Without using the zip file with metadata, is there any way to use just the Geotiff for flood detection? (using Snappy or any other API) Any insight will be highly appreciated.
Yes, It is possible using Snappy API. You can also use the Graph Processing tool (GPT) of the SNAP software for the same job. However, some additional analysis has to be done using python as a continuous processing chain to delineate flood.
You can refer to [1] and [2] for more details.
- In [1], the SAR data preparation for flood extraction along with its automation using Graph Builder, GPT tool, and Snappy API of the SNAP software is discussed in detail.
- In [2], a new algorithm has been developed for delineating floods using the GPT tool along with some additional analysis as a continuous processing chain to find flood inundated areas in the given SAR image. Similarly, you can employ Snappy API instead of a GPT tool followed by its thematic analysis.
Moreover, you can also visit STEP Forum (https://forum.step.esa.int/ ) if you face any issue while working with the Snappy API.
Thanks! I hope it helps you.
References:
[1] Article Sentinel-1 SAR Data Preparation for Extraction of Flood Foot...
[2] Article Development of an Automated Tool for Delineation of Flood Fo...
I am not sure if SAR interferometry can be used in flood detection. Moreover, zipped files are preferable because they contain all the metadata and ancillary files which can be helpful in data processing compared to individual TIFF files. However, you can go for flood detection if the TIFF files are having values in terms of SAR backscatter and can be used to compute backscatter coefficient followed by decibel conversion. I suggest you to use Google Earth Engine with open source code available for flood detection.
Hello Hasara Maithree De Silva,
If you are not interested in working with the raw ZIP file of the Sentinel data, open the image in the SNAP software and save it in GeoTIFF format again. By doing so, you will be able to generate a new GeoTIFF file with its metadata appended to it. Later you can use the same single GeoTIFF file for your analysis.
I have already added an answer previously on how to use the Snappy API, Graph Builder and GPT tool along with some references for flood detection.
I hope it helps. Thanks!
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