CEDAR - COS Evaluation and Data ARchive

CEDAR provides "quick look" analysis for COS science data, memory dump data and diagnostic data. These tools are used during FSW development and test. Software is based on existing "ACSVU" code, and existing "FUSE Display" code. In addition to analysis, this software also provides a simple, file index or "database" of all science, memory dump, and diagnostic data produced by SITS. This file indexing is available so that the large volume of test data collected during instrument development and test can be easily sorted and cross-referenced.

CEDAR is entirely written in IDL and uses the following additional libraries:


The main interface allows the user to access all of the available tools/viewers from a simple click of a button. Access to the different data files can be obtained either via the database query tool or directly from the different viewers menus.

New entries can be added at any time to the database with the DB Entry tool. Previously added files can be found by querying the database and specifying values to look for to narrow the search and the number of matching files returned. Once a specific file is found, a data viewer can be launched directly from the DB Query.

The different viewers are specialized for the different type of data coming from COS. Not all type of data can be examined with every viewer. The Science Data viewer will display science data, either time tag, accum mode or memory data dumped as a science stream.
The Memory data viewer will display the data in hexadecimal/binary/octal or decimal format for close examination.
The Diagnostic Viewer will show the data resulting from a request for diagnostic data. The values for the monitored parameters will be tabulated in chronological order on the screen. These values can be displayed in various format in the table according to the user's preferences.

The CEDAR tool SDI_COMPARE, allows the user to compare the data from 2 different files and provide statistics and information from certain types of operations performed on the images (namely, subtraction, addition and division).

CEDAR provides a way for the user to interrupt a work session to interact and manipulate the data currently displayed by making it available from the IDL prompt. The user has full access to the data and care must be taken not to corrupt it in such a way that the session can not continue.
The user can also save the current work session in a file and restore it later to continue work from where it was left off.

CEDAR uses a number of environment variables as default values. These can be examined, modified and saved at any during during a work session. Any changes take effect as soon as they are accepted.

Lead Developer: Stéphane Béland
Last update August 2000