import rasterio
import numpy as np
mars = rasterio.open('Mars_MGS_MOLA_DEM_mosaic_global_463m.tif')
mars = mars.read()
print(mars.shape)
print(np.amin(mars[0]))
print(np.amax(mars[0]))
print(np.amax(mars[0]) + abs(np.amin(mars[0])))(1, 23040, 46080) -8201 21241 29442