Save an EE ImageCollection in their local system
Save an EE ImageCollection in their local system
ee_imagecollection_to_local( ic, region, dsn = NULL, via = "drive", container = "rgee_backup", scale = NULL, maxPixels = 1e+09, lazy = FALSE, public = TRUE, add_metadata = TRUE, timePrefix = TRUE, quiet = FALSE, ... )
ic |
ee$ImageCollection to be saved in the system. |
region |
EE Geometry (ee$Geometry$Polygon). The
CRS needs to be the same that the |
dsn |
Character. Output filename. If missing, a temporary file will be created for each image. |
via |
Character. Method to export the image. Two methods are implemented: "drive", "gcs". See details. |
container |
Character. Name of the folder ('drive') or bucket ('gcs')
to be exported into (ignored if |
scale |
Numeric. The resolution in meters per pixel. Defaults to the native resolution of the image. |
maxPixels |
Numeric. The maximum allowed number of pixels in the exported image. The task will fail if the exported region covers more pixels in the specified projection. Defaults to 100,000,000. |
lazy |
Logical. If TRUE, a |
public |
Logical. If TRUE, a public link to the image is created. |
add_metadata |
Add metadata to the stars_proxy object. See details. |
timePrefix |
Logical. Add current date and time ( |
quiet |
Logical. Suppress info message |
... |
Extra exporting argument. See ee_image_to_drive and |
ee_imagecollection_to_local supports the download of ee$Images
by two different options: "drive"
(Google Drive) and "gcs"
(
Google Cloud Storage). In both cases, ee_imagecollection_to_local
works as follow:
1. A task is started (i.e., ee$batch$Task$start()) to
move the ee$Image from Earth Engine to the intermediate container
specified in the argument via.
2. If the argument lazy is TRUE, the task will not be
monitored. This is useful to lunch several tasks simultaneously and
calls them later using ee_utils_future_value or
future::value. At the end of this step,
the ee$Images are stored on the path specified in the argument
dsn.
3. Finally, if the argument add_metadata is TRUE, a list
with the following elements will be added to the argument dsn.
if via is "drive":
ee_id: Name of the Earth Engine task.
drive_name: Name of the Image in Google Drive.
drive_id: Id of the Image in Google Drive.
drive_download_link: Download link to the image.
if via is "gcs":
ee_id: Name of the Earth Engine task.
gcs_name: Name of the Image in Google Cloud Storage.
gcs_bucket: Name of the bucket.
gcs_fileFormat: Format of the image.
gcs_public_link: Download link to the image.
gcs_URI: gs:// link to the image.
For getting more information about exporting data from Earth Engine, take a look at the Google Earth Engine Guide - Export data.
If add_metadata is FALSE, ee_imagecollection_to_local will
return a character vector containing the filename of the images downloaded.
Otherwise, if add_metadata is TRUE, will return a list with extra information
related to the exportation (see details).
Other image download functions:
ee_as_raster(),
ee_as_stars(),
ee_as_thumbnail()
## Not run:
library(rgee)
library(raster)
ee_Initialize(drive = TRUE, gcs = TRUE)
# USDA example
loc <- ee$Geometry$Point(-99.2222, 46.7816)
collection <- ee$ImageCollection('USDA/NAIP/DOQQ')$
filterBounds(loc)$
filterDate('2008-01-01', '2020-01-01')$
filter(ee$Filter$listContains("system:band_names", "N"))
# From ImageCollection to local directory
ee_crs <- collection$first()$projection()$getInfo()$crs
geometry <- collection$first()$geometry(proj = ee_crs)$bounds()
tmp <- tempdir()
## Using drive
# one by once
ic_drive_files_1 <- ee_imagecollection_to_local(
ic = collection,
region = geometry,
scale = 250,
dsn = file.path(tmp, "drive_")
)
# all at once
ic_drive_files_2 <- ee_imagecollection_to_local(
ic = collection,
region = geometry,
scale = 250,
lazy = TRUE,
dsn = file.path(tmp, "drive_")
)
# From Google Drive to client-side
doqq_dsn <- ic_drive_files_2 %>% ee_utils_future_value()
sapply(doqq_dsn, '[[', 1)
## End(Not run)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.