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Steps

1. use earth engine to export a geotiff of the median modis in higher resolution than you need. https://code.earthengine.google.com/5ce94569601c58a14bcaf28c1852e006
2. download them
3. build a vrt file

gdalbuildvrt g.vrt greenland-modis-median-julyaugust-100m-*.tif

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import numpy as np
from matplotlib import colors
import matplotlib.pyplot as plt


def lch_to_lab(LCh):
    a = np.cos(LCh[2] * np.pi / 180) * LCh[1]
    b = np.sin(LCh[2] * np.pi / 180) * LCh[1]
    return np.array((LCh[0], a, b))

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import requests
_host= 'https://eu5.fusionsolar.huawei.com'
_username = 'test'
_password = 'test'

url = _host + '/thirdData/login'
headers = {
    'accept': 'application/json',
}