Københavns Universitet
Uafhængig af ledelsen


PhD defence: Florian Reiner

Ph.d.-forsvar — Florian Reiner - 25 Jun


Date & Time:

Aud B, Department of Geosciences and Natural Resource Management, Øster Voldgade 10, 1350 Kbh K

Hosted by:
Geography Section - IGN


Florian Reiner defends his thesis,

Assessing trees in global drylands, continental scale mapping of tree cover at individual tree level.

Associate professor Martin Brandt, IGN
Professor Rasmus Fensholt, IGN

Assessment Committee:
Associate professor Shaun Levick, CSIRO, Australia
Associate professor Martin Karlson, TEMA, Linköping University, Sweden
Associate professor Laura Vang Rasmussen (chair), IGN

Summary (shortened):
Global drylands cover 41% of the world and support more than 2 billion people. Due to low annual rainfall, drylands are characterised by sparse vegetation, with trees and shrubs Scattered across the landscape. These Trees Outside Forest play a key ecological role and provide vital ecosystem services to local communities. However, their extent, distribution and dynamics areot well understood at a global scale, as their scattered nature impedes their detection in current medium-resolution tree cover maps. There is an urgent need for an improved assessment of non-forest trees, with wide applications for conservation ecology, sustainable land management, agroforestry, and tree-based climate change mitigation. This thesis aims to develop new methods to assess dryland tree cover at single tree level and continental scale. The thesis is based on three first-authored articles. Common to all papers is an underlying approach applying state-of-the-art deep learning techniques to a new data source: 3 m resolution PlanetScope imagery. PlanetScope is a constellation of approximately 130 nanosatellites that provide daily 4-band optical imagery of the global land area, including a near-infrared band suitable for detecting vegetation.

A digital version of the PhD thesis can be obtained from the PhD secretary at phd@ign.ku.dk