"SMOS-BOX格式转换用户指南及Sen2Cor插件使用指南"

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The (Snap用户手册)SMOS-BOX-FormatConversionUserGuide-5.8.0.pdf is a user manual for the SMOS-BOX Maintenance and Evolution NetCDF Format Conversion User Guide, version 5.8.0. The manual was prepared by Tom Block of Brockmann Consult GmbH and was last updated on 31st August 2020. The manual includes a changelog detailing the updates and changes made to the guide over time, including adaptations to the S-3 Toolbox and recommendations for Java usage. In addition to the SMOS-BOX user manual, the Sen2Cor atmospheric correction plugin for Sentinel-2 is also mentioned. This plugin is utilized for the purpose of atmospheric correction for Sentinel-2 data. The S-3 Toolbox/SMOS-BOX is a versatile tool that supports schema v7.03 data files and has undergone several updates and adaptations over the years, as reflected in the changelog of the user manual. Overall, the user manual provides comprehensive guidance on the usage of SMOS-BOX for NetCDF format conversion, with details on the version history, updates, and additional information on related tools such as Sen2Cor. The manual is a valuable resource for users seeking to understand and effectively utilize the SMOS-BOX tool for their data conversion needs.

Brockmann Consult GmbH NetCDF Format Conversion User Guide 31.08.2020

2 Motivation

This SMOS Earth Explorer to NetCDF converter software shall enable a broader range of tools to make use of the

SMOS data. Therefore, the widely supported NetCDF 4 file format has been chosen as target format.

The Earth Explorer format as being distributed by ESA is well suited for the SMOS data and for certain

architectures of processing, especially cell-by-cell Level 3 operations. Nevertheless, in other situations it is more

convenient to access the measurement variables directly than to be forced to iterate over a sequence of structures.

The converter tool performs this re-mapping of the data by flattening the structures and mapping variables to data

arrays ordered by grid-point or by snapshot.

3 Output file format

The converter output file format is NetCDF 4 with the option of writing the data in different compression levels.

3.1 Data Format

The data structure as present in the original Earth Explorer binary data files is not suited to be directly transformed

to NetCDF. The essential structure in the SMOS EEF product format is the grid point, which contains all

measurements that were acquired for that grid point by different snapshots. This original data structure can roughly

be described as a “list of structures that contains lists of structures”. Although, the format is perfectly suitable to

represent the SMOS data, it needs to be modified to match the requirements of users.

Therefore, the NetCDF file contains a serialised version of the structured data. Each grid point or snapshot data

variable is transformed into a NetCDF variable with an appropriate dimension. In the case of e.g. L1C Brightness

Temperature (BT) measurements, the structure member is translated into a two-dimensional array, one dimension

of this array is the number of grid-point measurements in the EE file, the other is the maximal number of snapshot

measurements in all grid points of the product.

All size reference variables translate into NetCDF dimensions; all structures are flattened. Array data with a

variable dimension (like e.g. Brightness Temperature data for grid points) translates into NetCDF arrays with a

fixed dimension (either set to the maximum value allowed by the data type or to the maximum value occurring in

a file).

Variable attributes in NetCDF files like scaling, units, fill values, valid ranges, flag masks, and flag meanings are

defined according to the product specifications.

3.2 Metadata

All metadata contained in the Earth Explorer file is transferred to the NetCDF file. In contrast to the XML-based

metadata in the original file, NetCDF does not allow for structured global metadata elements. Therefore, the

inherent structure is mapped to the metadata attribute names. Any metadata attribute originally contained in a

structure will be converted to a NetCDF attribute whose name is preceded by the structure name, separated by a

colon (“:”), nested structures are treated recursively, according to this rule.

Example:

The “Validity_Start” metadata-element contained in the “Validity_Period” structure nested within the

“Fixed_Header” structure is stored in the NetCDF file as a global attribute, which is denoted

"Fixed_Header:Validity_Period:Validity_Start".

3.3 Dimensions

A NetCDF file requires all dimensions being used for variables to be stored as global meta-information. The

dimension names chosen for the output file reflect the entities stored from the Earth Explorer file and are self-

explaining.

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