136 download parallel

Downloading Earth Engine images in parallel

Uncomment the following line to install geemap if needed.

In [ ]:

# !pip install -U geemap geedim

# !pip install -U geemap geedim

In [ ]:

import ee
import geemap

import ee import geemap

Add a Landsat imagery to the map

In [ ]:

Map = geemap.Map(center=[40, -100], zoom=4)
image = ee.Image('LANDSAT/LE7_TOA_5YEAR/1999_2003').select(['B4', 'B3', 'B2'])
Map.addLayer(image, {'min': 20, 'max': 200, 'gamma': 2.0}, 'Landsat')
Map

Map = geemap.Map(center=[40, -100], zoom=4) image = ee.Image('LANDSAT/LE7_TOA_5YEAR/1999_2003').select(['B4', 'B3', 'B2']) Map.addLayer(image, {'min': 20, 'max': 200, 'gamma': 2.0}, 'Landsat') Map

Specify a region of interest.

In [ ]:

region = ee.Geometry.BBox(-112.5439, 34.0891, -85.0342, 49.6858)
Map.addLayer(region, {}, 'ROI')
Map.centerObject(region)

region = ee.Geometry.BBox(-112.5439, 34.0891, -85.0342, 49.6858) Map.addLayer(region, {}, 'ROI') Map.centerObject(region)

Create a fishnet.

In [ ]:

fishnet = geemap.fishnet(region, h_interval=4.0, v_interval=4.0, delta=0.5)

fishnet = geemap.fishnet(region, h_interval=4.0, v_interval=4.0, delta=0.5)

Add the fishnet to the map.

In [ ]:

style = {'color': 'ffff00ff', 'fillColor': '00000000'}
Map.addLayer(fishnet.style(**style), {}, 'Fishnet')

style = {'color': 'ffff00ff', 'fillColor': '00000000'} Map.addLayer(fishnet.style(**style), {}, 'Fishnet')

Download images by the fishnet cells in parallel.

In [ ]:

geemap.download_ee_image_tiles_parallel(
    image, fishnet, out_dir='tiles', scale=1000, crs='EPSG:3857')

geemap.download_ee_image_tiles_parallel( image, fishnet, out_dir='tiles', scale=1000, crs='EPSG:3857')

The parallel downloading above takes ~10 seconds. The serial downloading below takes ~60 seconds.

In [ ]:

geemap.download_ee_image_tiles(
    image, fishnet, out_dir='tiles', scale=1000, crs='EPSG:3857'
)

geemap.download_ee_image_tiles( image, fishnet, out_dir='tiles', scale=1000, crs='EPSG:3857' )