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They are coma separated csv files. The coordinates are polar coordinates, and is a matrix of 36 x 36. The north pole is at coordinates (17,17), and the radius is 18, which corresponds to 2.5 degrees that go from 90 degrees north to 45 degrees. The greenwich meridian is the positive y axis. The content of this file is the predicted ROTI. 

The time in the file name is the epoch when the prediction is made. For the predicted time of ROTI maps, please add this time epoch by the predicted horizon (e.g., 60 min). 

 
Here is a function (in python) to calculate the coordinates:
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x, y = np.arange(-18,18) , np.arange(18,-18, -1) 
xxg, yyg = np.meshgrid(x,y)
 
lon = -np.rad2deg(np.arctan2(xxg, yyg ))
lat = (90.-np.sqrt(xxg**2+yyg**2)*2.5)  
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The lat and lon can be found in the files: predicted_roti_lat.csv and predicted_roti_lon.csv