Hi!
I used SNAP v7.0 and v8.0 to process the Sentinel1 TOPS datasets. I found that, the file name of the auto downloaded precise orbit file starts with the SAR data acquisition date
SAR data: S1A_IW_SLC__1SDV_20181212T231413_20181212T231440_024999_02C1A6_0331.zip
Orbit data:S1A_OPER_AUX_POEORB_OPOD_20190102T120806_V20181212T225942_20181214T005942.EOF.zip
I am confused now. Should not I use the orbit file one day before the SAR data acquisition date?
S1A_OPER_AUX_POEORB_OPOD_20190101T120738_V20181211T225942_20181213T005942.EOF.zip
I hope you can help me to figure out this problem.
Thank you very much.
Dingfeng Duan