## Copernicus MOOC Webinar

On September 24th, 2020, in collaboration with the colleagues of the University of Luxembourg Competence Centre, we conducted the 2nd edition of Copernicus MOOC Webinar for Module 2 Accessing Copernicus data and services, with more than 250 participants.

The objective of the second module of the Copernicus MOOC is, in essence, to understand the Copernicus low level ecosystem, focusing in the following learning objectives:

• Understand how to navigate in the Copernicus “labyrinth”;
• Identify the various data types provided by Copernicus and how to access them;
• Know and be able to compare the various services you may use to access and process Copernicus data.

In the ninety-minute webinar, we presented the basics of Synthetic Aperture Radar (SAR) and SAR Interferometry (InSAR), to better understand Sentinel-1 data. The presentation was followed by a one-hour Q&A session. As we saw in the first edition of the Copernicus MOOC in Spring 2020, we were impressed by the number and the quality of the questions raised by the different participants, indicating a clear interest in the use of Copernicus radar data.

## Second Multi-Frequency GBSAR Test Campaing, Castell de Subirats, Spain

In June 22nd, 2020, we continued the field test of our new multi-frequency GBSAR system, developed in a joint effort of Balamis and the Remote Sensing Laboratory of the Universitat Politècnica de Catalunya, as the PhD of Adrià Amézaga under the aegis of the Industrial Doctorate Programs of the Generalitat de Catalunya and the Spanish Ministry of Science, Innovation and Universities.

This time, the system was fully operational and we tested its performances for forest monitoring at X-, C-, L-band frequencies and finally P-band. The test area is located right next to the Castell de Subirats (Subirats Castle), in the outskirts of the Barcelona city.

The video below shows the four 3-hour time-series of $|S_{vv}|$ images at X-, C-, L- and P-band frequencies measured this day.  One can observe how signal stability increases as the frequency gets lower. This demonstrates that vegetation is transparent at lower frequencies, mainly L- and P-band, so we are observing the soil and the rocky structures under the vegetation.