Explore and resolve missing data
vc1492a opened this issue · 4 comments
When plotting the dStec/dt values through all five days, i becomes clear that there are large chunks of time in which there is data is missing from the dataset for the satellites G04, G07, G08, G10, G13, G20, and G23.
This can be very problematic when it comes to training predictive models, especially in deep learning (which we plan on using). We should explore whether we can obtain the data for the time periods missing from our current dataset. If we are unable to retrieve that data, this will provide complex challenges when it comes to modeling the data.
@MichelaRavanelli do you have any thoughts as to why we may be missing data from some time periods between one day and the next? If this is something we can resolve, that would be great! If not, no big deal but we will have to adjust our modeling approach as a result.
It is normal, since a GPS satellite has an orbital period of one-half a sidereal day, so it takes 11 hours and 58 minutes for the satellite to pass over the same locations every day.
Got it! I had a hunch that may be the case, but wanted to double check with you first. I'll close this issue.