Presentations

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Puttonen, Eetu Experiences in monitoring seasonal variation in vegetation with high density spatial and temporal terrestrial laser scanning time series Poster
Eetu Puttonen1, Paula Litkey1, Yuwei Chen1, Yunsheng Wang1, Heikki Hyyti1 and Mariana Campos1
(1) National Land Survey of Finland

Terrestrial laser scanning (TLS) has been a breakthrough technique in forest sciences over the last ten years. Ground-level laser scanning allows point cloud collection up to tens of meters in range and down to millimetre-level scale. This makes it possible to generate high-resolution target models located in distance from the scanner. Individual scans covering the scanner surroundings can be collected within minutes, but long-term – regularly repeating – monitoring campaigns are also possible. However, the operational potential of high-resolution terrestrial laser scanners is not being fully exploited in long-term vegetation monitoring.

The Finnish Geospatial Research Institute (FGI) has set up a novel TLS monitoring pilot project. The project monitors phenological changes of a fixed target site with frequent high-resolution laser scans over the whole growth season from the beginning of April to the end of October in 2019. Monitoring consists of a regular – 30-minute interval – collection of high-resolution point clouds (1 cm neighboring point difference at 100 meters) performed with a RIEGL VZ-2000i laser scanner. The time series captures detailed information on the phenological changes in the test site thus enabling clear visualization of leaf sprout in spring and their fell in autumn.

The presentation will tell about the present project status including a description on technical details, challenges in handling and processing the large datasets, and the first results. The pilot is on-going and will continue for the next few seasons. The future goal is to link the time series information with simultaneously collected biophysical references.