New answers tagged remote-sensing
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This is a "real" pattern that has been noted by many workers (see below for two good examples) and attributed with the different spectral responses of ETM+ and OLI, though other factors could also play a role, e.g. LEDAPS versus LaSRC to derive surface reflectance products (if that's what you're using), whiskbroom versus pushbroom sensor.
Justin ...
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You just put what you want to do in a function that takes 1 image argument and map it over the collection. (Don't do this to the entire S2 collection; filter it down to something reasonable first):
var collection = ee.ImageCollection('COPERNICUS/S2')
var sharpened = collection.map(function(image) {
return panSharpen({
image: image,
bestEffort: ...
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Topographic effects are accounted for in Sentinel-2 L2A data, although with some approximation.
Bidirectional reflectance distribution function variations are not accounted for, because in order to perform such a correction, you need to know very well the 3D subpixel geometry of each pixel. Or you need measurements from different viewing angles at different ...
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Some updates: I used WebODM by OpenAerialMap, which worked fine. Only defining GroundControllPoints was not that straigtht forward and took some work. Results are pretty, without further adjustments
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I determined that the issue was with null values. When making the input files, the null values were set to -999, which greatly changed the values of the parameters. To solve this, I changed the valid data range in the TIMESAT settings file to -1 to 1.
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