The GOES-10 Channel 1 (Visible) 1KM Sectored Data in Hierarchical Data Format (HDF) is one of several satellite data sets collected as part of the Dynamics and Chemistry of Marine Stratocumulus Phase II: Entrainment Studies (DYCOMS-II) project by the National Center For Atmospheric Research/Earth Observing Laboratory (NCAR/EOL). NCAR/EOL utilized its SeaSpace system to retrieve data from the Geostationary Operational Environmental Satellite 10 (GOES-10) and developed sectors over the DYCOMS-II region. This data set consists of the sectored 1-km data from Channel 1 (visible; 0.65um) of the GOES-10 satellite. The products cover the period from 1 - 30 July 2001 and cover the DYCOMS-II sector (27-37N and 114-126W). During the times the NSF/NCAR C-130 aircraft was in flight (see the web page http://catalog.eol.ucar.edu/dycoms/missions/ for flight times) the data are typically available every 15 minutes, but rapid scan imagery are also often available (most often during the afternoon and evening hours). For the times that the NSF/NCAR C-130 was not in flight data are available every three hours (00, 03, 06, ... UTC). All images are in HDF format. A brief description of HDF is given in Section 3.1 of the readme.