Full text of this article is only available in PDF format.

Sakari Tuominen (email), Simo Poso

Improving multi-source forest inventory by weighting auxiliary data sources

Tuominen S., Poso S. (2001). Improving multi-source forest inventory by weighting auxiliary data sources. Silva Fennica vol. 35 no. 2 article id 596. https://doi.org/10.14214/sf.596

Abstract

A two-phase sampling design has been applied to forest inventory. First, a large number of first phase sample plots were defined with a square grid in a geographic coordinate system for two study areas of about 1800 and 4500 ha. The first phase sample plots were supplied by auxiliary data of Landsat TM and IRS-1C with principal component transformation for stratification and drawing the second phase sample (field sample). Proportional allocation was used to draw the second phase sample. The number of field sample plots in the two study areas was 300 and 380. The local estimates of five continuous forest stand variables, mean diameter, mean height, age, basal area, and stem volume, were calculated for each of the first phase sample plots. This was done separately by using one auxiliary data source at a time together with the field sample information. However, if the first phase sample plot for which the stand variables were to be estimated was also a field sample plot, the information of that field sample plot was eliminated according to the cross validation principle. This was because it was then possible to calculate mean square errors of estimates related to a specific auxiliary data source. The procedure produced as many estimates for each first phase sample plot and forest stand variable as was the number of auxiliary data sources, i.e. seven estimates: These were based on Landsat TM, IRS-1C, digitized aerial photos, ocular stereoscopic interpretation from aerial photographs, data from old forest inventory made by compartments, Landsat TM95–TM89 difference image and IRS96–TM95 difference image. The final estimates were calculated as weighted averages where the weights were inversely proportional to mean square errors. The alternative estimates were calculated by applying simple rules based on knowledge and the outliers were defined. The study shows that this kind of system for finding outliers for elimination and a weighting procedure improves the accuracy of stand variable estimation.

Keywords
forest inventory; remote sensing; two-phase sampling; weighting

Author Info
  • Tuominen, Finnish Forest Research Institute, Unioninkatu 40 A, FIN-00170 Helsinki, Finland E-mail sakari.tuominen@metla.fi (email)
  • Poso, Department of Forest Resource Management, P.O. Box 27, FIN-00014 University of Helsinki, Finland E-mail sp@nn.fi

Received 6 August 1999 Accepted 24 January 2001 Published 31 December 2001

Views 4668

Available at https://doi.org/10.14214/sf.596 | Download PDF

Creative Commons License CC BY-SA 4.0

Register
Click this link to register to Silva Fennica.
Log in
If you are a registered user, log in to save your selected articles for later access.
Contents alert
Sign up to receive alerts of new content

Your selected articles
Send to email
Makkonen O., (1954) The principle of comparative time studies in for.. Acta Forestalia Fennica vol. 61 no. 14 article id 7426 (remove) | Edit comment
Ilvessalo M., Ilvessalo Y. (1966) Development of small forest holdings between 193.. Silva Fennica vol. no. 119 article id 4733 (remove) | Edit comment
Luomajoki A., (1999) Differences in the climatic adaptation of silver.. Acta Forestalia Fennica vol. 0 no. 263 article id 7523 (remove) | Edit comment
Nuutinen Y., Väätäinen K. et al. (2008) The accuracy of manually recorded time study dat.. Silva Fennica vol. 42 no. 1 article id 264 (remove) | Edit comment
Kuuluvainen T., Mäki J. et al. (2002) Tree age distributions in old-growth forest site.. Silva Fennica vol. 36 no. 1 article id 556 (remove) | Edit comment
Pietilä J., (1989) Shape of Scots pine knots close to the stem pith. Silva Fennica vol. 23 no. 4 article id 5391 (remove) | Edit comment
Vellak K., Paal J. et al. (2003) Diversity and distribution pattern of bryophytes.. Silva Fennica vol. 37 no. 1 article id 508 (remove) | Edit comment
Kangas J., Karsikko J. et al. (1993) A method for estimating the suitability function.. Silva Fennica vol. 27 no. 4 article id 5519 (remove) | Edit comment
Westman C. J., (1983) Physical and physio-chemical properties of fores.. Acta Forestalia Fennica vol. 0 no. 184 article id 7631 (remove) | Edit comment
Tuominen S., Poso S. (2001) Improving multi-source forest inventory by weigh.. Silva Fennica vol. 35 no. 2 article id 596 (remove) | Edit comment
Your search results