A workflow is defined as a software-guided navigation to problem solving. A composable workflow allows for a sequence of problem solving steps depending on the knowledge available. Several workflows to access probability density function (PDF) environmental models and power spectral density (PSD) models are provided. More information on the concept of semantic and knowledge-based workflows is available from http://www.darpa.mil/WorkArea/DownloadAsset.aspx?id=2147485441.