Validating Safecast data by comparisons to a U. S. Department of Energy Fukushima Prefecture aerial survey.
Safecast is a volunteered geographic information (VGI) project where the lay public uses hand-held sensors to collect radiation measurements that are then made freely available under the Creative Commons CC0 license. However, Safecast data fidelity is uncertain given the sensor kits are hand assembled with various levels of technical proficiency, and the sensors may not be properly deployed. Our objective was to validate Safecast data by comparing Safecast data with authoritative data collected by the U. S. Department of Energy (DOE) and the U. S. National Nuclear Security Administration (NNSA) gathered in the Fukushima Prefecture shortly after the Daiichi nuclear power plant catastrophe. We found that the two data sets were highly correlated, though the DOE/NNSA observations were generally higher than the Safecast measurements. We concluded that this high correlation alone makes Safecast a viable data source for detecting and monitoring radiation.
Dept. of Geography and Institute for CyberScience, Geoinformatics and Earth Observation Laboratory, The Pennsylvania State University, University Park, PA, United States; Computational Sciences and Engineering Division, Geographic Information Science and Technology Group, Oak Ridge National Laboratory, Oak Ridge, TN, United States. Electronic address: colettima@ornl.gov.
Mark
M
Coletti
Dept. of Geography and Institute for CyberScience, Geoinformatics and Earth Observation Laboratory, The Pennsylvania State University, University Park, PA, United States. Electronic address: cgh138@psu.edu.
Carolynne
C
Hultquist
Center for Social Complexity, Krasnow Institute for Advanced Study, George Mason University, Fairfax, VA, United States. Electronic address: wkennedy@gmu.edu.
William G
WG
Kennedy
Dept. of Geography and Institute for CyberScience, Geoinformatics and Earth Observation Laboratory, The Pennsylvania State University, University Park, PA, United States; Research Application Laboratory, National Center for Atmospheric Research, Boulder, CO, United States. Electronic address: cervone@psu.edu.
Guido
G
Cervone
D000401:Aircraft; D062406:Fukushima Nuclear Accident; D006077:Government Agencies; D020407:Internet; D007564:Japan; D011834:Radiation Monitoring / Q000379:methods*; D014481:United States
Data validation; Fukushima Daiichi; Safecast; Volunteered geographic information