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GSICS Wiki>Development web>AtbdCentral>AtbdMainFooBar>AtbdStp1Prc1 (29 Oct 2009, AleksandarJelenak)
1.1. Select Orbit
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1.1.1. Purpose
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We first perform a rough cut to reduce the data volume and only include relevant portions of the dataset (channels, area, time, viewing geometry). The purpose is to select portions of data collected by the two instruments that are likely to produce collocations. This is desirable because typically less then 0.1% of measurements are collocated. The processing time is reduced substantially by excluding measurements unlikely to produce collocations.Data is selected on a per-orbit or per-image basis. To do this, we need to know how often to do inter-calibration – which is based on the observed rate of change and must be defined iteratively with the results of the inter-calibration process (see 4.f).
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...Option v0.4 text... 1.1.2. General Options
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The simplest, but inefficient approach is “trial-and-error”, i.e., compare the time and location of all pairs of files within a given time window.Option v0.2 Title
A more sophisticated option is to use the observed orbital parameters (such as the Two Line Elements or TLE) with orbit prediction software such as Simplified General Perturbations Satellite Orbit Model 4 (SGP4). For instrument that has fixed or stable scan pattern such that the measurement time and location are determined by the satellite locations, this is very effective.Option v0.3 Title
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...Option v0.4 text...Available Step 1 Process 1 Level 3 Components:
Available Step 1 Process 1 Level 4 Components:
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Topic revision: r1 - 29 Oct 2009, AleksandarJelenak
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