I have time series data like this:

| date | longitude | latitude |
| --- | --- | --- |
| 01/01/2010 | -5.42766 | 107.5784 |
| 02/01/2010 | -6.42728 | 104.5245 |
| 07/01/2010 | -7.42702 | 105.5816 |
| 14/01/2010 | -4.42728 | 99.57834 |
| 17/01/2010 | -6.41523 | 103.5562 |
| ... | ... | ... |
| 31/12/2013 | -4.42728 | 99.57834 |

This is location data (longitude and latitude).
I want to change the data from daily to weekly, something like this:

| week | longitude | latitude |
| --- | --- | --- |
| week 1 | ... | ... |
| week 2 | ... | ... |
| week 3 | ... | ... |
| week 4 | ... | ... |

how to transform the data? since calculating the mean of the data doesn't make sense because it is location data.