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Can I use a greenest pixel or a no clouds Sentinel 2 for NDVI analysis? I want to use it for extract spectral signature. And now that I´m asking about it, I want to know if I can work classification based on spectral signature in Google Earth Engine.

Note: Sorry if I have a bad redaction, my native language is note english.

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To youre first question:
Yes it is possible to derive NDVI by Sentinel-2 image.

Here are some useful links to get started with Earth Engine and Sentinel-2

  1. Description of Dataset inside GEE - Sentinel-2 MSI: MultiSpectral Instrument, Level-1C
  2. Tutorial: NDVI, Mapping a Function over a Collection, Quality Mosaicking
  3. GEE Script example for Sentinel-2 Cloud Masking
  4. Other GIS Stackexchange Questions related to GEE, Sentinel-2 and NDVI

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