The GPXX format was devised for expression measurement data with space-time information collected by any sensors with GPS sensor. The GPXX format extends the GPX format, which is widely used as a GPS data exchange standard, by adding arbitrary measurement information to the space-time information expressed in the GPX format. One of the significant features of the GPXX format is that it can express information about the meaning and definition of arbitrary measurement information. Data input/output function by the GPXX format was implemented in existing software for farming data management, and the software was applied to process measured data collected by DigiFarmLogger, that was one of measurement systems for evaluation of the GPXX format. We confirmed that data processing by the GPXX format from the data conversion step to the visualization step worked well as we expected.