ISOCAM Interactive Analysis User's Manual Version 5.0 - ISO - ESA

Chapter 12
Data slicing
This chapter introduces you to CIA data preparation or data slicing (see Figure 11.1). It follows
logically from Chapter 11 and it is assumed that you have read that chapter.
12.1 Data slicing methods
As already stated in the Chapter 11 you have a choice of starting with ERD or SPD data
products and as you might expect the data preparation is different for each data product. You
may use CIA’s conversion routines to automatically create CIA data structures from either data
products or you may use the widget-based program x slicer to slice the ERD data. Both these
methods are described below in Section 12.2 and Section 12.3 respectively.
12.2 Automatic data slicing
Guidelines and examples of slicing data from different CAM observations can be found in the
following sections. In these sections you will be introduced to several new routines, the most
important of which are erdtoscd and spdtoscd – these routines are used to convert ERD data
products to ERD SCDs and SPD data products to SPD SCDs respectively. A general guide to
these routines may be found in Chapter 17. All other CIA routines used in automatic slicing are
described in Chapter 16. However, it is hoped that from the examples in the following sections
the function of these routines should be clear.
12.2.1 General slicing tips
When using the automatic slicers the following steps can be applied to data of all types of
observations.
1. Make ERD SCDs from the ERD data products with erdtoscd and then convert them to
SPD SCDs with erd2spd.
OR
Make SPD SCDs from the SPD data product with spdtoscd.
2. Save a copy of the unsliced SPD SSCD and its SPD SCDs. They can be discarded when
you are finished slicing.
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