2000 and 2005.

Södra Skog should be able to use data from kNN-Sweden to support a number of functions and activities. As expected, reliability of the data decreases with increased geographical resolution, therefore overviews of large areas are initially most appropriate. Evaluating map products of more operational nature i.e. higher resolution, however, indicates together with the survey study that Södra Skog can use data from kNN-Sweden also for this purpose. Practical implementation probably requires Södra Skog to summarize data in more suitable classes, definitions and layout.
These conclusions are based on assuming kNN-Sweden to be a free product requiring only low processing costs.

Main title:Tillämpning av kNN-Sverige i Södra Skogs verksamhet
Subtitle:behovsinventering, databearbetning och förberedelse för praktisk implementering
Authors:Blomberg, Robert
Supervisor:Wallerman, Jörgen
Examiner:Olsson , Håkan
Series:Arbetsrapport / Sveriges lantbruksuniversitet, Institutionen för skoglig resurshushållning
Volume/Sequential designation:273
Year of Publication:2010
Level and depth descriptor:Second cycle, A1E
Student's programme affiliation:SY001 Forest Science - Master's Programme 300 HEC
Department:(S) > Dept. of Forest Resource Management
(NL, NJ) > Dept. of Forest Resource Management
Keywords:Fjärranalys, virkespotentialer, kNN-Sverige, virkesköp, skogsbruksplan, kartering
URN:NBN:urn:nbn:se:slu:epsilon-2-332
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-2-332
Subjects:Forestry production
Surveying methods
Language:Swedish
Deposited On:15 Mar 2010 09:07
Metadata Last Modified:20 Apr 2012 14:11

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