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    Standardizing Modulation Transfer Function (MTF) measurements is crucial for satellite imagery. A blind comparison revealed inconsistencies in slanted edge approach calculations, highlighting the need for robust methodology and implementation for accurate spatial resolution assessment.

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    Area of Science:

    • Earth Observation
    • Remote Sensing
    • Optical Sensor Calibration

    Background:

    • Spatial resolution of imaging sensors is difficult to define, often linked to Ground Sampling Distance (GSD) and Instantaneous Field of View (IFOV).
    • Modulation Transfer Function (MTF) and Signal-to-Noise Ratio (SNR) are used for geospatial quality but lack standardized calculation and consistent measurement methods.
    • The Infrared and Visible Optical Sensors (IVOS) subgroup of the Committee for Earth Observation Satellites (CEOS) Working Group on Calibration Validation (WGCV) established a team to address on-orbit MTF measurement and comparison issues.

    Purpose of the Study:

    • To address the challenge of non-standardized and difficult-to-compare Modulation Transfer Function (MTF) measurements for Earth observation sensors.
    • To conduct a blind comparison of MTF measurements using the slanted edge approach to identify discrepancies and areas for improvement.
    • To establish a reference dataset and improve the accuracy and repeatability of on-orbit MTF measurements.

    Main Methods:

    • A blind comparison of Modulation Transfer Function (MTF) measurements was conducted using the slanted edge approach.
    • A set of artificial and actual satellite edge images was developed for testing.
    • Seven organizations participated, processing the images and comparing their results, with subsequent iterations to correct errors.

    Main Results:

    • No single participant consistently produced the best MTF measurement results across all test images.
    • Accurate MTF estimates at Nyquist frequency did not guarantee accuracy at other spatial frequencies.
    • Errors in coding or methodology were identified as the cause of anomalies in initial results, requiring reprocessing and verification.

    Conclusions:

    • Accurate and repeatable Modulation Transfer Function (MTF) measurements require a thorough understanding of both methodology and implementation.
    • The study identified significant variations in MTF measurement results, emphasizing the need for standardization.
    • A reference dataset of edge images and MTF curves will be created and made accessible via the CEOS CalVal Portal to aid future measurements and validation.