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Prepare batches of data for training machine learning solar electricity nowcasting data

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## Detailed Description Each example should include at least one PV system. These PV systems don't have to be in the center of the satellite imagery. This way, we get...

enhancement

## Detailed Description When we create batches which are _just_ satellite imagery (from the entire extent of the imagery) then `SatelliteDataSource.get_locations` will need to be implemented. ## Possible Implementation Should...

enhancement

## Detailed Description Good to have option to save gsp data in s3. Currently it gets save location. This means we would know all the different servies are using the...

enhancement

## Detailed Description It used to be necessary to do this to load NetCDF quickly from a cloud storage bucket: ```python with fsspec.open(filename, mode="rb") as file: file_bytes = file.read() with...

enhancement
good first issue
refactoring

## Detailed Description Use the random number generator to set a seed, so tests are repeatable. Using numpy's newish Generator class, so this function gets its own RNG which is...

enhancement

## Detailed Description Ideally, each variable should only have a default value defined once in the code. ## Context At the moment, defaults (for filenames and other parameters) are scattered...

enhancement
good first issue
refactoring

# Pull Request ## Description Rename time_resolution_minutes to sample_period_minutes to make the code consistent Fixes #584 ## Checklist: - [ x] My code follows [OCF's coding style guidelines](https://github.com/openclimatefix/nowcasting/blob/main/coding_style.md) - [...

refactoring

## Detailed Description Currently the nwp filename is 'nwp_zarr_path' but it in fact can be a 'netcdf' file once this PR (#581) has happened The pydantic model file is [here](https://github.com/openclimatefix/nowcasting_dataset/blob/main/nowcasting_dataset/config/model.py#L294)...

good first issue
size-small
refactoring

## Detailed Description `model.py` uses `time_resolution_minutes`. Elsewhere in the code this same concept is called `sample_period_minutes`. ## Context Good to be consistent throughout the code.

enhancement
good first issue
refactoring

## Detailed Description ESO have provided us with a list of datetimes when their national PV forecast was particularly bad. We should modify `nowcasting_dataset` to allow us to manually specify...

enhancement