Easing the extraction of hard-to-find information that is within the meta-data of Sentinel-2 imagery.
With ease you can get lost in the terminology of Sentinel-2 data, and miss the rational. Therefore, a brief overview of the satellite system is given here, so hopefully a better understanding of the jargon can be created.
The Sentinel-2 satellites are a tandem mission that orbit in a sun-synchronous orbit. Since their inclination is 98 degrees, their orbit is in North-East to South-West orientation. Recordings of the sun-lit part are counted, in the meta-data these are termed relative orbit number. This numbering system follows the orbit of the satellite system, hence when these are plotted on a map, the numbering of neighboring orbits is not incremental.
The flightpath over one orbit is called a datatake, this can the full extent of the orbit, but typically the sensor acquires only over land. Hence, recordings can be short, more specifics about the coverage can be found in the campaign archive. Furthermore, within a fight the data transfer can be subdivided towards different ground stations. In that case the datatake is subdivided into datastrips, which should have some spatial overlap.
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]
}
The main instrument onboard of Sentinel-2 is the multi-spectral imager (MSI). Which is a composition of several photo-sensitive arrays, in the along-track direction these are sensitive in different spectral ranges. While in the across-track direction these are placed in an alternating fashion, with some overlap, which looks like:
Each .
classDiagram
direction LR
Sentinel2Product "1" <|-- "1" Sentinel2Datastrip
Sentinel2Product "1" <|-- "1" Sentinel2Tile
Sentinel2Datastrip "1" -- "1..*" Sentinel2Tile
Sentinel2Tile "1" <|-- "1..*" Sentinel2Anglegrid
Sentinel2Tile "1" -- "1" bandCollection
bandCollection "1" -- "1..*" Sentinel2Band
Sentinel2Band "1" <|-- "1..*" Sentinel2Anglegrid
Sentinel2PlatformSpecs "1" -- "1..*" Sentinel2Product
Sentinel2PlatformSpecs "1" -- "1..*" Sentinel2Datastrip
Sentinel2PlatformSpecs "1" -- "1..*" Sentinel2Tile
Sentinel2PlatformSpecs "1" <|-- "1" Sentinel2GNSSSpecs
class Sentinel2Product
link Sentinel2Product "http://www.space-accountants.eu" "link towards readthedocs"
Sentinel2Product : path
Sentinel2Product : sensing_time
Sentinel2Product : spacecraft
Sentinel2Product : nanval
Sentinel2Product : satval
Sentinel2Product : rel_img_dir
Sentinel2Product : rel_ds_dir
Sentinel2Product : band_list
class Sentinel2Datastrip
Sentinel2Datastrip : path
Sentinel2Datastrip : spacecraft
Sentinel2Datastrip : datatake_id
Sentinel2Datastrip : orbit
Sentinel2Datastrip : orbit_absolute
Sentinel2Datastrip : orbit_counter
Sentinel2Datastrip : tile_list
Sentinel2Datastrip : gps_flightpath
Sentinel2Datastrip : attitudes_corrected
Sentinel2Datastrip : attitudes_raw
Sentinel2Datastrip : detector_time
Sentinel2Datastrip : sat_time
Sentinel2Datastrip : sat_ang
Sentinel2Datastrip : sat_quat
Sentinel2Datastrip : sat_str
Sentinel2Datastrip : integration_time
Sentinel2Datastrip : sampling_time
class Sentinel2Tile
Sentinel2Tile : path
Sentinel2Tile : tile_id
Sentinel2Tile : mgrs_id
Sentinel2Tile : datastrip_id
Sentinel2Tile : resolution
Sentinel2Tile : rows
Sentinel2Tile : columns
Sentinel2Tile : epsg
Sentinel2Tile : geotransforms
Sentinel2Tile : sun_azimuth_mean
Sentinel2Tile : sun_zenith_mean
class Sentinel2Anglegrid
Sentinel2Anglegrid : epsg
Sentinel2Anglegrid : unit
Sentinel2Anglegrid : geotransform
Sentinel2Anglegrid : zenith
Sentinel2Anglegrid : azimuth
Sentinel2Anglegrid : band
Sentinel2Anglegrid : detector
Sentinel2Anglegrid : rows
Sentinel2Anglegrid : columns
Sentinel2Anglegrid : depth
class bandCollection
class Sentinel2Band
Sentinel2Band : index
Sentinel2Band : epsg
Sentinel2Band : geotransform
Sentinel2Band : rows
Sentinel2Band : columns
Sentinel2Band : unit
Sentinel2Band : digitalnumbers
Sentinel2Band : detector
Sentinel2Band : zenith
Sentinel2Band : azimuth
Sentinel2Band : timing
class Sentinel2PlatformSpecs
Sentinel2PlatformSpecs : cospar_id
Sentinel2PlatformSpecs : norad_id
Sentinel2PlatformSpecs : esoc_id
Sentinel2PlatformSpecs : launch_date
Sentinel2PlatformSpecs : drag
class Sentinel2GNSSSpecs
Sentinel2GNSSSpecs : x
Sentinel2GNSSSpecs : y
Sentinel2GNSSSpecs : z
Sentinel2GNSSSpecs : orientation
style Sentinel2Datastrip fill:#AA1555,color:#fff
style Sentinel2Tile fill:#5287C6,color:#fff
Download and access the package folder using git:
git clone https://github.com/space-accountants/s2d2.git
cd s2d2The dependencies are most easily installed with conda from the conda-forge channel (see
Miniforge installers for a minimal Conda
installation). Create and activate a virtual environment with all the required dependencies:
conda env create -n s2d2 -f environment.yml
conda activate s2d2Install s2d2 using pip (add the -e option to install in development mode):
pip install .
If you want to contribute to the development of s2d2, have a look at the contribution guidelines.
This package was created with Cookiecutter and the NLeSC/python-template.