Overview
ISO 18381:2013 - Space data and information transfer systems - Lossless multispectral and hyperspectral image compression - defines a lossless compression algorithm and compressed data format for digital three-dimensional image data from spaceborne payload instruments (for example, multispectral and hyperspectral imagers). The standard targets reduction of data volume to lower transmission channel bandwidth, buffering and storage requirements, and data-transmission time, while ensuring no distortion is introduced by compression/decompression (strictly lossless).
ISO 18381:2013 adopts CCSDS 123.0-B-1 (May 2012) as the normative technical specification and is intended to support multi-mission interoperability across space agencies and ground systems.
Key Topics and Requirements
- Scope: Applies only to lossless compression of three-dimensional image data (spatial × spectral dimensions).
- Algorithm & Format: Specifies the compression method and the structure of the compressed image (headers, body, and metadata) to enable consistent encoders and decoders.
- Predictor-based approach: The standard includes predictive coding concepts (prediction neighborhoods, local sums/differences, weight updates, mapped residuals) to model multispectral/hyperspectral data correlations.
- Encoder structure: Defines header formats, body organization, and how compressed samples are stored for reliable transmission and storage.
- Performance notes: ISO 18381:2013 does not prescribe encoder/decoder hardware designs, nor does it quantify expected bandwidth reduction or compare alternative approaches - it standardizes the method and format for interoperability.
- Interoperability focus: Minimal instrument-specific constraints are provided to ensure multi-mission support.
Practical Applications
- Satellite payload data compression for Earth observation missions (multispectral and hyperspectral imagers).
- Onboard spacecraft data reduction to save downlink bandwidth and onboard storage.
- Ground-segment decompression and archive systems used by space agencies and remote sensing data providers.
- Preprocessing in remote sensing analytics pipelines where original radiometric fidelity must be preserved (scientific, environmental monitoring, mineralogy, agriculture).
Who Should Use This Standard
- Spacecraft instrument designers and payload engineers implementing onboard compressors.
- Mission system architects and ground-segment developers handling telemetry, data storage and distribution.
- Software developers building lossless compression/decompression tools for multispectral/hyperspectral data.
- Standards and interoperability teams across space agencies (e.g., NASA, ESA, JAXA) and commercial EO providers.
Related Standards
- CCSDS 123.0-B-1 (Lossless Multispectral & Hyperspectral Image Compression) - normative basis for ISO 18381:2013.
- References and cross-referenced ISO/CCSDS documents (e.g., image data and transfer standards) are cited within ISO 18381 to support implementation and interoperability.
Keywords: ISO 18381:2013, lossless compression, multispectral, hyperspectral, image compression, space data, CCSDS, payload instruments, compressed data format, three-dimensional image data.