New answers tagged satellite
Think of the geometry. The incidence angle refers to the angle from nadir, or directly beneath the satellite, which would be 0°. As the sensor looks out to the sides from this nadir, the angle of incidence increases as does the fov (field of view). This is why the resolution decreases with increase in incidence angle. This illustration from the Sentinel ...
It seems to me that many satellites are programmed to go over a certain area at the same time and in the same pass. This increase coherence between each pass's images, which facilitate operations such as change detection on the image series generated from the set of images collected from the different passes.
I got in touch with someone at the MODIS LDOPE facility and they were kind enough to help me understand why this is happening. Here is there response below: World view uses local time while mapping the observation data. Our browse uses the GMT which is the reference time used to identify granule acquisition time. Except for that beginning or ending ...
The look direction of the C-SAR instrument is right. The resolution as well as the pixel spacing depends on the product and the acquisition mode. They can range from 1.7m x 4.3 for Level 1 SLC SM to 52m by 51m for Level 1 GRD WV. ESA provides a list of all resolutions and pixel spacings for Sentinel-1 products.
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