2021 > 06

Mark your calendar for 29 Nov – 1 Dec 2021 as we hope the SITES All Hands Meeting can take place in person at Sigtunahöjden!
The meeting planning has begun and in the coming months, the SITES Secretariat, along with a meeting committee made up of SITES community members, will develop and plan the meeting agenda and activities.
Detailed information about the meeting will be sent out closer to the meeting date.
We look forward to bringing the SITES community together for this event and really hope things continue to progress so we can meet in person!

RGB cameras are useful for mapping the ground in natural colors in 3-D. Multispectral cameras record images in several wavelengths, including near-infrared, and are useful for monitoring vegetation conditions. Depending on camera type and flying conditions, data need to be calibrated to provide accurate data for quantifying vegetation amount.
Per-Ola Olsson, researcher at Lund University, and collaborators have carried out an analysis of errors related to calibration, and developed a methodology for calibration that minimizes variations related to incoming light fluctuations. The analysis shows that calibration is an important step to be carried out before quantitative analyses of multispectral data from drones.
The results and useful guidelines for how to carry out the calibration were recently published in the open access journal Remote Sensing.
Reference
Olsson, P.-O., A. Vivekar, K. Adler, V. E. Garcia Millan, A. Koc, M. Alamrani & L. Eklundh (2021) Radiometric Correction of Multispectral UAS Images: Evaluating the Accuracy of the Parrot Sequoia Camera and Sunshine Sensor. Remote Sensing, 13, 577.
SITES AquaNet offers:
- openness to the scientific community
- the possibility to use natural lake communities for experiments
- the possibility to conduct and participate in modularized experiments across time and space
- high frequency sensor systems
- expert support by our technical staff and
- access to data from the accompanying monitoring programme SITES Water.
To test the infrastructure we conducted a modularized experiment along the latitudinal gradient offered by the five lakes included in SITES AquaNet. More specifically, we manipulated a press disturbance (light reduction) and a pulse disturbance (temporary presence of fish in the mesocosms). With this we could demonstrate the suitability of the infrastructure and autonomous sensor system to host modularized experiments and provide a good example of the power and advantages of such experiments.
- Read more about SITES AquaNet.
- Read more about the lakes in SITES AquaNet and SITES Water.
- Data from the experiment can be downloaded from the SITES Data Portal.
Publication (open access)
Urrutia-Cordero, P., Langvall, O., Blomkvist, P., Angeler, D., Bertilsson, S., Colom Montero, W., Eklöv, P., Aagaard Jakobsen, N., Klemedtsson, L., Laudon, H., Liljebladh, B., Lundgren, M., Parkefelt, L., Kelpsiene, E., Pierson, D., Rankinen, J., Striebel, M., Tranvik, L.J., Weslien, P., Hillebrand, H. and Langenheder, S. (2021), SITES AquaNet: An open infrastructure for mesocosm experiments with high frequency sensor monitoring across lakes. Limnol Oceanogr Methods.
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