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7

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 ...


4

It's normal that azimuth and range resolution of SAR sensors differ, because they depend on different variables: The azimuth resolution (AR) of a SAR system is: AR=Length_of_antenna/2 The slant range resolution (SRR) of a SAR system is: SRR=(Speed_of_light*pulse_length)/2 The ground range resolution (GRR) of a SAR system is: ...


2

Considering only one image per year is a pit-fall that you should try to avoid. One of the keys to correctly classifying different types of vegetation is the phenology, and to tap into this resource of information you should employ a multitemporal classification approach. Basically, this means that instead of using the multispectral bands and a few indicies ...


2

the original (GAO 1996) NDWI is based reflectance for the wavelength of 0.86 (NIR) and 1.24 µm (SWIR). This corresponds to bands 2 and 5 if you use MODIS. The equation for MODIS is thus (b2-b5)/(b2+b5). There are derived equation with other SWIR bands (e.g. for Landsat OLI the SWIR is around 1.6 µm), as well as NDWI2 (Mc Feeters 1996) which uses green ...


1

The "landsat-util" Python package used to support querying Landsat images based on a boundary defined by a shapefile until version 0.5.0, where it was removed to get rid of some dependencies. You could try using a version before that, e.g. v0.2.0. It's only a year old, so there is a chance it might still work. The good news is that the package's devs are ...



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