Landsat 7 on-orbit modulation transfer function estimation
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Abstract
The Landsat 7 spacecraft and its Enhanced Thematic Mapper Plus (ETM+) were launched on April 15, 1999. Pre-launch modeling of the ETM+ optical system predicted that modulation transfer function (MTF) performance would change on-orbit. A method was developed to monitor the along-scan MTF performance of the ETM+ sensor system using on-orbit data of the Lake Pontchartrain Causeway in Louisiana. ETM+ image scan lines crossing the bridge were treated as multiple measurements of the target taken at varying sampling phases. These line measurements were interleaved to construct an over-sampled target profile for each ETM+ system transfer function. Model parameters were adjusted to achieve the best fit between the simulated profiles and the image measurements. The ETM+ modulation at the Nyquist frequency and the full width at half maximum of the point spread function were computed from the best-fit system transfer function model. Trending these parameters over time revealed apparent MTF performance degradation, observed mainly in the 15-meter resolution ETM+ panchromatic band. This confirmed the pre-launch model prediction that the panchromatic band was the most sensitive to changes in ETM+ optical performance.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Landsat 7 on-orbit modulation transfer function estimation |
| DOI | 10.1117/12.450647 |
| Year Published | 2001 |
| Language | English |
| Publisher | SPIE |
| Contributing office(s) | Earth Resources Observation and Science (EROS) Center |
| Description | 12 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Conference publication |
| Larger Work Title | Proc. SPIE 4540, sensors, systems, and next-generation satellites V |
| First page | 50 |
| Last page | 61 |
| Conference Title | Sensors, Systems, and Next-Generation Satellites V |
| Conference Location | Toulouse, France |
| Conference Date | Sep 17-21, 2001 |