March 17, 2017, 2:38pm
yes. Multi-looking is not necessarily required but improves your data regarding the presence of speckle.
You can convert your data by right-clicking on the bands > “Convert to db”
This generates a virtual raster. Make it physical by right-clicking “convert band” and save your product.
Thank you ABraun for that fast answer.
I’m comming from the interferometry field…and was kind of lost in this topic.
Thank you and have a nice weekend.
March 17, 2017, 2:50pm
Good luck. You can share your results in here with screenshots and we can maybe help again if you are stuck somewhere.
I am having my training data sets as point file. Is it possible to classify S1 data in SNAP using points?
March 29, 2017, 5:19pm
I don’t think so. In any case for SAR data using a single pixel would be bad.
If I have the polygons, is it possible to do supervised classification in S1 images with SNAP?
April 9, 2017, 6:06am
yes. Open your SAR image, menuy > import > other > shapefile
Then use the polygons as training vectors in the classification modules by selecting the column that has the class information.
How do you execute a Support Vector Machines classification to map rice areas in Sentinel-1 toolbox? thanks before
October 12, 2017, 10:14am
SVM is currently not implemented in SNAP
Thanks for the reply ABraun. Do you have any suggestions on what classification method i can use to map rice areas that can be achieved with SNAP Sentinel-1 toolbox? My data is IW GRDH by the way
October 12, 2017, 10:58am
the random forest classifier is quite good if you have data of different scales. But it needs more than just 2 rasters.
For the case you only have VV and VH you can use the KD Tree KNN classifier.
Okay Abraun how do you execute a KD Tree KNN classifier on SNAP? I’ve tried looking at
http://step.esa.int/main/doc/tutorials/ and the ESA training courses but couldn’t find what was needed. Sorry for the many questions.
October 12, 2017, 11:38am
collect sample areas and use them for training.
Please see here:
I'm a student of geodesy and geomatics and I'm supposed to do thesis on classification (supervised and unsupervised) of area near Novi Sad, Serbia. Since I'm new to s2tbx I'm having some problems. I already tried to do the unsupervised classification but the process didn't finish even though it worked all night. I already tried to find some tutorials and user-guides that could help me, but I didn't find anything usefull. So I was wondering if there is anyone who could help me …
Thanks a lot ABraun one last question how do you digitize polygons in SNAP? Is it the same as in Arcmap? how about points?
October 12, 2017, 1:09pm
points are called pins in SNAP
you can digitize them with this toolbar, it is quite intuitive
March 26, 2018, 7:25am
can the enmap be used on sentinel-1 data classification?
I have version 6 but I did not find it and I did not know about version 7 but it seems it is not implemented there. Thanks for answer.