Cannot construct DataBuffer (S1 Calibration)

hi there can you help me I couldn’t go on because I am getting this error box all the time

this is memory related, SNAP needs more RAM to compute this task. How much is installed in your computer?

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the RAM is 4GB

Unfortunately, that’s not enough.

8Go is the bare minimum and I recommend rather 16Go.

I hope you’ll find better equipment.


Thank you for the information but can you tell me that is SNAP toolbox is the only way to preprocess sentinel-1 image because we can use ArcGIS to radiometrically calibrate for Landsat image

There are alternatives to SNAP, some are free and others are commercial. However, note that Sentinel-1 images are very large. Using other software will lead to problems of the same type. You can work with very small subset if needed

I want to say thank you so much for all of you now I have gat 16 GB RAM and it is working properly


i have gat back scattering dB and i want to select some pixels to take ground truth measurement for soil moisture but i want to know that do i need georeferencing the image

once you have gocoded your image (perform range doppler terrain correction as a last step), you can use the pin manager to extract the backscatter intensity of a pixel together with its lat/lon coordinates.

The pin manager is explaned here:

thank you so much for the help you don’t know how much you are helping me

Is there any way to import my study area in snap


hi there when I download an image of sentinel-1 the date on it says
Sensing start: 2019-07-22T03:17:51.550Z
Sensing stop: 2019-07-22T03:18:16.548Z but how can I know it is in taken in the day or night time (AM?PM)

time is always given in UTC:

okay. is it possible to know on the image the sensing time is in the day or night time (AM or PM) if there is some way to identify thank you.

I don’t think there is a metadata tag for it, sorry.
May I ask why does it matter to you if the image is acquired at day or at night?

because I am going to collect soil moisture samples and I have to take the measurement exactly at the time Sentinel-1 overpass my study area which is found in Ethiopia and the time difference of Ethiopia from UTC is +3 it is found in Eastern Africa Time zone (EAT) but am not clear that the image is taken in UTC AM or UTC PM

UTC is actually a 24 hour scheme and doesn’t make use of AM or PM

You can use this converter to see which EAT corresponds to which UTC

Hello. I have got a problem of getting an image of Sentinel -1 the last image which was taken in my study was on 03/08/2019 Since the revisit time of this satellite is 12 days I should have an image in 1408/2019 but there is no image after 03/08/2019 does some one has the clue why this is happning?

you can check for changes in the acquisition sements here: