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Browse files- utils/NBR_calculations.py +0 -130
- utils/__init__.py +0 -0
utils/NBR_calculations.py
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import ee
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''' 0 Good quality fire
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1 Good quality fire-free land
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2 Invalid due to opaque cloud
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3 Invalid due to surface type or sunglint or LZA threshold exceeded or off earth or missing input data
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4 Invalid due to bad input data
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5 Invalid due to algorithm failure'''
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# Bit-masking
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BitMask_0 = 1 << 0
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BitMask_1 = 1 << 1
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BitMask_2 = 1 << 2
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BitMask_3 = 1 << 3
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BitMask_4 = 1 << 4
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BitMask_5 = 1 << 5
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BitMask_6 = 1 << 6
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BitMask_7 = 1 << 7
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BitMask_8 = 1 << 8
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BitMask_9 = 1 << 9
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def GcalcNBR (goesImg, aoi):
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#day = ee.Date(eachImg.get('system:time_start')).get('day','America/Los_Angeles')
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fireMode = goesImg.select('fireMode')
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fireMin = goesImg.select('fireMin')
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CMI_QF3 = goesImg.select('DQF_C03').int()
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CMI_QF6 = goesImg.select('DQF_C06').int()
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# To include active fire pixels - fireMin.lt(2)\ for next line
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QF_Mask = (fireMin.eq(1)\
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.Or(fireMin.gt(3)))\
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.And(CMI_QF3.lt(2))\
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.And(CMI_QF6.lt(2))\
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.rename('QFmask');
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GOESm = goesImg.select(['CMI_C03','CMI_C06']).updateMask(QF_Mask)
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NBR = GOESm.normalizedDifference(['CMI_C03', 'CMI_C06']).toFloat().rename('NBR')
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return goesImg.addBands([NBR,QF_Mask])
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def GcalcCCsingle (goesImg):
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fireDQF = goesImg.select('DQF').int()
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CMI_QF3 = goesImg.select('DQF_C03').int()
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CMI_QF6 = goesImg.select('DQF_C06').int()
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#Right now, cloud mask is excluding clouds and water; active fire, bad data and fire free are unmasked. NBR mask exlcudes fire
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F_Mask = fireDQF.eq(0)
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C_Mask = (fireDQF.lt(2).Or(fireDQF.gt(2))).rename('C_Mask')
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#.And(CMI_QF3.lt(2)).And(CMI_QF6.lt(2)).rename('C_Mask')
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QF_Mask = (fireDQF.eq(1).Or(fireDQF.gt(3)))\
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.And(CMI_QF3.lt(2)).And(CMI_QF6.lt(2)).rename('QFmask')
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GOESmasked = goesImg.select(['CMI_C03','CMI_C06']).updateMask(QF_Mask)
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NBRmasked = GOESmasked.normalizedDifference(['CMI_C03', 'CMI_C06']).toFloat().rename('NBR')
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cloudMasked = goesImg.select('CMI_C03').updateMask(C_Mask).toFloat().rename('CC')
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fireMasked = goesImg.select('CMI_C03').updateMask(F_Mask).toFloat().rename('FC')
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return goesImg.addBands([NBRmasked,cloudMasked, fireMasked,QF_Mask,C_Mask])
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'''Parameter Array Name Value Bit(s) = Value
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Sun Glint QF1 Surface Reflectance None 6-7 = 00
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Low Sun Mask QF1 Surface Reflectance High 5 = 0
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Day/Night QF1 Surface Reflectance Day 4 =0
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Cloud Detection QF1 Surface Reflectance Confident Clear 2-3 = 00 or Problably Clear 2-3 = 01
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Cloud Mask Quality QF1 Surface Reflectance High or Medium 0-1 = 10 or 11
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Snow/Ice QF2 Surface Reflectance No Snow or Ice 5 = 0
