Assertion: glacier's surface | /r/HasProperty | every 1 to 2 days
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Source sentences:
text: Terra MODIS and Aqua MODIS are viewing the entire Earth’s surface every 1 to 2 days, acquiring data in 36 spectral bands, or groups of wavelengths Quickbird 0.61 m 16.5 Km x 16.5 Km at nadir Launched October 2001