SentinelDownloader

Description

This transformer allows you to access the COPERNICUS Data Space Ecosystem and download Sentinel-II images right from the source.

Since the existing Sentinel-II reader targets an "Requester pays" Amazon bucket, AWS credentials are required in addition to a charge per x requests or GB.

Using the con terra SentinelDownloader transformer, you only need a free account from COPERNICUS Data Space Ecosystem to access the Sentinel-II data. Upon creating an account, you have to register an OAuth client, as desribed in here.

If you have any question or if you are looking for professional services support, please contact fme@conterra.de.

Configuration

Please ensure that you saved the workspace you're using this custom transformer in to a file before using it. The workspace uses referential paths when accessing the downloaded images.

Input Port

Initiator:

An Area Of Interest (AOI) polygon feature OR

A point feature (e.g. defined in the Creator transformer)

Coordinates must be in LL84.

Parameters/Properties

Web Connection:

- Please create an FME Web Connection of type HTTP Authentification and set it up with your credentials (id and secret). It will be used in the workspace to request an access token for the data search and download via COPERNICUS Data Space API.

MOST_RECENT [optional]:

Check if you want only the most recent image of your ingestion period

BEGIN:

Choose the start date of your ingestion period

END [optional]:

Choose the end date of your ingestion period. If not set, the recent date is choosen.

LEVEL:

Choose between the two data product levels: Level 1C (Top of atmosphere reflectances, geometric and radiometric corrected) and Level 2A (Botton of atmosphere reflectances)

CLOUDCOVER [optional]:

In this optional parameter, you can choose whether you want your results are filtered by a maximum cloud cover percentage. Keep in mind that this parameter could be the bottleneck of your search query as it possibly will exclude data if the parameter value is too small.

Output bands:

Choose between the three possible spatial resolutions (ground sampling distance) 10m, 20m, 60m, or select Download all bands.

Output Ports

The output depends on the choosen product Level and spatial resolution. For detailed information about a specific band, see this.

Level 1C:

10m

Bands 2, 3, 4, and 8.

20m

Bands 5, 6, 7, 8A, 11, and 12.

60m

Bands 1, 9, and 10

All

All 13 bands at their best posible spatial resolution (see above) and the True Color Image (TCI)

Level 2A:

10m

Bands 2, 3, 4, 8, and TCI.

20m

Bands 2, 3, 4, 5, 6, 7, 8A, 11, and 12 + TCI (all bands in 20m spatial resolution)

60m

Bands 1, 2, 3, 4, 5, 6, 7, 8A, 9, 11, and 12 + TCI (all bands in 60m spatial resolution)

All

All 12 bands at their best posible spatial resolution (see above) and the True Color Image (TCI)