For a project I want to use the view and sun angles of Sentinel-2.
While there were several discussions here in the forum before, it is still not clear to me how they relate to the other rasters.
I have seen a number of different implementations.
SNAP ignores the last row and coulmn, others simply interpolate to the raster sizes, and others are doing different interpolations.
But I haven’t found official information from ESA/Copernicus about it.
How do the 23x23 grid points relate to the 10m,20m and 60m image raster?
Does the centre point of the upper-left grid pixel correlate with the centre point of the upper-left pixel of the 10m image raster or do the upper-left corners match?
If you have some knowledge about it, I would be happy if you share it.
@Chenocq, @Jan Do you have more information about it?
Thanks
Marco from EOMasters - Mastering Earth Observation
Hey, About working with Sentinel-2 data. The 23x23 view and sun angle grid in Sentinel-2 data provides angular information at a coarser resolution than the image rasters (10m, 20m, 60m), so you’ll need to interpolate them to make it align with the pixel grids.
Different tools handle this in various ways. For instance, SNAP sometimes skips the last row and column and just interpolates from there, while other tools might use different methods. Generally, it’s assumed that the center of the upper-left grid pixel lines up with the center of the upper-left image pixel. But since ESA hasn’t given a definitive guideline, people end up using different approaches.
Here are a few methods you can use to interpolate the 23x23 view and sun angle grid to fit the higher-resolution rasters:
Marco from EOMasters - Mastering Earth Observation