I am working on my master thesis and want to quantify the NDWI using Landsat images.
After estimating the water surface area for my area of interest, the areas obtained from Landsat 7 overestimated the actual area due to the inclusion of gaps in my calculation. Now, I need to fill the gaps.
I am using Landsat 7 collection 2 level 2. However, in Landsat 7 collection 1 level 2, the filling can be made by using gap mask folder when downloading the data which is not the case in collection 2.
Thank you in advance,
Awad M. Ali
I figured out the answer myself. So, I will answer it and maybe someone can benefit from it.
You can just directly fill the gaps using QGIS:
Raster --> Analysis --> Fill nodata (No need to use any other file for masking)
Good luck!
SLC-off data refers to all Landsat 7 images collected after May 31, 2003. I recommend you use ERDAS IMAGINE software to fix the Scan Line error. It's a bit of time lengthy process but gives almost accurate results. I used this software previously on my undergrad thesis work.
Good luck!
Md. Atik Fayshal thank you so much for sharing these information. However, how can I assess its accuracy? and what do you think of QGIS accuracy in that?
Thanks.
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