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Fig.: Katja Janson

Faculty of Mathematics and Natural Sciences - Geomatics

Faculty of Mathematics and Natural Sciences | Geography Department | Geomatics | Events | June 26, Monday - Colloquium: two talks

June 26, Monday - Colloquium: two talks

When Jun 26, 2016 01:15 PM to Jun 26, 2017 02:45 PM (Europe/Berlin / UTC200) iCal
Where Room 2.108, "Uckermark"
Contact Name

Robert Dudek - Master Student, Geomatics Lab - HU Berlin

"Analyzing Greenhouse Expansion in Almeria, SE Spain"

Abstract
The Province of Almeria in SE Spain is one of the principal production sites of vegetables for the European market. What used to be a non-arable semi-desert has been converted into a hotspot of intensive agriculture within less than 50 years. The most evident feature of this land use change has been the appearance of plastic greenhouses which cover an area of more than 30.000 hectares nicknamed the 'sea of plastic' and its harsh social and ecological impacts. The aim of my master thesis is to analyze the expansion dynamics of the 'sea of plastic' using a Landsat time series consisting of 10+ time steps covering a period of more than 30 years. A spectral index is proposed on the basis of which the change detection is conducted.

 

Sam Cooper - PhD Student, Geomatics Lab - HU Berlin

"Examination of the Potential of Terrestrial Laser Scanning and Structure-from-Motion Photogrammetry for Rapid Nondestructive Field Measurement of Grass Biomass"

Abstract
Above ground biomass (AGB) is a parameter commonly used for assessment of grassland systems. Destructive AGB measurements, although accurate, are time consuming and are not easily undertaken on a repeat basis or over large areas. Structure-from-Motion (SfM) photogrammetry and Terrestrial Laser Scanning (TLS) are two technologies that have the potential to yield precise 3D structural measurements of vegetation quite rapidly. Recent advances have led to the successful application of TLS and SfM in woody biomass estimation, but application in natural grassland systems remains largely untested. The potential of these techniques for AGB estimation is examined considering 11 grass plots with a range of biomass in South Dakota, USA. Volume metrics extracted from the TLS and SfM 3D point clouds and conventional disc pasture meter settling heights were compared to destructively harvested AGB plot measurements. Although the disc pasture meter was the most rapid method, it was less effective in AGB estimation than the TLS or SfM, which both demonstrated their utility for rapid AGB estimation of grass systems. Link to publication: http://www.mdpi.com/2072-4292/9/6/531/htm