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" )