How can I save an image in GEOTIFF format?

Question

I'm having some trouble for a project work. I have to calculate NDVI for a specific area of the Apulia region, South Italy, using images from Sentinel 2 satellite and Python language.

In order to accomplish the task, I thought of dividing the workflow in these steps:

create a ROI
take the image collection from the satellite
export the collection into the RGB bands (B4, B3, B2) in GEOTIFF format
export the collection into the NIR band (B8) in GEOTIFF format
use the SNAP tool to calculate the NDVI

First of all, my first problem is that I must insert my ROI (Geometry.Polygon) inline, otherwise I will have a completely blank image. How could I resolve this and have a variable "roi" so I can use the filterBounds command? (The code is shown below)

Then, how could I export the image as said before?

ee.mapclient.centerMap(15.7151226, 41.5049459, 11)
collection = (ee.ImageCollection('COPERNICUS/S2') 
          .filter(ee.Filter.lt("CLOUDY_PIXEL_PERCENTAGE", 10)) 
          .filterDate('2018-05-01', '2018-10-30')
          .filterBounds(ee.Geometry.Polygon([
              [15.031742, 41.736782], [16.152907, 41.736782], 
              [15.031742, 41.321053], [16.152907, 41.321053]]))
          )

How can I save an image in GEOTIFF format?

0 Answers0