Exporting an image using a FeatureCollection as region in Google Earth Engine (Python)

Question

I'm trying to export an image using a FeatureCollection as region. My code is as follow:

params = {
    'description': 'ndviChange_to_gtiff',
    'scale': 30,
    'region': AOI
  }
ee.batch.Export.image.toDrive(ndviChange, **params)

the AOI is a FeatureCollection defined earlier in my code:

AOI = ee.FeatureCollection("users/..../AOI")

I'm getting this error:

TypeError: Object of type FeatureCollection is not JSON serializable

Note that I'm running the code in QGIS GEE plugin.

Answer 1

You need to use getInfo() to extract the geometry information and then provide that to the region argument.

params = {
    'description': 'ndviChange_to_gtiff',
    'scale': 30,
    'region': AOI.geometry().getInfo()['coordinates']
  }
ee.batch.Export.image.toDrive(ndviChange, **params)

This should be able to solve the issue.

Another solution that I found from this post is to use geotools package and specify the region as:

tools.geometry.getRegion(AOI)

To upload the results to drive, you also need to start the task. Following snippet starts and logs the task status every 30 seconds:

task = ee.batch.Export.image.toDrive(ndviChange, **params)
task.start()

## get the status of task while it runs every 30 sec
import time
while task.active():
    time.sleep(30)
    print(task.status())