Landsat 8 (and 7) are also still operating, which take a given frame every 16 days each.
Landsat 7 unfortunately has a scan line corrector fault that means there are stripes of missing data:
There was a particularly cloud free image of Cornwall on Landsat 8 on 27th March 2017, which I show below, displayed using tuiview.
|A somewhat closer view, with Truro at the top-right, showing Falmouth, the Fal estuary, Camborne and Redruth, and Stithians Reservoir in the centre.|
|This is from 18th April 2017, with a clear view of parts of Cornwall.|
|The top image uses bands 2, 3 and 4 for the blue, green and red channels respectively, and the bottom uses 2, 8 (842nm) and 12 (2190nm).|
The reason the file size is enormous is the output from resampling has 45 bands, because although it outputs only 10 data bands, that is 2, 3, 4, 5, 6,7 ,8 , 8a, 11 and 12, there are also atmosphere optical depth, water vapour, cloud probability, snow probability, and a scene classification, and then bands describing zenith angle, solar angle for every bands. As an uncompressed GeoTIFF this was 22 gigabytes for each tile, but is less than 1GB as a KEA (and I selected only the first 15 bands using rsgislib).
|Four Sentinel 2 tiles combined (UUA, UUB, UVA, and UVB) to provide an overview of Cornwall and Devon - with border overplotted in QGIS - visible light|
|Using Band 12 = red, Band 8 = green and Band 2 = blue.|
|Sentinel 2 - 18th April 2017 - visible light|
|Sentinel 2 - 18th April 2017 - Band 12 (2.2 μm), Band 8 (842nm), and Band 2 (blue).|
|Landsat 8 - 27th March 2017 - Bands 4 3 and 2 (visible light)|
|Landsat 8 - 27th March 2017 - Bands 7, 5 and 2|
|Sentinel 2 - 26th March 2017 - visible light|
|Sentinel 2 - 26th March 2017 - Bands 12, 8, 2|
I will blog again about some of these when I have some time to experiment with processing. I have used the Sentinel 2 Toolbox and sen2cor to process the images, but I would also like to try ARCSI for processing from Level 1C to surface reflectance for Sentinel 2.