I would like to ask if it is possible to split image - Sentinel 1 - to multiple small parts by vector grid. My task is water detection.
I detect water by aplying tresholding. The problem is I would like to do this automated water detection for larger area and problem is with histogram. If area is too big It is hard to apply tresholding because there is not enough water pixels to “affect” histogram. Histogram from big area do not look like histogram below so I do not know how to find local minimum.
I want to split image to small parts for better results by grid or use some other process to do that. Mainly I want to get image, split it to equal small parts and process each part alone than put it together again.
Can I do that in SNAP ? If not, could you tell me what should I do ? Do you have better solution for my problem ? Thanks.
I’m not sure if it makes sense thematically, cause I’m not familiar with the radar matter, but technically you can do several subset of your product. This can be easily done if they always have the same size. in this case you can always use the same pixel coordinates.
The you can do your analysis. Merge the results is also doable by using the Mosaic operator.
Dear zubro,
I too work on the same research problem. I wonder if you were able to successfully done your analysis, please let me the know the procedure. How did you implement an operator?
I have used TileWriter modul in SNAP. It can split your imagery in multiple parts. You can split by defining number of tiles - 8,16,32…or by defining height and weight of the parts you want to get.
Hi Zubro! I used the Tilewriter module in the same way as you have done to create 4 subsets out of one Sentinel 1 image. But when I run it, it gets stuck in an endless loop. Even after 15 hours, the script does not finish the task. Could you help me in identifying the source of problem?
I will look at operator and I also have thought about applying subsets. Thanks