Stefan, in processing Collection-1 Landsat 8 products, `i.landsat8.qc` deserves an update [0][1]. Please note that Pre-Collection products are removed from EarthExplorer [2][3].
See: [0] https://landsat.usgs.gov/sites/default/files/documents/landsat_QA_tools_userguide.pdf [1] https://landsat.usgs.gov/collectionqualityband [2] https://landsat.usgs.gov/september-1-2017-countdown-landsat-pre-collection-datasets-removal [3] https://landsat.usgs.gov/oct-3-2017-pre-collection-dataset-removal-prompts-ee-changes Below, bits and descriptions transferred in python dictionaries, blindly following the script's current structure (kept "old" and "new" for comparison). I would like your view on this, or anyone else's who is interested. What do you think of: - introducing a `collection=` option in the module and make it treat both, Pre-Collection and Collection-1 products? - removing Pre-collection QA bits altogether? Nikos -- Hier Pre-Collection und Collection-1 zusammen: """ Pre-Collection populated bits: 0 Designated Fill 1 Dropped Frame 2 Terrain Occlusion 3 Reserved (not currently used) 4-5 Water Confidence 6-7 Reserved for cloud shaddow 8-9 Vegetation confidence 10-11 Snow/Ice confidence 12-13 Cirrus confidence 14-15 Cloud confidence """ # Define bit length (single or double bits) -- Pre-Collection bl = {'designated_fill': 1, 'dropped_frame': 1, 'terrain_occlusion': 1, # 'reserved': 1, 'water': 2, 'cloud_shadow': 2, 'vegetation': 2, 'snow_ice': 2, 'cirrus': 2, 'cloud': 2} # Define bit position start -- Pre-Collection bps = { 'designated_fill': 0, 'dropped_frame': 1, 'terrain_occlusion': 2, # 'reserved': 3, 'water': 4, 'cloud_shadow': 6, 'vegetation': 8, 'snow_ice': 10, 'cirrus': 12, 'cloud': 14} """ Collection-1 populated bits 0 Designated Fill 1 Terrain Occlusion 2-3 Radiometric Saturation 4 Cloud 5-6 Cloud Confidence 7-8 Cloud Shadow Confidence 9-10 Snow/Ice confidence 11-12 Cirrus confidence 13 14 15 """ # Define bit length (single or double bits) -- Collection-1 bit_length = {'designated_fill': 1, 'terrain_occlusion': 1, 'radiometric_saturation': 2, 'cloud': 1, 'cloud_confidence': 2, 'cloud_shadow_confidence': 2, 'snow_ice_confidence': 2, 'cirrus_confidence': 2, # 'reserved': 1, # 'reserved': 1, # 'reserved': 1} # Define bit position start -- Collection-1 bit_position_start = { 'designated_fill': 0, 'terrain_occlusion': 1, 'radiometric_saturation': 2, 'cloud': 4, 'cloud_confidence': 5, 'cloud_shadow_confidence': 7, 'snow_ice_confidence': 9, 'cirrus_confidence': 11, # 'reserved': 13, # 'reserved': 14, # 'reserved': 15} """ Pre-Collection For the single bits (0, 1, 2, and 3): 0 = No, this condition does not exist 1 = Yes, this condition exists. """ """ Collection-1 For the single bits (0, 1, and 4): 0 = "No" = This condition does not exist 1 = "Yes" = This condition exists """ # Define single bits dictionary -- Identical for Pre- and C1 single_bits = {'No': '0', 'Yes': '1'} """ Collection-1 For radiometric saturation bits (2-3), read from left to right, represent how many bands contain saturation: 00 - No bands contain saturation 01 - 1-2 bands contain saturation 10 - 3-4 bands contain saturation 11 - 5 or more bands contain saturation """ radiometric_saturation = {'No bands contain saturation': '00', '1-2 bands contain saturation': '01', '3-4 bands contain saturation': '10', '5 or more bands contain saturation': '11'} """ Pre-Collection The double bits (4-5, 6-7, 8-9, 10-11, 12-13, and 14-15), read from left to right, represent levels of confidence that a condition exists: 00 = 'Not Determined' = Algorithm did not determine the status of this condition 01 = 'No' = Algorithm has low to no confidence that this condition exists (0-33 percent confidence) 10 = 'Maybe' = Algorithm has medium confidence that this condition exists (34-66 percent confidence) 11 = 'Yes' = Algorithm has high confidence that this condition exists (67-100 percent confidence). """ # Define double bits dictionary -- Pre-Collection double_bits = {'Not Determined': '00', 'No': '01', 'Maybe': '10', 'Yes': '11'} """ Collection-1 For the remaining double bits (5-6, 7-8, 9-10, 11-12), read from left to right, represent levels of confidence that a condition exists: 00 = "Not Determined" = Algorithm did not determine the status of this condition / "No" = This condition does not exist 01 = "Low" = Algorithm has low to no confidence that this condition exists (0-33 percent confidence) 10 = "Medium" = Algorithm has medium confidence that this condition exists (34-66 percent confidence) 11 = "High" = Algorithm has high confidence that this condition exists (67-100 percent confidence """ # Define double bits dictionary -- Colletion-1 double_bits_c1 = {'Not Determined': '00', 'Low': '01', 'Medium': '10', 'High': '11'}
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