some parameter in prediction.py

[lee-liew]

Hi, bro, I have some questions about some parameter in "prediction.py " at advanced_scripts folder. From line 188~197:

timeGridE = SOG_E
constE = 70 / np.power(timeGridE, 3)
timeGridE80 = np.cbrt(80 / constE)
timeGridE60 = np.cbrt(60 / constE)
timeGridE = timeGridE[AOI[2]:AOI[3], AOI[0]:AOI[1]]
timeGridE80 = timeGridE80[AOI[2]:AOI[3], AOI[0]:AOI[1]]
timeGridE60 = timeGridE60[AOI[2]:AOI[3], AOI[0]:AOI[1]]
timeGridE = np.where(timeGridE < 0, 10000, (kmGridEW * 1000) / (timeGridE * 30.87))
timeGridE80 = np.where(timeGridE80 < 0, 10000, (kmGridEW * 1000) / (timeGridE80 * 30.87))
timeGridE60 = np.where(timeGridE60 < 0, 10000, (kmGridEW * 1000) / (timeGridE60 * 30.87))

Q1. What is 70 in "constE = 70 / np.power(timeGridE, 3) ", 80 in "timeGridE80 = np.cbrt(80 / constE)", and 60 in "timeGridE60 = np.cbrt(60 / constE)"?

Q2. What is 30.87 in "timeGridE = np.where(timeGridE < 0, 10000, (kmGridEW * 1000) / (timeGridE * 30.87))"?

Thanks a lot!