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Cloud Shadow QF2 Surface Reflectance No Cloud Shadow 3 = 0
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LandWater QF2 Surface Reflectance Land, Snow, Arctic, Antarctic or Greenland, Desert 0-2 = 011, 100, 101, 110, 111
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Thin Cirrus Flag QF7 Surface Reflectance No Thin Cirrus 4 = 0
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Aerosol Quantity QF7 Surface Reflectance Climatology, Low or Medium 2-3 = 00, 01 or 10
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Adjacent to Cloud QF7 Surface Reflectance Not Adjacent to Cloud 1 = 0'''
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def VcalcNBR (VIIRSimg):
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QF1 = VIIRSimg.select('QF1').int()
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QF2 = VIIRSimg.select('QF2').int()
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QF7 = VIIRSimg.select('QF7').int()
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QF_Mask = (QF1.bitwiseAnd(BitMask_3).eq(0)).And\
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((QF2.bitwiseAnd(BitMask_2).eq(4)).Or((QF2.bitwiseAnd(BitMask_1).eq(0)))).And\
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(QF2.bitwiseAnd(BitMask_5).eq(0)).rename('QFmask');
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VIIRSm = VIIRSimg.select(['I2','M11']).updateMask(QF_Mask);
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NBR = VIIRSm.normalizedDifference(['I2','M11']).toFloat().rename('NBR')
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return VIIRSimg.addBands(NBR).addBands(QF_Mask)#.set('avgNBR', avgNBR)
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''' Bit 1: Dilated Cloud
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Bit 2: Cirrus (high confidence)
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Bit 3: Cloud
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Bit 4: Cloud Shadow
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Bit 5: Snow
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Bit 6: Clear (0: Cloud or Dilated Cloud bits are set, 1: Cloud and Dilated Cloud bits are not set)
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Bit 7: Water
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Bits 8-9: Cloud Confidence (0: None, 1: Low, 2: Medium, 3: High)
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Bits 10-11: Cloud Shadow Confidence (0: None, 1: Low, 2: Medium, 3: High)
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Bits 12-13: Snow/Ice Confidence (0: None, 1: Low, 2: Medium, 3: High)
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Bits 14-15: Cirrus Confidence (0: None, 1: Low, 2: Medium, 3: High)'''
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def LcalcNBR (LSimg):
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QApixel = LSimg.select('QA_PIXEL').int()
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QF_Mask =(QApixel.bitwiseAnd(BitMask_3).eq(0)).And\
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(QApixel.bitwiseAnd(BitMask_5).eq(0)).And\
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(QApixel.bitwiseAnd(BitMask_7).eq(0)).rename('QFmask');
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LSmasked = LSimg.select(['SR_B5','SR_B7']).updateMask(QF_Mask);
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NBR = LSmasked.normalizedDifference(['SR_B5','SR_B7']).toFloat().rename('NBR')
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return LSimg.addBands(NBR).addBands(QF_Mask)#.set('avgNBR', avgNBR)
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''' 1 Saturated or defective
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2 Dark Area Pixels
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3 Cloud Shadows
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4 Vegetation
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5 Bare Soils
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6 Water
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7 Clouds Low Probability / Unclassified
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8 Clouds Medium Probability
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9 Clouds High Probability
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10 Cirrus
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11 Snow / Ice'''
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def ScalcNBR (sentImg):
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SCL = sentImg.select('SCL');
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QF_Mask =(SCL.neq(6)).And\
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(SCL.neq(8)).And\
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(SCL.neq(9)).And\
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(SCL.neq(11))\
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.rename('QFmask');
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sentMasked = sentImg.select(['B8A','B12']).updateMask(QF_Mask); #B8 is another option- broadband NIR
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NBR = sentMasked.normalizedDifference(['B8A','B12']).toFloat().rename('NBR')
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return sentImg.addBands(NBR).addBands(QF_Mask).addBands(SCL)#.set('avgNBR', avgNBR)
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utils/__init__.py
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File without changes
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