ASF Sentinel-1 Metadata Download tool

Small Python tool (asfsmd) that allows to download XML files containing Sentinel-1 products metadata from the ASF archive.

Sentinel-1 products are stored in the ASF arcive as ZIP files that are quite large because they comntain both the products annotations and the binary image data.

The asfsmd tool is able to retrieve only the relatively samll annotation files (in XML format) without downloading the entire ZIP archive.

asfsmd exploits the httpio Python package for reading HTTP resources as random-access file-like objects. In order to do it the remote server must support the Range header.

This approach allows to open the ZIP archive remotely, inspects contents, and download only the pieces of data that are actually necessary to the user.

Performnces of this approach are quite poor but, in the specific case of Sentinel-1 products, the entire process results to be faster than downloading the entire ZIP archive and extracting only annotation files.

Command Line Interface

$ python3 asfsmd.py --help

usage: asfsmd [-h] [--version]
              [--loglevel {DEBUG,INFO,WARNING,ERROR,CRITICAL}]
              [-q] [-v] [-d] [-f] [-o OUTDIR] [-u USERNAME] [-p PASSWORD]
              INPUT [INPUT ...]

ASF Sentinel-1 Metadata Download tool. Small Python tool (`asfsmd`) that
allows to download XML files containing Sentinel-1 products metadata from
the ASF archive. Sentinel-1 products are stored in the ASF arcive as ZIP
files that are quite large because they comntain both the products
annotations and the binary image data. The `asfsmd` tool is able to
retrieve only the relatively samll annotation files (in XML format) without
downloading the entire ZIP archive.

positional arguments:
  INPUT                 Sentinel-1 product name(s). If the '-f' flag is set
                        then the argument is interpreted as the filename
                        containing the list of products.

options:
  -h, --help            show this help message and exit
  --version             show program's version number and exit
  --loglevel {DEBUG,INFO,WARNING,ERROR,CRITICAL}
                        logging level (default: WARNING)
  -q, --quiet           suppress standard output messages, only errors are
                        printed to screen
  -v, --verbose         print verbose output messages
  -d, --debug           print debug messages
  -f, --file-list       read the list of products form file. The file is
                        expected to contain one product name per line.
  -o OUTDIR, --outdir OUTDIR
                        path of the output directory (default='.')
  -u USERNAME, --username USERNAME
                        username for ASF authentication. If not provided
                        the tool attempts to retireve the authentication
                        parameters for the user's '.netrc' file looking
                        for the host 'urs.earthdata.nasa.gov'
  -p PASSWORD, --password PASSWORD
                        password for ASF authentication. If not provided
                        the tool attempts to retireve the authentication
                        parameters for the user's '.netrc' file looking
                        for the host 'urs.earthdata.nasa.gov'
  --block-size BLOCK_SIZE
                        httpio block size in bytes (default: 1024)

License

The asfsmd package is distributed under the MIT License.