I am new with both Sentinel data and this forum. So, apologies for a trivial question.
I want to process Sentinel1A data and I know that this is 12-day temporal resolution (revisiting). However, when I checked my experiment area, I found that no data (i.e., a pair of consecutive images) has 12-day interval. They are at least 24 days in separation and even longer.
Can anyone describe me what caused this? It is in urban area.
Thanks for your advice. I had a look on Sentinel-1 Constellation Observation Scenario map. I am searching data in Hanoi area of Vietnam over a 4 year period, from 2014 until now. It is certainly not in Europe, so I believe that it should be 12-day revisits area. However, there is not any pair with 12-day separation. When searching on another area, that is about 200 km far away from Hanoi, most of available images are in 12-day interval.
So just for S1-A there are acquisitions every 12 days while including S1-B this is reduced to 6 days for part of the month. I notice that Hanoi is also imaged for relative orbit 91 (descending pass) on:
I am working with Sentinel -1 data for Tolima region in Colombia ( 75 °00 w , 3°55’ n). I found that there are 2 months of gap information in 2018. the atached figure was created in google earth engine, but I also checked the available information in copernicus repository, finding the same.
So, I would like to know which could be the reason for this lack of data.