Release notes - Sentinel Application Platform - S2TBX-5.0

Changes in S2TBX 5.0

Main features

Sentinel-2 Product Reader

Support for PSD 14 Test product

In autumn 2016 a new product format will be introduced. This new format features the following main evolutions:

The product naming (including the naming of folders and files inside the product structure) has been compacted
The products distributed on the Sentinels Data Hub will embed one single tile of the tiling grid
A full resolution True-Colour Image (TCI) will be included in every product

(http://step.esa.int/main/sentinel_2l1c_evolution2016/)

The Sentinel-2 reader is now able to support the test product (PSD 14) available at this date for both L1C and L2A levels. Other formats were implemented but could not be tested. PSD 13 products are supported as before.

New RGB Profiles

More RGB profile are available: False-color Infrared, False-color Urban, Agriculture, Atmospheric penetration, Healthy Vegetation, Land/Water, Atmospherical Removal, Shortwave Infrared, Vegetation Analysis. RGB profiles over bands of different resolution can only be seen after resampling the product.

Tile Index Band

The different tiles/granules composing the full product overlap. Some "tile_id" bands and masks has been included to indicate the granule from which each pixel is extracted.

Sentinel-2 Product Reader documentation

Overview of the instrument
Description of supported products
Description of product format
Description of some generated bands: angles, tile index

New Processors

Reflectance to Radiance Processor

The Reflectance to Radiance Processor converts the Top Of Atmosphere (TOA) reflectance to radiance from a given product. The formula implemented is:

radiance = pixelValue * cosinus(radians(incidenceAngle)) * solarIrradiance * scale / (pi * d2)

(the variables are described in the SNAP help)

For Sentinel-2 the incidence angle is replaced with the values from the sun_zenith band.

Sentinel-2 Water Processor - MCI

The Sentinel-2 MCI Processor calculates the Maximum Chlorophyll Index by exploiting the height of a measurement over a specific baseline.

L3 processor integrated via the Standalone Tools Adapter

A new Sen2Three plugin is available to call Sen2Three from the S2TBX, based on generic StandAlone Tools Adapter.

Sen2Three is a level 3 processor for the Spatio-Temporal Synthesis of bottom of atmosphere corrected Sentinel-2 level 2a images.

(http://step.esa.int/main/third-party-plugins-2/sen2three/)

Non-native API Wrapper

OTB Python API inside SNAP Operator

A example explaining how to access OTB C++ application via Python API inside a SNAP Operator Plugin has been created. The example demonstrates computing ndvi for a source product opened in SNAP through OTB

List of solved issues

Bug

[SIITBX-228] - S2-MSI reader does not load correctly the angles in some products
[SIITBX-229] - Sen2Three progress is going over 100%
[SIITBX-230] - SPOT-6 Reader test if failing
[SIITBX-236] - View synchronization between bands and index masks does not work properly in Sentinel-2 products
[SIITBX-240] - The Mosaic and SC map of Sentinel-2 level3 products are only available at one resolution
[SIITBX-241] - The cache in memory is not properly cleaned when the user closes a Sentinel-2 product
[SIITBX-243] - RGB image views do not update correctly on Mac OS X or even make OS unresponsive
[SIITBX-245] - Cloud_Coverage_Assessment not represented in SNAP

Improvement

[SIITBX-111] - Sentinel-2 Reader documentation
[SIITBX-180] - Add more RGB profiles
[SIITBX-216] - Add a band keeping track of tile ids in L1C/L2A product
[SIITBX-237] - Tile Index band : rename, group
[SIITBX-239] - Support for opening a granule without needing files from the full product.
[SIITBX-247] - Support for reading S2 products with new format (PSD14)

Requirement

[SIITBX-5] - Extension to diff. Language
[SIITBX-6] - non-native API Wrapper
[SIITBX-26] - Processor reflectance to radiance
[SIITBX-28] - Processor L3
[SIITBX-29] - Water Processor