2.4.7 Using the Error Message File to Debug the Input Runstream File
The previous sections in this tutorial have lead through the step‑by‑step construction of a sample runstream input file for ISCST. This simple example problem illustrated the usage of the most commonly used options of the ISCST model. However, many real‑time applications of the model will be much more complex than this example, perhaps involving multiple sources and source groups, multiple receptor networks, the addition of discrete receptor locations, and/or elevated terrain heights. Since humans are prone to make errors from time to time, an effort has been made to develop improved error handling capabilities for the ISC models.
The error handling capabilities of the ISC models are designed to accomplish two things for the user. First, the model should read through the complete input file and report all occurrences of errors or suspect entries before stopping, rather than stopping on the first instance (and every instance thereafter) of an error in the input file. Second, the model should provide error and warning messages that are detailed and descriptive enough that they will help the user in his/her effort to debug the input file. The remainder of this section provides of brief introduction to the use of the model's error handling capabilities. Appendix E of this volume provides more details about the error handling provided by the ISC models, including a listing and explanation of all error and other types of messages generated by the models.
The ISC models generate messages during the processing of the input data and during the execution of model calculations. These messages inform the user about a range of possible conditions including
· Errors that will halt any further processing, except to identify additional error conditions;
· Warnings that do not halt processing but indicate a possible errors or suspect conditions; and
· Informational messages that may be of interest to the user but have no direct bearing on the validity of the results.
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