Export raster from Google Earth Engine

Question

I wish to download the raster image of precipitation data.

Is that possible? I think I'm doing something wrong when I export it.

Here is my code:

//Rain 
var lluvia = ee.ImageCollection('JAXA/GPM_L3/GSMaP/v6/operational')
.map(function(im){return im.clip(Uy);})
.filter(ee.Filter.date('2021-01-25', '2021-02-02'));
print(lluvia.size());
var precipitation = lluvia.select('hourlyPrecipRate');
var cumPrec = precipitation.sum();
Map.addLayer(cumPrec, vislluvia, 'Lluvias');

Export.image.toDrive({image: cumPrec,
description: "Imagen",
folder: "gee_data", 
fileNamePrefix: "Imagen",
region: Uy,
scale: 30,
shardSize: 100,
fileDimensions: 5000,
fileFormat: "GeoTIFF"
 
})

Answer 1

To me it seems that the issue could be either the function .map(function(im){return im.clip(Uy);}) you are running in the ImageCollection or that the export is working fine, but you thought the result would look otherwise.

If you are using that function just to reduce the area for export, don't worry, because when you specify the region in export function, it does that automatically. For simplicity though you can have that function outside the ImageCollection like this:

function crop(image) { 
  var cropped = image.clip(Uy);
  return cropped
}

So then your ImageCollection looks like this:

//Rain 
var lluvia = ee.ImageCollection('JAXA/GPM_L3/GSMaP/v6/operational')
.filter(ee.Filter.date('2021-01-25', '2021-02-02'))
.map(crop);

The export function seems to be okey, but the dataset has a course resolution, meaning that you will have nice results only when the region is big. That is why having Uy was important for answering the question.