In recent years, there has been an increasing number of technological devel-opments and practical applications for efficient and quantitative work analy-sis by measuring workers' flow lines. However, there may be a delay in start-ing work analysis if it is started after preparing site-specific information, such as each worker's role and typical work areas. This paper reports on a case study of work analysis using geospatial intelligence techniques with and without such site-specific information. First, this paper introduces the work site targeted in this case study, the purpose of the analysis, and the data measured and collected at the work site. Next, it describes a series of meth-ods such as indoor positioning, generation of work area transition model, clustering of work area transition instances, and exception extraction of the instances for the purpose of analyzing work patterns. A comparison of the clustering results with each worker's role and an analysis of non-routine work patterns are also reported.