Henrik Persson defended his PhD dissertation 12 December

Henrik Persson successfully defended his doctoral dissertation titled ”Estimation of forest parameters using 3D satellite data – Stereogrammetry, radargrammetry and interferometry” on the 12th of December. His opponent was Professor Svein Solberg, from the Norsk institutt for skog og landskap. Henrik’s thesis focused on using different types of three-dimensional (3D) satellite data sources to accurately estimate forest variables, primarily above-ground biomass (AGB) and tree height (H), using stereogrammetry, radargrammetry and interferometry.

His studies (performed primarily in two test sites in Sweden) showed that optical stereogrammetric models can play a role in estimating variables for boreal forest, but to obtain accurate estimations rather high resolution, along-track data with pixel sizes smaller than 10 m were required. Radargrammetry performed with TerraSAR X data gave RMSEs for AGB and H of 22.9% and 7.7%, respectively, at stand-level. Interferometry was applied to data from the TanDEM-X mission and this technique was superior to stereogrammetric and radargrammetric techniques, where AGB and H could be estimated with 14.4% and 4.1% RMSE, respectively, at stand-level.

Here is a link to SLU’s news (in Swedish): http://www.slu.se/sv/om-slu/fristaende-sidor/aktuellt/alla-nyheter/2014/12/allt-sakrare-skattningar-av-skogsbiomassa-med-3d-satellitdata/

And a link to Henrik’s thesis on Epsilon: http://pub.epsilon.slu.se/11658/

Congratulations Dr. Persson!