MISR: In-Flight Radiometric Calibration and Characterization Plan

9.3 SOFTWARE DEVELOPMENT APPROACHThe software and procedures for reducing MISR instrument data, to provide the in-flightcalibration and characterization, are being developed as a unified system, running at the MISRSCF. The overall objective of this effort is to create a data analysis system that will:• Ensure, through appropriate data management, that the needed data sets are catalogedand accessible to the algorithm developers and data analysts;• Automate the data analysis algorithms where possible, and provide user-friendly,efficient tools needed in the production processing of large data volumes;• Provide documentation detailing the data analysis algorithms, code descriptions, andcode procedures;• Maintain the required traceability and modification history between softwareversions; and• Produce visual aids and numeric descriptors of instrument performance as needed forthe calibration and characterization reports.The software will be developed using a phased delivery and using software interface tools(e.g.: IDL) as well as standard software languages (e.g.: C, FORTRAN). This softwaredevelopment will follow standard practices (e.g.: JPL D-4000). The software implementation willbe preceded by a rapid prototyping phase to take advantage of data generated during systemtesting. Insight into the subsystem interfaces, graphical user interfaces, and data processingalgorithms resulting from the prototyping effort will be incorporated into the final calibrationsoftware design. Software documents will outline planning, requirements, software specifications,software design, and software test.Development phases will include requirements analysis, system design, prototyping/implementation, testing, documentation and maintenance.9.3.4 Requirements analysisThe requirements analysis will encompass the entire IFRCC program timeline, to ensurethat potential conflicts between short-term and long-term needs are avoided. The initial activitywill focus on:• Ensuring that the software system definition is complete and correct;• Defining the boundary for the data analysis process, including all external interfaces(e.g. defining the roles and partition of work between the IFRCC team and others,such as the ground support terminal software engineer, flight software engineer, andtest conductors in the preflight era, as well as the mission operations team postlaunch);9. Management72