s1-orbits

A Python utility for downloading Sentinel-1 Orbit files from the Registry of Open Data on AWS.

>>> import s1_orbits

>>> orbit_file = s1_orbits.fetch_for_scene('S1A_IW_SLC__1SDV_20230727T075102_20230727T075131_049606_05F70A_AE0A')
>>> orbit_file
PosixPath('S1A_OPER_AUX_POEORB_OPOD_20230816T080815_V20230726T225942_20230728T005942.EOF')

Installation

In order to easily manage dependencies, we recommend using dedicated project environments via Anaconda/Miniconda or Python virtual environments.

s1_orbits can be installed into a conda environment with:

conda install -c conda-forge s1_orbits

or into a virtual environment with:

python -m pip install s1_orbits

Usage

s1-orbits provides one function - fetch_for_scene - to download the "best available" orbit file for a given scene. This means it will download the AUX_POEORB file if it exists; otherwise, it will download the AUX_RESORB file. For a more full-featured API, see sentineleof or CDSE's APIs.

fetch_for_scene(scene: str, dir: Union[pathlib.Path, str] = '.') -> pathlib.Path
    """
    For the given scene, downloads the AUX_POEORB file if available, otherwise downloads the AUX_RESORB file.

    Args:
        scene: The scene name for which to download the orbit file.
        dir: The directory that the orbit file should download into.

    Raises:
        InvalidSceneError: Thrown if the scene name is not a proper Sentinel-1 scene name.
        OrbitNotFoundError: Thrown if an orbit cannot be found for the provided scene.

    Returns:
        download_path: The path to the downloaded file.
    """

Development

1. Install git and conda.
2. Clone the repository.

   git clone git@github.com:ASFHyP3/sentinel1-orbits-py.git
   cd sentinel1-orbits-py
   

3. Create and activate the conda environment.

   conda env create -f environment.yml
   conda activate s1-orbits
   

4. Run the tests.

   pytest tests