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7.1 Overview

Conceptually, for a given AOT the derivation of Standard Processed Data (SPD) can be divided into three main stages:

SPD processing derives a record for each consecutive period in the sky measurement for which the power on the detector is expected to be constant:

Apart from the mean in-band power, each record contains additional information such as the power uncertainty, median value, etc. (see Section 13.3).

The above description of SPD records applies to all AOTs except AOT PHT40 (PHT-S spectro-photometry). SPD for PHT40 contains flux densities (in Jy) instead of in-band powers (in W). In the processing level following SPD (see Chapter 8) the PHT-S flux densities are converted into flux densities per wavelength interval (in ${\rm Wm^{-2}{\mu}m^{-1}}$) and surface brightness units (in ${\rm MJy\,sr^{-1}}$).

Besides the SPD products that yield the processed data for the sky measurements, a number of other products are derived based on non-sky internal measurements. The products refer to the following type of measurements (see Section 2.5):


next up previous contents index
Next: 7.2 Ramp Processing Up: 7. Data Processing Level: Previous: 7. Data Processing Level:
ISO Handbook Volume IV (PHT), Version 2.0.1, SAI/1999-069/Dc