Collecting datasets from laborious field campaigns seems like it should be more difficult than finding and comparing data from different campaigns. Unfortunately, that often is not the case. According to Pacific Northwest National Laboratory (PNNL) Earth scientist Jinshi Jian, "Assembling datasets for comparison is difficult and time-consuming work. Units, conventions, nomenclatures—a lot of things can vary in confusing ways." Data can also be inaccessible behind paywalls or impossible to download.