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33 lines
1.0 KiB
Python
33 lines
1.0 KiB
Python
"""HDR Landsat.
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Display portions of an image with different dynamic ranges.
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The land areas are displayed normally, but the water areas
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are stretched to show more details.
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"""
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import datetime
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import ee
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import ee.mapclient
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ee.Initialize()
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ee.mapclient.centerMap(-95.738, 18.453, 9)
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# Filter the LE7 collection to a single date.
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collection = (ee.ImageCollection('LANDSAT/LE07/C01/T1')
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.filterDate(datetime.datetime(2002, 11, 8),
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datetime.datetime(2002, 11, 9)))
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image = collection.mosaic().select('B3', 'B2', 'B1')
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# Display the image normally.
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ee.mapclient.addToMap(image, {'gain': '1.6, 1.4, 1.1'}, 'Land')
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# Add and stretch the water. Once where the elevation is masked,
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# and again where the elevation is zero.
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elev = ee.Image('CGIAR/SRTM90_V4')
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mask1 = elev.mask().eq(0).And(image.mask())
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mask2 = elev.eq(0).And(image.mask())
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ee.mapclient.addToMap(
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image.mask(mask1), {'gain': 6.0, 'bias': -200}, 'Water: Masked')
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ee.mapclient.addToMap(
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image.mask(mask2), {'gain': 6.0, 'bias': -200}, 'Water: Elev 0')
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