3. Product Format Specification (PFS)¶

3.1.1. Purpose and Scope¶

This document is produced in the context of the development of the Sentinel 2 metadata level 3 processor. Its purpose is to detail the product format specification for the metadata level 3 metadata.

3.1.2. Applicable Documents¶

Table 3-1: Applicable Documents

3.1.3. Reference Documents¶

Table 3-2: Reference Documents

3.1.4. Acronyms and Abbreviations¶

All acronyms and abbreviations are listed in [L3-GLODEF]

3.1.5. Document Structure¶

This is the third part of a set of four documents describing the Sentinel 2 metadata level 3 Processor for Spatio-Temporal synthesis, consisting of:

1. Software Installation and User’s Manual (SUM);
2. Detailed Processing Model Documentation (DPMD);
3. Product Format Specification (PFS), this document;
4. Input Output Data Definition (IODD).

The metadata level 3 PFS is an extension of the existing metadata level 2a product format. This document will only show the added or changed metadata with respect to metadata level 2a. All other specifications can be obtained from the corresponding specifications for the metadata level 1c and metadata level 2a user product as given in the list of applicable documents above. The following section details the products according to their positions in the metadata.

3.2.1. Level 3 User Product¶

Changes in the product format specification on User Product level concern the following three subtrees:

General_Info/L3_Product_Info
L3_Auxiliary_Data_Info
L3_Quality_Indicators_Info

Fig. 3.1 Level 3 User Product

3.2.2. Level 3 Product Info¶

On the metadata level 3 Product Info metadata level the following entries are added / replaced:

Table 3-3: Added / replaced entries on Product Info metadata level

All other parameter are equivalent to the L2A parent products.

Fig. 3.2 Level 3 Product Info

3.2.3. Level 3 Product Organisation¶

In the level 3 Product Organisation metadata level the list of level 2a input tiles is replaced by the corresponding level 3 output tiles:

<L3_Product_Organisation>
    <Granule_List>
      <Granules granuleIdentifier="S2A_USER_MSI_L03_TL_MTI__20150812T154929_A000534_T32UMA_N01.03"
        datastripIdentifier="S2A_USER_MSI_L03_DS_MTI__20150812T154929_S20150730T103016_N01.03"
        imageFormat="JPEG2000">
        <IMAGE_ID_3>S2A_USER_MSI_L03_TL_MTI__20150812T154929_A000534_T32UMA_B02_20m</IMAGE_ID_3>
        <IMAGE_ID_3>S2A_USER_MSI_L03_TL_MTI__20150812T154929_A000534_T32UMA_B03_20m</IMAGE_ID_3>
        ...

Fig. 3.3 Level 3 Product Organisation

3.2.4. Level 3 Auxiliary Data Info¶

In the level 3 Auxiliary Data Info metadata level the name of the L3_GIPP has been added:

<n1:L3_Auxiliary_Data_Info>
    <Aux_Data>
        <L3_GIPP_LIST>
            <GIPP_FILENAME
                type="GIP_Level-3p"
                version="1.1.0">S2A_USER_GIP_L03_TL_MTI__20150812T154929_A000534_T32UMA
            </GIPP_FILENAME>

Fig. 3.4 Level 3 Auxiliary Data Info

3.2.5. Level 3 Tile ID¶

On tile level, in the General Info metadata level TILE_ID and DATASTRIP_ID are replaced by the corresponding level 3 entries:

<n1:General_Info>
    <TILE_ID_3>S2A_USER_MSI_L03_TL_MTI__20150812T154929_A000534_T32UMA_N01.03</TILE_ID_3>
    <DATASTRIP_ID_3>S2A_USER_MSI_L03_DS_MTI__20150812T154929_S20150730T103016_N01.03</DATASTRIP_ID_3>

Fig. 3.5 Level 3 Tile ID

3.2.6. Level 3 Quality Indicators Info¶

The level 3 Quality Indicators Info metadata level has been substantially extended compared to the level 2a metadata. It consists of three substructures named as:

1. L3_Pixel_Level_QI
2. L3_Classification_QI
3. L3_Mosaic_QI

Fig. 3.6 Level 3 Quality Indicators Info

3.2.7. Level 3 Quality Indicators Info on pixel level¶

The Level 3 Quality Indicators Info on pixel level contain a list of between one and three sub entries referred by the resolution attribute, which can take the values of 10, 20 and 60. Each of the three possible sub entries contains a set of references to:

1. The level 3 preview file, located in the QI_DATA folder on GRANULE level.
2. The level 3 scene classification map, located in the QI_DATA folder on GRANULE level.
3. The level 3 mosaic map, located in the QI_DATA folder on GRANULE level.

Fig. 3.7 Level 3 Quality Indicators Info on pixel level

3.2.8. Level 3 Classification Quality Indicators¶

The metadata level 3 Classification Quality Indicators Info on pixel level contain a list of between one and three sub entries separated by the resolution attribute, which can take the values of 10, 20 and 60. Each of the three possible sub entries contains a table of statistical values for the current level 3 output product, which are:

Table 3-4: Level 3 statistics on classification level (absolute)

Table 3-5: Level 3 statistics on classification level (percentage)

Fig. 3.8 Level 3 Quality Indicators Info

3.2.9. Level 3 Quality Indicators Info on Tile Mosaic Level¶

The level 3 Quality Indicators Info on tile mosaic level contain a list of statistical information for each processed tile, separated by the resolution attribute, which can take the values of 10, 20 and 60. Each of the three possible sub entries contain a list referred by the tile number, which is the sequential number of processed tiles in temporal order.

Table 3-6: level 3 statistics on pixel level (mosaic map)

Fig. 3.9 Level 3 Quality Indicators Info on tile mosaic level