Support for Multi-band rasters

[ozak]

Seems it would be useful to handle multi-band rasters. May need first to move to rasterio and then a rethink on how to handle and change functions accordingly. Should resolve issues #26, #39, #54.

[snowman2]

I wonder if rioxarray might help with the transition?

https://github.com/corteva/rioxarray

[ozak]

Looks like an interesting project. Seems there is some overlap between what this package does and that one.

[snowman2]

They do attempt to solve similar problems. I was thinking it might simplify the transition to use rasterio. Also, it uses Xarray, which I also thought might be useful for solving the multi-band/multi-subdataset support.

[pessimo]

just found that georasters.from_file gave the wrong meta info when handling multi-band raster file, maybe currently we should raise exception?

in my case, read a 3 bands(rgb) raster file gave wrong xmin, xmax, so shape of raster file was (3, 256) instead of (3, 256, 256)

[ozak]

Indeed that is a major issue right now. No multilayer support. I do not think it should be difficult to add a flag to select band for importing once the move to rasterio has been done. I just have not had the time. Does anyone want to try to tackle this? Help would be greatly appreciated.

[volkanyazici]

In my study, I work with 12 bands. When I tried to read tif file as pandas dataframe with the code df = data.to_pandas() I get an error like this ValueError: Must pass 2-d input. shape=(12, 1257, 1065). And then I found this issue. So, can you tell if there is a multi-band support yet? Thanks.

[ozak]

Sorry not yet. I haven't had the time to do this. It may need quite a bit of rewriting of the whole package to ensure things are being computed the right way. It's one of the issues where help would be more than welcome.

[volkanyazici]

I would like to point out that since I am new to python, I am not qualified to edit the codes. I hope someone will spare their help to improve this beautiful package.

[shelleyg-bit]

I would love to work on this feature. I have been looking to contribute to open source, this seems just the right amount of challenge. I came here because I wanted to analyze a multi-band raster using pandas.

[ozak]

Thanks @shelleyg-bit That would be great! I think the way to tackle this will need us to first move the import to rasterio which will allow importing one or more bands. Then I think it's just deciding whether to create a new MB ie multi-band class or change the code to ensure that things works fine. My own preference would be to create a new MB class. Do you want to start a new branch for the rasterio changes first. Then we can try this part?