Utilize Google Earth Engine to specify bands when using the ee.Image.getDownloadURL() function

I am trying to specify certain bands along with a corresponding scale argument for each band in the getDownloadURL function, but I'm having trouble getting it to function correctly.

var area = /* color: #d63000 */ee.Geometry.Polygon(
    [[[-3.1990814208984375, 10.698337865705495],
      [-3.2155609130859375, 10.50665993373459],
      [-2.63671875, 10.525563079495361],
      [-2.665557861328125, 10.714530481853876]]]);

var landsat = ee.Image(ee.ImageCollection("LANDSAT/LC08/C01/T2_TOA").first())
.clip(area)

print(landsat.getDownloadURL(
{
  'name': 'output',  
  'bands': [{id:'B1', scale:30}, {id:'B2', scale:100}]
}))
javascriptgoogle-earth-engine

Answer №1

It seems like there may be a glitch in GEE, or there could be a discrepancy between the documentation and the API. Your code appears to be correct and aligns with the documentation. However, I have never actually seen the bands argument being used in practice. This could be because getDownloadURL is considered an older method for downloading data from GEE. Despite this, I still use it in some scripts as it is simpler and does not require accounts for GDrive or GCS, although it can sometimes be unreliable.

To work around this issue, you can download each band individually at the desired scale. Here is an example script: 

print(landsat.select('B1').getDownloadURL({ scale: 30, region: region }))
print(landsat.select('B2').getDownloadURL({ scale: 100, region: region }))

If you do decide to use getDownloadURL, make sure to implement a retry algorithm to verify the downloaded zip file's validity and retry the download if necessary.

An alternative (and recommended) approach is to utilize Export: https://developers.google.com/earth-engine/exporting. For small preview images, consider using ee.Image.getThumbURL.

Answer №2

Make sure to specify the region parameter when setting up

var area = geometry.toGeoJSONString();
var route = rgbImage.getDownloadURL({'name':assetName,'format':'png','region':area,"scale": 10});

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