How did you pre-process the image bands?

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Hello! I am a beginner in the field of deep learning and landslide detection. I am interested in the way you re-scale the image data. For example, the slope may range from 0-90 degrees, and the elevation may range from 0-4000 meters. Besides, the optical bands and DEM data also have various ranges. So how did you normalize these bands? Thank you!