2. Methods
SNPP VIIRS DNB image data were downloaded from NOAA Comprehensive Large Array Data
Stewardship System (CLASS) (Table 1), http://www.class.ngdc.noaa.gov/. The periods were
consistent with the reported data from fisherman for each species. DMSP/OLS data was provided
by Satellite Image Data Base (SIDaB) from Agriculture, Forestry and Fisheries Research
Information Technology Center, Japan. http://rms1.agsearch.agropedia.affrc.go.jp/menu_ja.html.
SIDaB obtains DMSP data from NGDC. The analysis was done on low cloud cover VIIRS and
OLS data collected in 2013 and 2014. In addition, we conducted a comparison of vessel
detections from OLS and VIIRS on data collected during the same night (January 29, 2014).
We used reported location data to verify the DNB vessel detection results (Table 1). For Neon
flying squid, ten vessels from Hachinohe, Japan provided location data. For Japanese common
squid, two Vessel monitoring system (VMS) onboard datasets were used. For Pacific saury we
have location data recorded from a single vessel.
All of the DNB data and location data were processed with the ENVI 5.1, and ArcGIS 10.0
software.