implement GEE timeseries sampling and connect to the SpectralView

[Andreas Janz]

Comparable to the GEE Timeseries Explorer QGIS plugin:

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Try to integrate this into the Spectral Profile Sources.

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Note that currently, sources are raster layer. For the GEE sampling, the data must be provided differently, by selecting a predefined or custom ee.ImageCollection.

[Andreas Janz]

Also check out the Awesome Spectral Indices for the Google Earth Engine: https://github.com/davemlz/spectral

This should make it easy to get temporal profiles of those VIs.

var dataset = "COPERNICUS/S2_SR";

var S2 = ee.ImageCollection(dataset).first()
var S2 = spectral.scale(S2,dataset);

var parameters = {
    "N": S2.select("B8"),
    "R": S2.select("B4"),
    "G": S2.select("B3"),
    "L": 0.5
};

var S2 = spectral.computeIndex(S2,["NDVI","GNDVI","SAVI"],parameters);

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