Following the successful hosting of our first ever webinar, Getting Started with Sentintel–2, yesterday, we are pleased to announce that we have made a recording of the session available for anyone to watch!
If you were unable to attend the webinar or would like to watch it all again, the session can now be accessed either on our YouTube Channel or in the video gallery at the bottom of this post. The webinar covered a number of different topics in relation to the use of Sentinel–2 data, including:
- Searching for areas of interest
- Downloading Sentinel–2 data
- Using the Sentinel SNAP toolbox to view Sentinel–2 imagery
- Downloading individual Sentinel–2 bands
- Carrying out analysis of Sentinel–2 imagery in QGIS
- Using Sentinel–2 imagery for change detection purposes
During the webinar, a number of the attendees, posted questions to our facilitators specifically in relation to the webinar. We have included answers to all these questions below as reference. If you have a question which is not covered below, please do not hesitate to contact us and we will endeavour to help you out.
Webinar Questions
Q: Can you tell me the formula you used to calculate the normalised burnt ratio?
A: The formula is as follows: Band 12 – Band 8 / Band 12 + Band 8.
Q: Can you suggest any band combination for forest degradation?
A: I would say that false colour images are a very useful place to start. False colour images are composed of the near infrared band (through the red colour gun), the red band (through the green colour gun), and the green band (through the blue colour gun). If you want to try ratio images, NDVI is very good. The following link, features a table outlining possible indices and what they can be used for, including NDVI and MSI (Moisture Stress Index).
Q: Is Sentinel–2 data from Amazon delivered in granules or for the whole scene?
A: Sentinel–2 data is provided for the whole scene on Amazon S3. You can create a subset after in a GIS platform. Amazon S3 is very easy to use and the data downloads really quickly, even though each individual band is for the whole scene.
Q: Have you had any experience using Landsat images for the same purpose?
A: Yes, Landsat is useful for the same purposes and the spectral bands that are available are the same. However, they vary in order. The USGS website has further information on Landsat.
